[appengine-java] Max Ross - Truth about joins

[Sudhir Ramanandi]

Alias does not get initialized..

@Entity
public class Foo {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Long id;

@Basic
public Key bar;

@OneToOne(fetch = FetchType.LAZY)
@Column(name = "bar", insertable = false, updatable = false)
public Bar barAlias;
}

@Entity
public class Bar {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
public Key key;

@Basic
public String name;
}

public class UnOwnedRelationshipTest extends BaseDataStoreTest {

public void testRelation() throws EntityNotFoundException {

Bar bar = new Bar();
beginTx();
getEntityManager().persist(bar);
commitTx();

beginTx();
Foo pojo = new Foo();
pojo.bar = bar.key;
getEntityManager().persist(pojo);
commitTx();

pojo = getEntityManager().find(Foo.class, pojo.id);
com.google.appengine.api.datastore.Entity e = DatastoreServiceFactory
.getDatastoreService().get(KeyFactory.createKey("Foo", pojo.id));
assertTrue(e.hasProperty("bar"));

//this fails
assertNotNull(pojo.barAlias);

}
}

The test fails, alias is not initialized..
It does not work even when I use getters/setters to access alias, Neither it
works for @oneToMany as you explained in example.

I use GAE SDK 1.3.2

When using joins,  From Foo result returned, can I do
foor.getBarAlias().getName() !??
-- 
Sudhir Ramanandi
http://www.ramanandi.org

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Re: [appengine-java] Re: SimpleDS 1.0_RC1 is out

[Nacho Coloma]

> Just one question: does SimpleDS support query caching too? I've some
> very popular queries and want to cache their results in a 2nd level
> cache (not only its entities)
>
>
Not yet, but this is also my case so it is in the roadmap for the next
version (a couple of months ahead).

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[appengine-java] Re: 500 Error Caused by: java.lang.NoSuchMethodException: org.codehaus.groovy.runtime.dgm$692.()

[Daisy]

A few minutes after I posted the previous message, the app started to
work.  But that is a testing app, and the real one's app id is
shijinxiaochu, which still has the same problem.  Could somebody
please fix that as well?  Thanks.

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[appengine-java] Re: Paypal integration with app engine?

[Bendanpa]

What is the 3rd party cart? can you name it?

Thanks,
Benddanpa

On May 3, 11:40 pm, Aditya Rathi  wrote:
> You can integrate paypal with GAE using thrid part cart feature. I have used
> it
>
> On Tue, May 4, 2010 at 11:33 AM, Vaclav Bartacek <
>
>
>
> vaclav.barta...@spolecne.cz> wrote:
> > The only way I found and successfully use is the PayPal Button (saved
> > on the server + 'custom' attribute) + IPN mechanism (over SSL) to
> > receive transaction statuses. Other ways could not be probably
> > implemented now due to the current GAE restrictions - mainly: you
> > cannot add a new JCE provider now.
>
> > Vaclav
>
> > On May 3, 7:47 am, shamel  wrote:
> > > How  to integrate paypal with app engine??
> > >    i have got many errors when integrating this. main exceptions are
> > > org.xml.sax.SAXNotSupportedException:
> >http://xml.org/sax/features/external-general-entities
> > >         at
>
> > org.apache.xerces.framework.XMLParser.setExternalGeneralEntities(XMLParser.java:
> > > 486)
> > >         at
> > org.apache.xerces.framework.XMLParser.setFeature(XMLParser.java:
> > > 1298)
> > >         at
> > org.apache.xerces.parsers.SAXParser.setFeature(SAXParser.java:578)
> > >         at
> > > org.apache.xerces.jaxp.SAXParserImpl.setFeatures(SAXParserImpl.java:
> > > 150)
> > > ...
>
> > > please help me as fast as possible???
>
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[appengine-java] Re: Paypal integration with app engine?

[Bendanpa]

Can you explain a bit more on that?

Thanks,
Bendanpa

On May 3, 11:03 pm, Vaclav Bartacek 
wrote:
> The only way I found and successfully use is the PayPal Button (saved
> on the server + 'custom' attribute) + IPN mechanism (over SSL) to
> receive transaction statuses. Other ways could not be probably
> implemented now due to the current GAE restrictions - mainly: you
> cannot add a new JCE provider now.
>
> Vaclav
>
> On May 3, 7:47 am, shamel  wrote:
>
>
>
> > How  to integrate paypal with app engine??
> >    i have got many errors when integrating this. main exceptions are
> > org.xml.sax.SAXNotSupportedException:http://xml.org/sax/features/external-general-entities
> >         at
> > org.apache.xerces.framework.XMLParser.setExternalGeneralEntities(XMLParser.java:
> > 486)
> >         at org.apache.xerces.framework.XMLParser.setFeature(XMLParser.java:
> > 1298)
> >         at 
> > org.apache.xerces.parsers.SAXParser.setFeature(SAXParser.java:578)
> >         at
> > org.apache.xerces.jaxp.SAXParserImpl.setFeatures(SAXParserImpl.java:
> > 150)
> > ...
>
> > please help me as fast as possible???
>
> > --
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>
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Re: [appengine-java] Re: How to make BlobServlet send non-empty response?

[bimbo jones]

The way we do it(don't know if it is the best) is to use the blobstore api
to get the url to put in the form action.

on the 1st servlet you get the blobinfo and what not, then you redirect to
another servlet that can write to the form complete handler.
I'll share some code later today.


2010/5/4 Jaroslav Záruba 

> Or do you mean I should read the post data, send them to uploadUrl
> using another request I create, and then write response to the
> original one...?
> That might probably work... :P
>
> On May 4, 6:43 pm, Jaroslav Záruba  wrote:
> > Can you be more specific please?
> > (After redirecting request you can't write to its response.)
> >
> > Regards
> >   J. Záruba
> >
> > On May 4, 10:01 am, bimbo jones  wrote:
> >
> >
> >
> >
> >
> > > hi,
> >
> > > You can redirect the upload servlet to another servlet that responds.
> >
> > > 2010/5/3 Jaroslav Záruba 
> >
> > > > I'm trying to use SWFUpload for uploading images in my application
> but
> > > > either this particular component or Flash does not like empty
> > > > responses.
> > > > Is it possible somehow to get any content in the response-body from
> > > > uploadUrl?
> >
> > > > Regards
> > > >  J. Záruba
> >
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Re: [appengine-java] How to Truncate a Datastore?

[Chau Huynh]

The common advise from the group is to break into small chunks and execute
using Task Queue

http://groups.google.com/group/google-appengine-java/search?group=google-appengine-java&q=bulk+delete&qt_g=Search+this+group
You  can take look into these to find more detail.

On Tue, May 4, 2010 at 8:32 PM, OdysseyFX  wrote:

> I recently imported a bunch of data into my datastore and realized
> there was a critical flaw that makes me need to re-import.  What is
> the best way to essentially perform a truncation of the datastore?
>
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>

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[appengine-java] 500 Error Caused by: java.lang.NoSuchMethodException: org.codehaus.groovy.runtime.dgm$692.()

[Daisy]

Hi, there:

After updated to a new  version, which worked well locally, I started
to get the following Exception.  Any help will be greatly appreciated.

   1.
  05-04 10:23PM 01.436 / 500 5070ms 4160cpu_ms 0kb Mozilla/5.0
(Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/
3.6.3 (.NET CLR 3.5.30729),gzip(gfe)
  See details

  99.229.111.64 - - [04/May/2010:22:23:06 -0700] "GET / HTTP/1.1"
500 0 - "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.3)
Gecko/20100401 Firefox/3.6.3 (.NET CLR 3.5.30729),gzip(gfe)"
"0-1.latest.hoogos2010.appspot.com"

   2.
  C 05-04 10:23PM 06.460

  Uncaught exception from servlet
  java.lang.ExceptionInInitializerError
at
org.codehaus.groovy.runtime.InvokerHelper.(InvokerHelper.java:
49)
at
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.createList(ScriptBytecodeAdapter.java:
610)
at
groovyx.gaelyk.routes.RoutesFilter.(RoutesFilter.groovy:48)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:
153)
at
org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:92)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:
50)
at
org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:
662)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:
140)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:
1250)
at
org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:
517)
at
org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
at
org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:
50)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:
191)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:
168)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
123)
at
com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
243)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:5838)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:5836)
at
com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:
24)
at
com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:398)
at com.google.net.rpc.impl.Server$2.run(Server.java:852)
at
com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:
56)
at
com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:
576)
at com.google.net.rpc.impl.Server.startRpc(Server.java:807)
at com.google.net.rpc.impl.Server.processRequest(Server.java:
369)
at
com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:
442)
at
com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:
319)
at
com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:
290)
at
com.google.net.async.Connection.handleReadEvent(Connection.java:474)
at
com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:
831)
at
com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:
207)
at
com.google.net.async.EventDispatcher.loop(EventDispatcher.java:103)
at
com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:
251)
at com.google.apphosting.runtime.JavaRuntime
$RpcRunnable.run(JavaRuntime.java:404)
at java.lang.Thread.run(Unknown Source)
  Caused by: java.lang.NoSuchMethodException:
org.codehaus.groovy.runtime.dgm$692.()
at
com.google.appengine.runtime.Request.process-97a2c792a689dcfb(Request.java)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getDeclaredConstructor(Unknown Source)
at java.lang.Class.newInstance(Class.java:27)
at
org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.createMetaMethodFromClass(MetaClassRegistryImpl.java:
180)
at
org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.registerMethods(MetaClassRegistryImpl.java:
142)
at
org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.(MetaClassRegistryImpl.java:
81)
at
org.codehaus.groovy.runtime.metaclass.M

[appengine-java] URL Fetch truncates incoming response - To what size?

[Didier Durand]

Hi,

Page 
http://code.google.com/appengine/docs/java/urlfetch/usingjavanet.html#Features_of_the_Low_level_API

says: " The URL Fetch service limits the size of the data for an
outgoing request, and for an incoming response. When using the
java.net API, data larger than the limit is silently truncated"

a) Can somebody please tell what the size limit before this truncation
happens ?
b) Better even, if there a way to read this limit somewhere through
some method so that my program remains valid if current limit ever
changes ?

regards
didier

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Re: [appengine-java] Session and AppEngine

[yjun hu]

 hi, are u using java ? if yes, the object you push into session must
implements java.io.Serializable .
  you can follow this blog for more info:
http://www.hapeblog.com/blog.shtml?id=7

On Wed, May 5, 2010 at 10:54 AM, Christian Goudreau <
goudreau.christ...@gmail.com> wrote:

> Hummm I got a weird issue
>
> I added to my appengine-web.xml this line :
> true
>
> But no JSESSIONID cookie is created.
>
> Anyway Idea why ?
>
> Christian
>
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dream or truth

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[appengine-java] Session and AppEngine

[Christian Goudreau]

Hummm I got a weird issue

I added to my appengine-web.xml this line :
true

But no JSESSIONID cookie is created.

Anyway Idea why ?

Christian

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[appengine-java] Why does UserService is so slow ?

[Christian Goudreau]

All is in the title...

Any idea how to cut down that loading time the first time ?

Christian

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[appengine-java] How to fix missing jars problem?

[Peter]

Folks,

I was using App Engine 1.3.2 with Eclipse so far. Today, I decided to
use the newer one that is available. I changed the SDK version setting
in Preferences-->Google-->App Engine from 1.3.2 to 1.3.3. After doing
this, I now see 3 warnings in my project:

The App Engine SDK JAR appengine-api-labs-1.3.3.jar is missing in the
WEB-INF/lib directory
The App Engine SDK JAR appengine-jsr107cache-1.3.3.jar is missing in
the WEB-INF/lib directory
The App Engine SDK JAR appengine-api-1.0-sdk-1.3.3.jar is missing in
the WEB-INF/lib directory

Can someone please tell me how to get rid of these warnings?

Thank you in advance for your help.

Regards,
Peter

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[appengine-java] How to Truncate a Datastore?

[OdysseyFX]

I recently imported a bunch of data into my datastore and realized
there was a critical flaw that makes me need to re-import.  What is
the best way to essentially perform a truncation of the datastore?

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Re: [appengine-java] JSP code debug: Compiled JSP location in local environment

[m seleron]

Hi,

The following threads might be useful though it depends on the
operation system that you are using.

http://groups.google.com/group/google-appengine-java/browse_thread/thread/e63281b3e3d1b05/9b12a70f5172c6c1

Hope some of this helps.
thanks.

> Hi
>
> I got following error in my local enviroment of Google App Eng with
> Eclipse plugin:
> at org.apache.jsp.scoreresult_jsp._jspService(scoreresult_jsp.java:
> 161)
>
> I would like to see the code on line 161 of compiled scoreresult.jsp
> file. But I can't find out the location of it. Anyone can tell me
> where the default folder locatoin for compiled .jsp files and also how
> you debug jsp code when error is on .jsp but no error on your .java
> file?
>
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[appengine-java] How to detect GAE is in maintenance?

[Jerome]

I would like my app to inform the visitor we are in maintenance, such
as it does not let them do operations that will fail when we try to
write in the Data Store.

Last week, I implemented the code snipped as documented at the bottom
of this page:
http://code.google.com/appengine/docs/java/howto/maintenance.html

public static boolean isGAEDowntime() {
MemcacheService ms = 
MemcacheServiceFactory.getMemcacheService();
ms.setErrorHandler(new StrictErrorHandler());

try {
ms.put("test", "test");
} catch 
(com.google.appengine.api.memcache.MemcacheServiceException
e) {
return true;
}
return false;
}

But, during the downtime, this method was still return false.

What is the best option to figure out we are in the downtime period?

Jerome

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[appengine-java] Re: PdfBox text extraction & GAE

[kldaniels]

This is interesting that you got this to work.

I have been trying to work with PDFBox with GAE as well, and have not
been able to get very far.  I am attempting to open a pdf document as
follows but only get a IOException:

 URL url = new URL("http://www.pbs.org/newshour/extra/teachers/
lessonplans/media/clock_gettysburg_9-3.pdf");
 PDDocument doc = PDDocument.load(url);
 PDDocumentInformation info = doc.getDocumentInformation();

I am not sure what I am doing wrong.

Ken

On Apr 20, 1:00 pm, Fabrizio  wrote:
> If anyone is interested...
>
> PdfBoxtext extration & GAE
> How to do text extraction from pdf files usingPdfBoxon Google App
> Enginehttp://fhtino.blogspot.com/2010/04/pdfbox-text-extration-gae.html
>
>     fabrizio
>
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[appengine-java] Re: Trying to use Ehcache 2.0.1 with web module

[freak3y3]

Hi Sérgio ,

fyi: these existing issues may be releated to your issue:

http://forums.terracotta.org/forums/posts/list/15/2718.page
https://jira.terracotta.org/jira/browse/EHC-617

regards,
Evan

On May 4, 12:39 pm, Sérgio Lopes  wrote:
> Hi Jason
>
> If you have any news please tell us.
> As you said, I cross-posted this question in Ehcache forum too:
>
> http://forums.terracotta.org/forums/posts/list/0/3600.page
>
> Sérgiohttp://www.caelum.com.br
>
>
>
>
>
> On Tue, May 4, 2010 at 13:08, Jason (Google)  wrote:
> > Hi Sergio. I'll try to test this out soon. If you haven't already, you may
> > want to post this in the Ehcache forums also since they can probably help
> > you debug the issue faster:
>
> > - Jason
>
> > On Mon, May 3, 2010 at 1:54 AM, Sergio Lopes  wrote:
>
> >> Hi everybody
>
> >> Ehcach announced recently their AppEngine support. I'm using version
> >> 2.0.1 (latest stable release) with Ehcache Web Module. I'm using
> >> SimpleCachingHeadersPageCachingFilter to cache page results.
>
> >> When I run my application, I'm getting an AccessControlException
> >> because Ehcache Web is trying to do something nasty to the current
> >> Thread (of course, gae does not allow):
>
> >> java.security.AccessControlException: access denied
> >> (java.lang.RuntimePermission modifyThread)
> >>        at
>
> >> java.security.AccessControlContext.checkPermission(AccessControlContext.jav­a:
> >> 323)
> >>        at
> >> java.security.AccessController.checkPermission(AccessController.java:
> >> 546)
> >>        at
> >> java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
> >>        at com.google.appengine.tools.development.DevAppServerFactory
> >> $CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
> >>        at com.google.appengine.tools.development.DevAppServerFactory
> >> $CustomSecurityManager.checkAccess(DevAppServerFactory.java:203)
> >>        at java.lang.Thread.checkAccess(Thread.java:1287)
> >>        at java.lang.Thread.setName(Thread.java:1068)
> >>        at
>
> >> net.sf.ehcache.constructs.web.filter.CachingFilter.buildPageInfo(CachingFil­ter.java:
> >> 240)
> >>        at
>
> >> net.sf.ehcache.constructs.web.filter.CachingFilter.doFilter(CachingFilter.j­ava:
> >> 185)
> >>        at
> >> net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java:86)
> >> 
>
> >> Is there anyone here using Ehcache on GAE? And specifically, Ehcache
> >> Web Module?
> >> I read that ehcache filter implementation and it really seems to call
> >> things restricted by gae
>
> >> I followed the instructions found on Ehcache website:
> >>  http://ehcache.org/documentation/googleappengine.html
> >>  http://ehcache.org/documentation/web_caching.html
>
> >> Is Ehcache really GAE compatible?
>
> >> Tks
> >> Sérgio Lopes
>
> >> --
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> >> google-appengine-j...@googlegroups.com.
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>
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[appengine-java] Re: SimpleDS 1.0_RC1 is out

[Sergio Lopes]

Great news!
I'm currently having some problems with second level cache and JPA, so
a nice alternative like SimpleDS is a good idea.
Just one question: does SimpleDS support query caching too? I've some
very popular queries and want to cache their results in a 2nd level
cache (not only its entities)

Thanks and congratulation for the release

Sérgio Lopes
http://www.caelum.com.br

On May 4, 6:31 am, Nacho Coloma  wrote:
> We are really excited with this release, which is the first feature-
> complete release of SimpleDS. Lots of things have been included in so
> little time.
>
> Getting up-to-date with AppEngine
> 
>
> It's hard to keep up the pace with these guys. This release includes:
>
> * Unindexed attributes.
> * Cursors support.
> * IN and != clauses.
>
> Cache
> =
>
> We have included a great Level 1 and Level 2 cache [1]. If you come
> from JDO/JPA, you may already know how it works:
>
> * Level 1 cache: This is basically a Map bound to the current thread.
> Until the end of the current request, any get() invocation will check
> this cache first. If a match is found, no invocation will be
> propagated to GAE.
> * Level 2 cache: Datastore entities are also stored in memcache, which
> is a second chance to get a positive match.
>
> Cacheable entities must be marked with @Cacheable, with an optional
> expiration time. This feature will work with single and batch get(),
> and the cache entries are updated with put() and delete()
> invocations.
>
> // Invoke memcache or the datastore
> List data = entityManager.get(key1, key2, key3);
>
> // this does not invoke anything (resolved by the Level 1 cache)
> MyData d2 = entityManager.get(key1);
>
> Functions
> 
>
> We are going extremely functional these days [2]. This release
> includes a package with functions to transform collections and
> PagedList instances, which can be combined with batch get() to get
> even better performance results. This is a simple example, equivalent
> to a common situation with relationships:
>
> // n + 1 requests to the datastore
> List data = entityManager.find(query);
> Collection parents =
> Lists.newArrayListwithCapacity(data.size());
> for (MyData d : data) {
>   parents.add(entityManager.get(d.getKey().getParent());
>
> }
>
> // Transformations: 2 requests
> List data = entityManager.find(query);
> Collection parentKeys = Collections2.transform(data, new
> EntityToParentKeyFunction(MyData.class));
> Collection parents = entityManager.get(parentKeys);
>
> That's all it takes to get all entities and their parents, and store
> them in the Level 1 cache so any request by PK will not hit memcache
> or the datastore. This release includes functions to retrieve parent
> and foreign keys, and also works with PagedList. We have taken two
> real-world snapshots with just this optimization (transformation +
> cacheable), applied to a single loop:
>
> Before:http://www.flickr.com/photos/koliseocom/4575062969/sizes/l/
> After:http://www.flickr.com/photos/koliseocom/4575696456/sizes/o
>
> Notice that requests "before" are targeted to the datastore, while
> most of the "after" are memcache requests.
>
> Background tasks
> ==
>
> I know that background tasks [3] are in the roadmap for AppEngine, but
> we needed these today. This started as an exercise to upgrade the
> datastore schema (add properties, delete entities, etc) and ended up
> as a full reusable implementation of tasks that I expect to deprecate
> once that AppEngine includes its own, probably better, implementation.
>
> Background tasks require adding a servlet to web.xml (and optionally
> appengine-web.xml as an admin-console entry) and configuring the tasks
> on application start using plain Java. Tasks can be invoked directly
> by cron triggers, queues or by POST requests.
>
> public class WriteBehindCacheTask extends IterableTask {
>
>         protected WriteBehindCacheTask() {
>                 super("my-task-id");
>         }
>
>         @Override
>         protected SimpleQuery createQuery(TaskRequest request) {
>                 return entityManager.createQuery(MyClass.class);
>         }
>
>         @Override
>         protected void process(MyClass entity, TaskRequest request) {
>                 // ...modify entity...
>                 entityManager.put(entity);
>         }
>
> }
>
> Query cursors and execution deferral will be done transparently (no
> need to limit or handle cursors). There are some implementation
> superclasses depending on what you need to do, and some of them just
> use the raw AppEngine datastore and don't even require SimpleDS to
> work.
>
> This is the first feature-complete release of SimpleDS. Next on the
> roadmap: cached queries and we may be revisiting relations.
>
> As always, all kind of feedback is welcome.
>
> Nacho.
>
> [1]http://code.google.com/p/simpleds/wiki/Cache
> [2]http://code.google.com/p/simpleds/wiki/Functions
> [3]http://code.google.com/p/simpleds/wiki/BackgroundTasks
>

Re: [appengine-java] Trying to use Ehcache 2.0.1 with web module

[Sérgio Lopes]

Hi Jason

If you have any news please tell us.
As you said, I cross-posted this question in Ehcache forum too:

http://forums.terracotta.org/forums/posts/list/0/3600.page

Sérgio
http://www.caelum.com.br

On Tue, May 4, 2010 at 13:08, Jason (Google)  wrote:

> Hi Sergio. I'll try to test this out soon. If you haven't already, you may
> want to post this in the Ehcache forums also since they can probably help
> you debug the issue faster:
>
> - Jason
>
> On Mon, May 3, 2010 at 1:54 AM, Sergio Lopes  wrote:
>
>> Hi everybody
>>
>> Ehcach announced recently their AppEngine support. I'm using version
>> 2.0.1 (latest stable release) with Ehcache Web Module. I'm using
>> SimpleCachingHeadersPageCachingFilter to cache page results.
>>
>> When I run my application, I'm getting an AccessControlException
>> because Ehcache Web is trying to do something nasty to the current
>> Thread (of course, gae does not allow):
>>
>> java.security.AccessControlException: access denied
>> (java.lang.RuntimePermission modifyThread)
>>at
>>
>> java.security.AccessControlContext.checkPermission(AccessControlContext.java:
>> 323)
>>at
>> java.security.AccessController.checkPermission(AccessController.java:
>> 546)
>>at
>> java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
>>at com.google.appengine.tools.development.DevAppServerFactory
>> $CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
>>at com.google.appengine.tools.development.DevAppServerFactory
>> $CustomSecurityManager.checkAccess(DevAppServerFactory.java:203)
>>at java.lang.Thread.checkAccess(Thread.java:1287)
>>at java.lang.Thread.setName(Thread.java:1068)
>>at
>>
>> net.sf.ehcache.constructs.web.filter.CachingFilter.buildPageInfo(CachingFilter.java:
>> 240)
>>at
>>
>> net.sf.ehcache.constructs.web.filter.CachingFilter.doFilter(CachingFilter.java:
>> 185)
>>at
>> net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java:86)
>> 
>>
>> Is there anyone here using Ehcache on GAE? And specifically, Ehcache
>> Web Module?
>> I read that ehcache filter implementation and it really seems to call
>> things restricted by gae
>>
>> I followed the instructions found on Ehcache website:
>>  http://ehcache.org/documentation/googleappengine.html
>>  http://ehcache.org/documentation/web_caching.html
>>
>> Is Ehcache really GAE compatible?
>>
>> Tks
>> Sérgio Lopes
>>
>> --
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>> "Google App Engine for Java" group.
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>> google-appengine-j...@googlegroups.com.
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>> .
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>>
>>
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Re: [appengine-java] Re: Problems enabling Second-level cache with JPA

[Sérgio Lopes]

Thanks for the reply.

And about citing GAE caveats: maybe that's a good idea to promote your
product (I can speak for myself: I never heard about datanucleus before GAE,
and it seems like a nice product).

About 1.1 support: although there is no more support, the current GAE
version + datanucleus-cache-1.1 should have worked?

Thanks in advance and congratulations for the product

On Tue, May 4, 2010 at 13:32, datanucleus  wrote:

> And DataNucleus docs for v2.0, v2.1 don't mention GAE/J since GAE/J
> doesn't work with them, and we've been given no timescales when it
> will.
> The DN v1.1 docs mention GAE/J, but we have absolutely no intention of
> mentioning caveats to specifications necessary to run GAE/J - since we
> see no major reason why the vast majority of JDO3 and JPA2 can't be
> handled cleanly with a NoSQL datastore.
>
> Can't help you with your issue since v1.1 is no longer supported,
> except commercially
>
> --
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[appengine-java] Re: slow responses for query

[Philip Tucker]

On May 4, 3:28 am, "Ikai L (Google)"  wrote:
> Query performance is generally a function of how many objects have to be
> returned in the simple case, which seems to be what you are doing here. How
> many PlayerGameStates exist per User?

No more than 10 so far. Like I said, it was only 5 in this case.

> Are PlayerGameStates child entities of a User?

No. They contain a userKey, which is the field on which I'm querying
them.

> The reason I mentioned "denormalizing" is because the concept of
> normalization doesn't make as much sense with App Engine's datastore. We
> don't provide referential integrity, for instance, and transactions exist
> around entity groups, not globally. You don't pay a penalty for storing data
> that is sparse - some User entities can be huge, some can be tiny. You
> should optimize for reads. Doing multiple writes and the risk of data
> getting out of sync can suck, but as long as it is recoverable you should be
> okay. Contrast the performance of the query above with storing
> PlayerGameStates inside User. You'd do this:

But then I'd have to run a separate query to fetch the game. Unless I
duplicate the game state and move all those fields into
PlayerGameState, which perhaps is what you're suggesting. But then I'd
have to fetch both users every time, right (to update the duplicate
game state), which means every player needs to contain the userKey of
everyone they're playing.

Most of my reads are by gameKey. There's only one case where I'm
fetching all the games for a user. I don't really need this case to be
optimized: 2-3 seconds would be acceptable. 80-90% of the time it's ~1
second. But these occasional 10-20 second fetches are crazy.

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[appengine-java] Re: Serialization Error on GData Spreadhseet

[Rudolf]

Hello,

I fixed above mentioned problem by a more accurate design of my
Servlets; the code is now executing on GAE;

nevertheless, now I face another problem; the data calculation for the
response on the GAE takes more then 30 seconds; at about 30 seconds
GAE kills my request;

I found a lot of threads in the Web on this issue, but not the
information I have looked for;

is it possible to tell GAE, that a request takes more then 30
seconds?

it is difficult to split my application into different requests, since
within one request I have to get the data of a Spreadsheet (more than
6000 data records) for the calculation of a result; this event will
eventually take more then 30 seconds;

any idea how I can handle this;

thanks in advance for your help;

Best Regards
Rudolf

On 4 Mai, 18:10, Rudolf  wrote:
> Hello Ikai,
>
> I have a mix of functions which read or write data from/to a
> Spreadsheet;
>
> I fail on both;
>
> Best Regards
> Rudolf
>
> On 4 Mai, 11:06, "Ikai L (Google)"  wrote:
>
>
>
>
>
> > Are you storing something in the session, such as an instance of the GData
> > client?
>
> > On Mon, May 3, 2010 at 7:20 PM, Rudolf wrote:
>
> > > Hello,
>
> > > I am new on Google App Engine;
>
> > > I wrote some code which accesses a Google Spreadsheet through the
> > > provided GData Java API;
>
> > > everythings works well running in the Eclipse local Environment or
> > > running the code on a local Apache Tomcat Server;
>
> > > nevertheless, running the code on the Google App Engine (deployed
> > > through Elipse) fails with the following error:
> > > Error: Server Error
> > > The server encountered an error and could not complete your request.
> > > If the problem persists, please report your problem and mention this
> > > error message and the query that caused it.
>
> > > the App Engine log gives me the following information:
> > > Uncaught exception from servlet
> > > java.lang.RuntimeException: java.io.NotSerializableException:
> > > com.google.gdata.client.spreadsheet.SpreadsheetService
> > >        at
>
> > > com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager­­.java:
> > > 361)
> > >        at
>
> > > com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(S­­essionManager.java:
> > > 341)
> > > ...
>
> > > Any idea what I am doing wrong;
>
> > > thank you in advance for your help;
>
> > > Best Regards
> > > Rudolf
>
> > > --
> > > You received this message because you are subscribed to the Google Groups
> > > "Google App Engine for Java" group.
> > > To post to this group, send email to
> > > google-appengine-j...@googlegroups.com.
> > > To unsubscribe from this group, send email to
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> > > .
> > > For more options, visit this group at
> > >http://groups.google.com/group/google-appengine-java?hl=en.
>
> > --
> > Ikai Lan
> > Developer Relations, Google App Engine
> > Twitter:http://twitter.com/ikai
> > Delicious:http://delicious.com/ikailan
>
> > 
> > Google App Engine links:
> > Blog:http://googleappengine.blogspot.com
> > Twitter:http://twitter.com/app_engine
> > Reddit:http://www.reddit.com/r/appengine
>
> > --
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[appengine-java] JSP code debug: Compiled JSP location in local environment

[bobo]

Hi

I got following error in my local enviroment of Google App Eng with
Eclipse plugin:
at org.apache.jsp.scoreresult_jsp._jspService(scoreresult_jsp.java:
161)

I would like to see the code on line 161 of compiled scoreresult.jsp
file. But I can't find out the location of it. Anyone can tell me
where the default folder locatoin for compiled .jsp files and also how
you debug jsp code when error is on .jsp but no error on your .java
file?

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Re: [appengine-java] Re: one project access classes in another project in same account

[Don Schwarz]

Bruce, an "application" is the fundamental unit of isolation in App Engine.
 There are no guarantees that two applications will be available in the same
data center, let alone loaded onto the same servers.  Each application can
have more than one administrator, so it's unclear how any automated grouping
of applications based on their administrator list would work.

Is there a reason you can't just deploy all of the code you need as a single
application?

On Tue, May 4, 2010 at 1:08 PM, bhomass  wrote:

> Patrick
>
> I don't know if you are personally involved with the restriction
> policy, but I am wondering why is this not allowed? these are apps
> belonging to the same account. there should be no security concerns.
> why this extra restriction?
>
> Bruce
>
> On May 4, 12:55 am, Patrick Cornelißen 
> wrote:
> > Hi!
> >
> > 2010/5/4bhomass:
> >
> > > using tomcat, I have been able to have one central web app access
> > > classes from surrounding web apps by simply using URLClassLoader based
> > > on the file path of the class folder.
> >
> > > is there a way to do the same once I deploy to GAE?
> >
> > I don't think that this is allowed, as different GAE apps are not
> > allowed to act as one app and this is really going into that
> > direction.
> >
> > So I think it's technically possible, but not allowed.
> >
> > --
> > Mit freundlichen Grüßen,  // Bye,
> >   Patrick Cornelißen
> >  http://www.openprojectguide.org
> >  http://www.pcornelissen.dehttp://code.google.com/p/gloudy/
> >
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Re: [appengine-java] Re: unable to use sdk 1.3.3.1

[Wayne Fay]

Read the whole stack trace (I cut out the important parts below). Way
down near the bottom you have a NoClassDefFoundError and
ClassNotFoundException that may be the actual source of your problems.
Also a RuntimeException that may be related.

Wayne

On Tue, May 4, 2010 at 8:07 AM, RockyWolf  wrote:
> I removed my eclipse ganymade, and installed eclipse galileo. Running
> app engine 1.3.3.1 now allows me to run my app, but I still get the
> previous
> java.net.ConnectException: Connection timed out: connect exception.
>
>
>
> On May 3, 3:40 pm, RockyWolf  wrote:
>> Hi, I can't understand why my app which runs on 1.2.1 doesn't run on
>> 1.3.3.1 .
>>
>> I keep getting the following error message when I run my app:
>>
>> com.google.appengine.tools.info.RemoteVersionFactory getVersion
>> INFO: Unable to 
>> accesshttp://appengine.google.com/api/updatecheck?runtime=java&release=1.3['1.0']
>> java.net.ConnectException: Connection timed out: connect
>>         at java.net.PlainSocketImpl.socketConnect(Native Method)
>>         at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
>>         at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:
>> 195)



>> java.lang.RuntimeException: Unable to locate the App Engine agent.
>> Please use dev_appserver, KickStart,  or set the jvm flag: "-
>> javaagent:/lib/agent/appengine-agent.jar"



>> Caused by: java.lang.NoClassDefFoundError: com/google/appengine/tools/
>> development/agent/AppEngineDevAgent
>>         at
>> com.google.appengine.tools.development.DevAppServerFactory.testAgentIsInsta­lled(DevAppServerFactory.java:
>> 98)
>>         ... 6 more
>> Caused by: java.lang.ClassNotFoundException:
>> com.google.appengine.tools.development.agent.AppEngineDevAgent
>>         at java.net.URLClassLoader$1.run(URLClassLoader.java:200)

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[appengine-java] Re: one project access classes in another project in same account

[bhomass]

Patrick

I don't know if you are personally involved with the restriction
policy, but I am wondering why is this not allowed? these are apps
belonging to the same account. there should be no security concerns.
why this extra restriction?

Bruce

On May 4, 12:55 am, Patrick Cornelißen 
wrote:
> Hi!
>
> 2010/5/4bhomass:
>
> > using tomcat, I have been able to have one central web app access
> > classes from surrounding web apps by simply using URLClassLoader based
> > on the file path of the class folder.
>
> > is there a way to do the same once I deploy to GAE?
>
> I don't think that this is allowed, as different GAE apps are not
> allowed to act as one app and this is really going into that
> direction.
>
> So I think it's technically possible, but not allowed.
>
> --
> Mit freundlichen Grüßen,  // Bye,
>   Patrick Cornelißen
>  http://www.openprojectguide.org
>  http://www.pcornelissen.dehttp://code.google.com/p/gloudy/
>
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[appengine-java] Re: How to make BlobServlet send non-empty response?

[Jaroslav Záruba]

Or do you mean I should read the post data, send them to uploadUrl
using another request I create, and then write response to the
original one...?
That might probably work... :P

On May 4, 6:43 pm, Jaroslav Záruba  wrote:
> Can you be more specific please?
> (After redirecting request you can't write to its response.)
>
> Regards
>   J. Záruba
>
> On May 4, 10:01 am, bimbo jones  wrote:
>
>
>
>
>
> > hi,
>
> > You can redirect the upload servlet to another servlet that responds.
>
> > 2010/5/3 Jaroslav Záruba 
>
> > > I'm trying to use SWFUpload for uploading images in my application but
> > > either this particular component or Flash does not like empty
> > > responses.
> > > Is it possible somehow to get any content in the response-body from
> > > uploadUrl?
>
> > > Regards
> > >  J. Záruba
>
> > > --
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[appengine-java] Re: How to make BlobServlet send non-empty response?

[Jaroslav Záruba]

Can you be more specific please?
(After redirecting request you can't write to its response.)

Regards
  J. Záruba

On May 4, 10:01 am, bimbo jones  wrote:
> hi,
>
> You can redirect the upload servlet to another servlet that responds.
>
> 2010/5/3 Jaroslav Záruba 
>
>
>
>
>
> > I'm trying to use SWFUpload for uploading images in my application but
> > either this particular component or Flash does not like empty
> > responses.
> > Is it possible somehow to get any content in the response-body from
> > uploadUrl?
>
> > Regards
> >  J. Záruba
>
> > --
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[appengine-java] Re: Problems enabling Second-level cache with JPA

[datanucleus]

And DataNucleus docs for v2.0, v2.1 don't mention GAE/J since GAE/J
doesn't work with them, and we've been given no timescales when it
will.
The DN v1.1 docs mention GAE/J, but we have absolutely no intention of
mentioning caveats to specifications necessary to run GAE/J - since we
see no major reason why the vast majority of JDO3 and JPA2 can't be
handled cleanly with a NoSQL datastore.

Can't help you with your issue since v1.1 is no longer supported,
except commercially

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[appengine-java] Re: Serialization Error on GData Spreadhseet

[Rudolf]

Hello Ikai,

I have a mix of functions which read or write data from/to a
Spreadsheet;

I fail on both;

Best Regards
Rudolf

On 4 Mai, 11:06, "Ikai L (Google)"  wrote:
> Are you storing something in the session, such as an instance of the GData
> client?
>
> On Mon, May 3, 2010 at 7:20 PM, Rudolf wrote:
>
>
>
>
>
> > Hello,
>
> > I am new on Google App Engine;
>
> > I wrote some code which accesses a Google Spreadsheet through the
> > provided GData Java API;
>
> > everythings works well running in the Eclipse local Environment or
> > running the code on a local Apache Tomcat Server;
>
> > nevertheless, running the code on the Google App Engine (deployed
> > through Elipse) fails with the following error:
> > Error: Server Error
> > The server encountered an error and could not complete your request.
> > If the problem persists, please report your problem and mention this
> > error message and the query that caused it.
>
> > the App Engine log gives me the following information:
> > Uncaught exception from servlet
> > java.lang.RuntimeException: java.io.NotSerializableException:
> > com.google.gdata.client.spreadsheet.SpreadsheetService
> >        at
>
> > com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager­.java:
> > 361)
> >        at
>
> > com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(S­essionManager.java:
> > 341)
> > ...
>
> > Any idea what I am doing wrong;
>
> > thank you in advance for your help;
>
> > Best Regards
> > Rudolf
>
> > --
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> Developer Relations, Google App Engine
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>
> 
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Re: [appengine-java] Trying to use Ehcache 2.0.1 with web module

[Jason (Google)]

Hi Sergio. I'll try to test this out soon. If you haven't already, you may
want to post this in the Ehcache forums also since they can probably help
you debug the issue faster:

- Jason

On Mon, May 3, 2010 at 1:54 AM, Sergio Lopes  wrote:

> Hi everybody
>
> Ehcach announced recently their AppEngine support. I'm using version
> 2.0.1 (latest stable release) with Ehcache Web Module. I'm using
> SimpleCachingHeadersPageCachingFilter to cache page results.
>
> When I run my application, I'm getting an AccessControlException
> because Ehcache Web is trying to do something nasty to the current
> Thread (of course, gae does not allow):
>
> java.security.AccessControlException: access denied
> (java.lang.RuntimePermission modifyThread)
>at
>
> java.security.AccessControlContext.checkPermission(AccessControlContext.java:
> 323)
>at
> java.security.AccessController.checkPermission(AccessController.java:
> 546)
>at
> java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
>at com.google.appengine.tools.development.DevAppServerFactory
> $CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
>at com.google.appengine.tools.development.DevAppServerFactory
> $CustomSecurityManager.checkAccess(DevAppServerFactory.java:203)
>at java.lang.Thread.checkAccess(Thread.java:1287)
>at java.lang.Thread.setName(Thread.java:1068)
>at
>
> net.sf.ehcache.constructs.web.filter.CachingFilter.buildPageInfo(CachingFilter.java:
> 240)
>at
>
> net.sf.ehcache.constructs.web.filter.CachingFilter.doFilter(CachingFilter.java:
> 185)
>at
> net.sf.ehcache.constructs.web.filter.Filter.doFilter(Filter.java:86)
> 
>
> Is there anyone here using Ehcache on GAE? And specifically, Ehcache
> Web Module?
> I read that ehcache filter implementation and it really seems to call
> things restricted by gae
>
> I followed the instructions found on Ehcache website:
>  http://ehcache.org/documentation/googleappengine.html
>  http://ehcache.org/documentation/web_caching.html
>
> Is Ehcache really GAE compatible?
>
> Tks
> Sérgio Lopes
>
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[appengine-java] Re: Servlet request parameters empty

[Rob]

Just read the "and/or", POST working great this way too. Thanks again!
-Rob

On May 4, 7:30 am, Rob  wrote:
> That did the trick, I love you man! :O)
>
> Now, how would I perform the same with a POST if I needed to?
>
> -Rob
>
> On May 4, 2:07 am, Stephan Hartmann  wrote:
>
>
>
>
>
> > if you want to get your data as request parameter, you should use "GET"
> > instead of "POST" and /or let the default contentType
> > "application/x-www-form-urlencoded" and create your json object as either
>
> >     var json = {name: "test"};  // and let jquery convert it to a query
> > string
> > or
> >     var json = "name=test";   // the desired query string
>
> > regards,
> > Stephan
>
> > 2010/5/4 Rob 
>
> > > I'm running Google App Engine through IntelliJ Idea and am posting
> > > data to a Servlet using jQuery.ajax. I'm hitting the Servlet without
> > > issue and can return data in the response, however, the request
> > > parameters are always null; I cant seem to POST data. Where am I going
> > > wrong?
>
> > > var json = JSON2.stringify({name: "test"});
>
> > > $.ajax({
> > >            type: "POST",
> > >            url: service,
> > >            data: json,
> > >            contentType: "application/json; charset=utf-8",
> > >            dataType: "json",
> > >            async: async,
> > >            success: function(o) {
> > >                 o = $.serviceHelper.jsonSerialize(o);
> > >                   callback(o);
> > >            },
> > >            error: this.dataServiceError
> > >        });
>
> > >    protected void doPost(javax.servlet.http.HttpServletRequest
> > > request, javax.servlet.http.HttpServletResponse response) throws
> > > javax.servlet.ServletException, IOException {
>
> > >        PrintWriter out = response.getWriter();
> > >        response.setContentType("text/json");
> > >        String json = gson.toJson(request.getParameter("name"));
> > >        out.println(json);
>
> > >    }
>
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Re: [appengine-java] Re: VerifyError on no-op default constructor

[Don Schwarz]

On Tue, May 4, 2010 at 4:15 AM, Attila Szegedi  wrote:

> I made a new version of the freemarker.jar, with a workaround for this
> problem.
>
> Download link for new freemarker JAR:  projects/freemarker/files/freemarker/2.3.16/freemarker-gae-pre3.jar/
> download>
>
> The workaround will delay loading of the
> FreeMarkerJspApplicationContext class as long as possible. It will now
> let the JSP taglibs work in FreeMarker on GAE as long as the custom
> JSP tags are not trying to use either
> JspFactory.getJspApplicationContext() or PageContext.getELContext(). I
> expect majority of taglibs out there fall into this category; those
> that do rely on this functionality though are, for the time being, out
> of luck - until GAE allows our class that implements
> JspApplicationContext through the verifier.
>
> Ah, great, glad you found a partial workaround, at least.


> Don, since this workaround is only partial, the ultimate solution
> would be to let our FreeMarkerJspApplicationContext through the
> verifier. Do you see any problem with that going forward?
>
> As I said earlier in this thread, I believe this will be fixed shortly
(most likely in our next release).

If you'd like me to confirm that this works, please provide a compiled
application (or instructions how to compile one) and I will test it out
against our release candidate.

Thanks,
Don

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Re: [appengine-java] Re: Servlet request parameters empty

[Stephan Hartmann]

2010/5/4 Rob 

> That did the trick, I love you man! :O)
>
>
:-)


> Now, how would I perform the same with a POST if I needed to?
>
>
If you want to POST your data as key/value pairs like with GET, and jQuery
puts it into the body of the request instead of the query string (i don't
know the implementation details, request parameters as query string are just
fine even if it is a POST request) you have to make sure that the
contentType is the default "application/x-www-form-urlencoded". Just give it
a try.

However, if you want to post the data as JSON fragment (as i would assume
from your original post from the contentType of "application/json"), i think
setting "processData" to "false" could do it. But in your servlet you won't
get the values as request parameters anymore. Instead you have to parse the
input stream of the request, e.g. with Gson to a Java object.

regards,
Stephan


>
> On May 4, 2:07 am, Stephan Hartmann  wrote:
> > if you want to get your data as request parameter, you should use "GET"
> > instead of "POST" and /or let the default contentType
> > "application/x-www-form-urlencoded" and create your json object as either
> >
> > var json = {name: "test"};  // and let jquery convert it to a query
> > string
> > or
> > var json = "name=test";   // the desired query string
> >
> > regards,
> > Stephan
> >
> > 2010/5/4 Rob 
> >
> >
> >
> >
> >
> > > I'm running Google App Engine through IntelliJ Idea and am posting
> > > data to a Servlet using jQuery.ajax. I'm hitting the Servlet without
> > > issue and can return data in the response, however, the request
> > > parameters are always null; I cant seem to POST data. Where am I going
> > > wrong?
> >
> > > var json = JSON2.stringify({name: "test"});
> >
> > > $.ajax({
> > >type: "POST",
> > >url: service,
> > >data: json,
> > >contentType: "application/json; charset=utf-8",
> > >dataType: "json",
> > >async: async,
> > >success: function(o) {
> > > o = $.serviceHelper.jsonSerialize(o);
> > >   callback(o);
> > >},
> > >error: this.dataServiceError
> > >});
> >
> > >protected void doPost(javax.servlet.http.HttpServletRequest
> > > request, javax.servlet.http.HttpServletResponse response) throws
> > > javax.servlet.ServletException, IOException {
> >
> > >PrintWriter out = response.getWriter();
> > >response.setContentType("text/json");
> > >String json = gson.toJson(request.getParameter("name"));
> > >out.println(json);
> >
> > >}
> >
> > > --
> > > You received this message because you are subscribed to the Google
> Groups
> > > "Google App Engine for Java" group.
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[appengine-java] Re: Cache pages in Memcache

[Sergio Lopes]

Thanks for your answers!

The Cache-control idea is a good one, I think I'll try something here.
But maybe it's a good idea to have some kind of server cache too.

Ehcache Web Module has a nice Java Filter that threats many corner
cases (headers, gzip, ...). The only problem is that it's too coupled
to Ehcache. I think I'll try to fork that project to use their Filter
with AppEngine's memcache :)



On May 4, 6:22 am, Nacho Coloma  wrote:
> Hi Sergio,
>
> > I'm thinking in a Filter that put page results in memcache when first
> > accessed, and then getting that result in former accesses.
>
> That should work. All page cache implementations do more or less the
> same.
>
> > The idea is simple but the implementation is not. (how to get the
> > first request response? how to implement proper header management in
> > that filter? how to not disable gzip using this?)
>
> * If there is content in memcache, you can deliver it and exit.
> Otherwise, let the request proceed, and store in the cache.
> * Be sure to set the cache timeout and calculate the cache key
> correctly (e.g. include the user ID or the user locale if the cached
> contents depend on that).
> * For HTTP headers, this presentation may 
> help:http://www.slideshare.net/icoloma/caching-web-contents-in-the-browser...
>
> It's  more or less the same with JSP page fragments (except the
> headers, of course). No rocket science.
>
> Cheers,
>
> Nacho.
>
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[appengine-java] Re: Servlet request parameters empty

[Rob]

That did the trick, I love you man! :O)

Now, how would I perform the same with a POST if I needed to?

-Rob



On May 4, 2:07 am, Stephan Hartmann  wrote:
> if you want to get your data as request parameter, you should use "GET"
> instead of "POST" and /or let the default contentType
> "application/x-www-form-urlencoded" and create your json object as either
>
>     var json = {name: "test"};  // and let jquery convert it to a query
> string
> or
>     var json = "name=test";   // the desired query string
>
> regards,
> Stephan
>
> 2010/5/4 Rob 
>
>
>
>
>
> > I'm running Google App Engine through IntelliJ Idea and am posting
> > data to a Servlet using jQuery.ajax. I'm hitting the Servlet without
> > issue and can return data in the response, however, the request
> > parameters are always null; I cant seem to POST data. Where am I going
> > wrong?
>
> > var json = JSON2.stringify({name: "test"});
>
> > $.ajax({
> >            type: "POST",
> >            url: service,
> >            data: json,
> >            contentType: "application/json; charset=utf-8",
> >            dataType: "json",
> >            async: async,
> >            success: function(o) {
> >                 o = $.serviceHelper.jsonSerialize(o);
> >                   callback(o);
> >            },
> >            error: this.dataServiceError
> >        });
>
> >    protected void doPost(javax.servlet.http.HttpServletRequest
> > request, javax.servlet.http.HttpServletResponse response) throws
> > javax.servlet.ServletException, IOException {
>
> >        PrintWriter out = response.getWriter();
> >        response.setContentType("text/json");
> >        String json = gson.toJson(request.getParameter("name"));
> >        out.println(json);
>
> >    }
>
> > --
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Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

[Tristan Slominski]

Sure, good luck.

On May 4, 2010 9:03 AM, "romesh soni"  wrote:

Hey Tristan,

Seems you have got it solved. Thanks. I think it should work for me without
any issues. I will let you know once I implement it.
You have a good logic man. Can I add you on Gmail?

Thanks and Regards
Romesh



On Tue, May 4, 2010 at 7:08 PM, Tristan Slominski <
tristan.slomin...@gmail.com> wrote:
>
> Yes, bu...

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Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

[romesh soni]

Hey Tristan,

Seems you have got it solved. Thanks. I think it should work for me without
any issues. I will let you know once I implement it.
You have a good logic man. Can I add you on Gmail?

Thanks and Regards
Romesh

On Tue, May 4, 2010 at 7:08 PM, Tristan Slominski <
tristan.slomin...@gmail.com> wrote:

> Yes, but then you just do a test on the entity you got from the query (one
> test on one entity, fast)
>
> so add a last step.. using previous logic you end up with x2=71 y2=75
> final step will beis (z of 76) < (y2 of 75)   if no... no results..
> if yes... have 1 result
>
> that should solve that part
>
>
> On Tue, May 4, 2010 at 02:04, romesh soni  wrote:
>
>> Hi Tristan,
>>
>> Really appreciate the logic you suggested.  But consider this case:
>>
>> There are only two intervals in db: x1 = 4   y1 = 70   and  x2 = 71   y2 =
>> 75.
>>
>> I want to search by 76. The 76 doesn't fall in any category but still the
>> query will return the second interval, which is not correct.
>> Instead the query should say that there is no matching interval. Am I
>> correct?
>>
>> Regards
>> Romesh
>>
>>
>> On Tue, May 4, 2010 at 11:09 AM, Tristan Slominski <
>> tristan.slomin...@gmail.com> wrote:
>>
>>> in that case the solution to your dilemma is as follows
>>>
>>> query.addFilter("x", FilterOptions.LESS_THAN, z);
>>> query.addSort("x", SortOrder.DESC);
>>>
>>> then execute the query with a limit of 1
>>> that is the answer you seek
>>>
>>> in other words...
>>>
>>> assume you have two intervalsx1 = 4   y1 = 70   and  x2 = 71   y2 =
>>> 75.
>>> you want to find interval that matches your condition ofx < 74 < y
>>>
>>> add filter for x less than 74 will give you two results where x1=4 in
>>> first result and x2=71 in second result
>>> now sort these results descending so that x2 is the first result   x2=71
>>> x1=4
>>> set limit of 1 gives your query a result of x2
>>>
>>> you don't need property y
>>>
>>> does that work for you?
>>>
>>> On Mon, May 3, 2010 at 22:45, romesh soni  wrote:
>>>
 Hi Tristan,

 You got a good catch. But the code which populates the data will never
 let this happen. If there is a pair x = 4 and y = 10, then there will be no
 such other pair which consist values between 4 and 10. there will be one 
 and
 only one set for values 4,5,6,7,8,9,10 and that will be (4,10). I hope my
 explanation is helpful. So it is guaranteed of having one solution per
 query.

 On Mon, May 3, 2010 at 7:31 PM, Tristan Slominski <
 tristan.slomin...@gmail.com> wrote:

> Hey, so I've been thinking about the problem description... you
> mentioned that there will ever only be one solution for the query, but 
> that
> doesn't seem like a valid constraint. For example, let x = 4 and y = 10, 
> let
> x2 = 5 and y2 = 11.  The value of z = 6 will result in two solutions.
>
> The reason I am asking, is that the contraint of only one solution
> existing suggest a different mapping of solutions than the one you 
> suggested
> (not sure what that different approach would be yet, but it could be
> something along the lines of enumerating the intervals).
>
> Can you guarantee the constraint of only one solution per query?
>
> On May 3, 2010 3:01 AM, "romesh soni"  wrote:
>
> Hi Thomas,
>
> the possible value of x and y can be 2020 and 203204206207.
> do you see that it is possible to make such thing in 5000 element
> limitation. Are you talking of ArrayList?
>
> Your solution is good for small list, but I am afraid that it will not
> suit my requirement..
>
>
>
>
> On Mon, May 3, 2010 at 1:00 PM, Thomas  wrote:
> >
> > Hi romesh:
> >
> >Datastor...
>
>  --
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>>>
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Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

[Tristan Slominski]

Yes, but then you just do a test on the entity you got from the query (one
test on one entity, fast)

so add a last step.. using previous logic you end up with x2=71 y2=75
final step will beis (z of 76) < (y2 of 75)   if no... no results..   if
yes... have 1 result

that should solve that part

On Tue, May 4, 2010 at 02:04, romesh soni  wrote:

> Hi Tristan,
>
> Really appreciate the logic you suggested.  But consider this case:
>
> There are only two intervals in db: x1 = 4   y1 = 70   and  x2 = 71   y2 =
> 75.
>
> I want to search by 76. The 76 doesn't fall in any category but still the
> query will return the second interval, which is not correct.
> Instead the query should say that there is no matching interval. Am I
> correct?
>
> Regards
> Romesh
>
>
> On Tue, May 4, 2010 at 11:09 AM, Tristan Slominski <
> tristan.slomin...@gmail.com> wrote:
>
>> in that case the solution to your dilemma is as follows
>>
>> query.addFilter("x", FilterOptions.LESS_THAN, z);
>> query.addSort("x", SortOrder.DESC);
>>
>> then execute the query with a limit of 1
>> that is the answer you seek
>>
>> in other words...
>>
>> assume you have two intervalsx1 = 4   y1 = 70   and  x2 = 71   y2 =
>> 75.
>> you want to find interval that matches your condition ofx < 74 < y
>>
>> add filter for x less than 74 will give you two results where x1=4 in
>> first result and x2=71 in second result
>> now sort these results descending so that x2 is the first result   x2=71
>> x1=4
>> set limit of 1 gives your query a result of x2
>>
>> you don't need property y
>>
>> does that work for you?
>>
>> On Mon, May 3, 2010 at 22:45, romesh soni  wrote:
>>
>>> Hi Tristan,
>>>
>>> You got a good catch. But the code which populates the data will never
>>> let this happen. If there is a pair x = 4 and y = 10, then there will be no
>>> such other pair which consist values between 4 and 10. there will be one and
>>> only one set for values 4,5,6,7,8,9,10 and that will be (4,10). I hope my
>>> explanation is helpful. So it is guaranteed of having one solution per
>>> query.
>>>
>>> On Mon, May 3, 2010 at 7:31 PM, Tristan Slominski <
>>> tristan.slomin...@gmail.com> wrote:
>>>
 Hey, so I've been thinking about the problem description... you
 mentioned that there will ever only be one solution for the query, but that
 doesn't seem like a valid constraint. For example, let x = 4 and y = 10, 
 let
 x2 = 5 and y2 = 11.  The value of z = 6 will result in two solutions.

 The reason I am asking, is that the contraint of only one solution
 existing suggest a different mapping of solutions than the one you 
 suggested
 (not sure what that different approach would be yet, but it could be
 something along the lines of enumerating the intervals).

 Can you guarantee the constraint of only one solution per query?

 On May 3, 2010 3:01 AM, "romesh soni"  wrote:

 Hi Thomas,

 the possible value of x and y can be 2020 and 203204206207.
 do you see that it is possible to make such thing in 5000 element
 limitation. Are you talking of ArrayList?

 Your solution is good for small list, but I am afraid that it will not
 suit my requirement..




 On Mon, May 3, 2010 at 1:00 PM, Thomas  wrote:
 >
 > Hi romesh:
 >
 >Datastor...

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Re: [appengine-java] Re: indexes

[Tristan Slominski]

Ah, I understand. Yeah, they don't show you the automatic ones.

On Tue, May 4, 2010 at 03:16, Philip Tucker  wrote:

> Thanks. By "table" I mean annotated Java class. One reason I was
> confused about the indexes is I don't see many of the ones I would
> expect when I navigate to https://appengine.google.com/datastore/indexes,
> but I guess they must exist or my queries would be failing.
>
> On Apr 30, 2:16 pm, Tristan  wrote:
> > uhm... read the next section?
> >
> > http://code.google.com/appengine/docs/java/datastore/queriesandindexe...
> >
> > as far as indexes getting applied to existing tables... (not sure by
> > what you mean by "table"), but yes, that's why when you upload new
> > index it is "building", it's being applied to existing stuff.
> >
> > On Apr 30, 12:54 am, Philip Tucker  wrote:
> >
> >
> >
> >
> >
> > > According to this, "The App Engine datastore maintains an index for
> > > every query an application intends to make."
> >
> > >http://code.google.com/appengine/docs/java/datastore/queriesandindexe.
> ..
> >
> > > Does GAE just scan the app Java code for Query.setFilter, or do we
> > > need to do annotate queries for these indexes to be generated.
> >
> > > Also, it appears new indexes do not get applied to existing tables
> > > when we deploy application code with new queries or @INDEX annotations
> > > - is this correct? Is there a way to do that, or are we required to
> > > create a new table and copy the data over?
> >
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[appengine-java] Re: unable to use sdk 1.3.3.1

[RockyWolf]

I removed my eclipse ganymade, and installed eclipse galileo. Running
app engine 1.3.3.1 now allows me to run my app, but I still get the
previous
java.net.ConnectException: Connection timed out: connect exception.



On May 3, 3:40 pm, RockyWolf  wrote:
> Hi, I can't understand why my app which runs on 1.2.1 doesn't run on
> 1.3.3.1 .
>
> I keep getting the following error message when I run my app:
>
> com.google.appengine.tools.info.RemoteVersionFactory getVersion
> INFO: Unable to 
> accesshttp://appengine.google.com/api/updatecheck?runtime=java&release=1.3['1.0']
> java.net.ConnectException: Connection timed out: connect
>         at java.net.PlainSocketImpl.socketConnect(Native Method)
>         at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
>         at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:
> 195)
>         at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
>         at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
>         at java.net.Socket.connect(Socket.java:519)
>         at java.net.Socket.connect(Socket.java:469)
>         at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
>         at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
>         at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
>         at sun.net.www.http.HttpClient.(HttpClient.java:233)
>         at sun.net.www.http.HttpClient.New(HttpClient.java:306)
>         at sun.net.www.http.HttpClient.New(HttpClient.java:323)
>         at
> sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnectio...
> 837)
>         at
> sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:
> 778)
>         at
> sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:
> 703)
>         at
> sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection
> 1026)
>         at java.net.URL.openStream(URL.java:1009)
>         at
> com.google.appengine.tools.info.RemoteVersionFactory.getVersion(RemoteVersi­onFactory.java:
> 70)
>         at
> com.google.appengine.tools.info.UpdateCheck.checkForUpdates(UpdateCheck.jav­a:
> 94)
>         at
> com.google.appengine.tools.info.UpdateCheck.doNagScreen(UpdateCheck.java:
> 164)
>         at
> com.google.appengine.tools.info.UpdateCheck.maybePrintNagScreen(UpdateCheck­.java:
> 132)
>         at com.google.appengine.tools.development.DevAppServerMain
> $StartAction.apply(DevAppServerMain.java:150)
>         at com.google.appengine.tools.util.Parser
> $ParseResult.applyArgs(Parser.java:48)
>         at
> com.google.appengine.tools.development.DevAppServerMain.(DevAppServer­Main.java:
> 113)
>         at
> com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMa­in.java:
> 89)
> java.lang.RuntimeException: Unable to locate the App Engine agent.
> Please use dev_appserver, KickStart,  or set the jvm flag: "-
> javaagent:/lib/agent/appengine-agent.jar"
>         at
> com.google.appengine.tools.development.DevAppServerFactory.testAgentIsInsta­lled(DevAppServerFactory.java:
> 102)
>         at
> com.google.appengine.tools.development.DevAppServerFactory.createDevAppServ­er(DevAppServerFactory.java:
> 77)
>         at
> com.google.appengine.tools.development.DevAppServerFactory.createDevAppServ­er(DevAppServerFactory.java:
> 38)
>         at com.google.appengine.tools.development.DevAppServerMain
> $StartAction.apply(DevAppServerMain.java:153)
>         at com.google.appengine.tools.util.Parser
> $ParseResult.applyArgs(Parser.java:48)
>         at
> com.google.appengine.tools.development.DevAppServerMain.(DevAppServer­Main.java:
> 113)
>         at
> com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMa­in.java:
> 89)
> Caused by: java.lang.NoClassDefFoundError: com/google/appengine/tools/
> development/agent/AppEngineDevAgent
>         at
> com.google.appengine.tools.development.DevAppServerFactory.testAgentIsInsta­lled(DevAppServerFactory.java:
> 98)
>         ... 6 more
> Caused by: java.lang.ClassNotFoundException:
> com.google.appengine.tools.development.agent.AppEngineDevAgent
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
>         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
>         ... 7 more
>
> I tried to use the update site for eclipse ganymade, but I got the
> error, "No repository found."
> Then I followed the instructions for "installing the Google Plugin for
> Eclipse from zip files". (http://code.google.com/eclipse/docs/install-
> from-zip.html)
>
> But when I tried to install " Ganymede Up

Re: [appengine-java] Re: slow responses for query

[Ikai L (Google)]

Query performance is generally a function of how many objects have to be
returned in the simple case, which seems to be what you are doing here. How
many PlayerGameStates exist per User?

Queries work like this:

- iterate through the index to find all PlayerGameStates with the property
given to find the keys of all PlayerGameStates matching this property
- run the query for all objects

Are PlayerGameStates child entities of a User? I have to double check, but I
believe this could reduce the App Engine datastore's ability to parallelize
the queries-by-key, though the effect of this should be negligible if you
are only fetching 5 objects.

The reason I mentioned "denormalizing" is because the concept of
normalization doesn't make as much sense with App Engine's datastore. We
don't provide referential integrity, for instance, and transactions exist
around entity groups, not globally. You don't pay a penalty for storing data
that is sparse - some User entities can be huge, some can be tiny. You
should optimize for reads. Doing multiple writes and the risk of data
getting out of sync can suck, but as long as it is recoverable you should be
okay. Contrast the performance of the query above with storing
PlayerGameStates inside User. You'd do this:

- Get user by key

That's it! This is really fast, so you don't have to go through doing an
unnecessary query - you just pay your cost at write time, possibly
asynchronously.

On Tue, May 4, 2010 at 12:14 PM, Philip Tucker  wrote:

> I don't think duplicating the data won't work because then I'll be
> doing 2 writes for every turn of the game, and I need that to be fast.
> I don't mind if fetching a user's game list is a little bit slow, but
> 5-20 seconds is too much. I can denormalize all the data such that
> Game 2 fields for each entry in PlayerGameState if that helps, but I'd
> still like to know why it's so slow now.
>
> I do have appstat installed. For one particular misbehaving request,
> the query fetches 5 PlayerGameState records. It iterates through the
> first 4 taking ~20 ms each, then I see a RunQuery taking 8 seconds.
>
> I don't see an easy way to export appstat data, but I can include more
> details if necessary.
>
> Here's the query code in question.
>
>Set myUserCache = Sets.newHashSet();
>Query query = pm.newQuery(PlayerGameState.class);
>query.declareParameters(
>"com.google.appengine.api.datastore.Key userKeyParam");
>query.setFilter("userKey == userKeyParam");
>List playerStates =
>(List) query.execute(playerKey);
>List games = Lists.newArrayList();
>for (PlayerGameState playerState : playerStates) {
>  Game game = playerState.getGame();
>  myUserCache.add(game.getPlayerState().getUserKey());
>  myUserCache.add(game.getOpponentState().getUserKey());
>  games.add(game);
> }
>
>
>
> On May 3, 1:16 am, "Ikai L (Google)"  wrote:
> > Indexes don't work the same way they do in relational databases. If you
> can
> > fetch a value with a query, that likely means an index exists on that
> > property. In a relational database, when an index is not present, the
> > database will do a full table scan.
> >
> > A fetch by Key is always fast. Have you considered storing multiple games
> > inside a single Game instance? Or simply storing the data you need both
> in
> > the Game instances? If you want to cut down on request latency, do as
> many
> > by key gets as possible. Don't try to approach the modeling from a
> > normalization perspective. How many entities are you retrieving? And have
> > you tried looking at what's happening via AppStats yet (
> http://code.google.com/appengine/docs/java/tools/appstats.html)?
> >
> >
> >
> >
> >
> > On Fri, Apr 30, 2010 at 1:54 AM, Philip Tucker 
> wrote:
> > > I've got a Game object that includes two PlayerGameState objects. Both
> > > are persistence-capable. My query fetches all PlayerGameState objects
> > > for a particular user, then I get the associated game and other
> > > player. The initial fetch is always fast, and the entire operation is
> > > generally lass than a second. But periodically, maybe 5 of the time,
> > > it takes much longer, from 5-20 seconds. It's not fetching the
> > > PlayerGameState objects that's slow, it's accessing
> > > PlagerGameState.game and Game.playerStates.
> >
> > > I shouldn't need to add an index on the keys, should I? I'd like to
> > > fetch the Game objects directly but as far as I can tell we can't
> > > query on a joined table; ie, I can't do something like "select from
> > > Game, PlayerGameState join on PlayerGameState.game where
> > > PlayerGameState.userKey == userKeyParam".
> >
> > > @PersistenceCapable(identityType = IdentityType.APPLICATION)
> > > public class Game {
> > >  @PrimaryKey
> > >  @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> > >  private Key key;
> >
> > >  @Persistent(mappedBy = "game")
> > >  @Element(dependent = "true")
> > >  private List playerStates;
> >
> > >  ...
> > > }

[appengine-java] Re: slow responses for query

[Philip Tucker]

I don't think duplicating the data won't work because then I'll be
doing 2 writes for every turn of the game, and I need that to be fast.
I don't mind if fetching a user's game list is a little bit slow, but
5-20 seconds is too much. I can denormalize all the data such that
Game 2 fields for each entry in PlayerGameState if that helps, but I'd
still like to know why it's so slow now.

I do have appstat installed. For one particular misbehaving request,
the query fetches 5 PlayerGameState records. It iterates through the
first 4 taking ~20 ms each, then I see a RunQuery taking 8 seconds.

I don't see an easy way to export appstat data, but I can include more
details if necessary.

Here's the query code in question.

Set myUserCache = Sets.newHashSet();
Query query = pm.newQuery(PlayerGameState.class);
query.declareParameters(
"com.google.appengine.api.datastore.Key userKeyParam");
query.setFilter("userKey == userKeyParam");
List playerStates =
(List) query.execute(playerKey);
List games = Lists.newArrayList();
for (PlayerGameState playerState : playerStates) {
  Game game = playerState.getGame();
  myUserCache.add(game.getPlayerState().getUserKey());
  myUserCache.add(game.getOpponentState().getUserKey());
  games.add(game);
}



On May 3, 1:16 am, "Ikai L (Google)"  wrote:
> Indexes don't work the same way they do in relational databases. If you can
> fetch a value with a query, that likely means an index exists on that
> property. In a relational database, when an index is not present, the
> database will do a full table scan.
>
> A fetch by Key is always fast. Have you considered storing multiple games
> inside a single Game instance? Or simply storing the data you need both in
> the Game instances? If you want to cut down on request latency, do as many
> by key gets as possible. Don't try to approach the modeling from a
> normalization perspective. How many entities are you retrieving? And have
> you tried looking at what's happening via AppStats yet 
> (http://code.google.com/appengine/docs/java/tools/appstats.html)?
>
>
>
>
>
> On Fri, Apr 30, 2010 at 1:54 AM, Philip Tucker  wrote:
> > I've got a Game object that includes two PlayerGameState objects. Both
> > are persistence-capable. My query fetches all PlayerGameState objects
> > for a particular user, then I get the associated game and other
> > player. The initial fetch is always fast, and the entire operation is
> > generally lass than a second. But periodically, maybe 5 of the time,
> > it takes much longer, from 5-20 seconds. It's not fetching the
> > PlayerGameState objects that's slow, it's accessing
> > PlagerGameState.game and Game.playerStates.
>
> > I shouldn't need to add an index on the keys, should I? I'd like to
> > fetch the Game objects directly but as far as I can tell we can't
> > query on a joined table; ie, I can't do something like "select from
> > Game, PlayerGameState join on PlayerGameState.game where
> > PlayerGameState.userKey == userKeyParam".
>
> > @PersistenceCapable(identityType = IdentityType.APPLICATION)
> > public class Game {
> > �...@primarykey
> > �...@persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> >  private Key key;
>
> > �...@persistent(mappedBy = "game")
> > �...@element(dependent = "true")
> >  private List playerStates;
>
> >  ...
> > }
>
> > @PersistenceCapable(identityType = IdentityType.APPLICATION)
> > public class PlayerGameState {
> > �...@suppresswarnings("unused")
> > �...@primarykey
> > �...@persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
> >  private Key key;
>
> > �...@persistent
> >  private Key userKey;
>
> > �...@persistent
> >  private Game game;
>
> >  ...
> > }
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "Google App Engine for Java" group.
> > To post to this group, send email to
> > google-appengine-j...@googlegroups.com.
> > To unsubscribe from this group, send email to
> > google-appengine-java+unsubscr...@googlegroups.com > unsubscr...@googlegroups.com>
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/google-appengine-java?hl=en.
>
> --
> Ikai Lan
> Developer Relations, Google App Engine
> Twitter:http://twitter.com/ikai
> Delicious:http://delicious.com/ikailan
>
> 
> Google App Engine links:
> Blog:http://googleappengine.blogspot.com
> Twitter:http://twitter.com/app_engine
> Reddit:http://www.reddit.com/r/appengine
>
> --
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> For more options, visit this group 
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"Google App Engi

[appengine-java] SimpleDS 1.0_RC1 is out

[Nacho Coloma]

We are really excited with this release, which is the first feature-
complete release of SimpleDS. Lots of things have been included in so
little time.

Getting up-to-date with AppEngine


It's hard to keep up the pace with these guys. This release includes:

* Unindexed attributes.
* Cursors support.
* IN and != clauses.

Cache
=

We have included a great Level 1 and Level 2 cache [1]. If you come
from JDO/JPA, you may already know how it works:

* Level 1 cache: This is basically a Map bound to the current thread.
Until the end of the current request, any get() invocation will check
this cache first. If a match is found, no invocation will be
propagated to GAE.
* Level 2 cache: Datastore entities are also stored in memcache, which
is a second chance to get a positive match.

Cacheable entities must be marked with @Cacheable, with an optional
expiration time. This feature will work with single and batch get(),
and the cache entries are updated with put() and delete()
invocations.

// Invoke memcache or the datastore
List data = entityManager.get(key1, key2, key3);

// this does not invoke anything (resolved by the Level 1 cache)
MyData d2 = entityManager.get(key1);

Functions


We are going extremely functional these days [2]. This release
includes a package with functions to transform collections and
PagedList instances, which can be combined with batch get() to get
even better performance results. This is a simple example, equivalent
to a common situation with relationships:

// n + 1 requests to the datastore
List data = entityManager.find(query);
Collection parents =
Lists.newArrayListwithCapacity(data.size());
for (MyData d : data) {
  parents.add(entityManager.get(d.getKey().getParent());
}

// Transformations: 2 requests
List data = entityManager.find(query);
Collection parentKeys = Collections2.transform(data, new
EntityToParentKeyFunction(MyData.class));
Collection parents = entityManager.get(parentKeys);

That's all it takes to get all entities and their parents, and store
them in the Level 1 cache so any request by PK will not hit memcache
or the datastore. This release includes functions to retrieve parent
and foreign keys, and also works with PagedList. We have taken two
real-world snapshots with just this optimization (transformation +
cacheable), applied to a single loop:

Before: http://www.flickr.com/photos/koliseocom/4575062969/sizes/l/
After: http://www.flickr.com/photos/koliseocom/4575696456/sizes/o

Notice that requests "before" are targeted to the datastore, while
most of the "after" are memcache requests.

Background tasks
==

I know that background tasks [3] are in the roadmap for AppEngine, but
we needed these today. This started as an exercise to upgrade the
datastore schema (add properties, delete entities, etc) and ended up
as a full reusable implementation of tasks that I expect to deprecate
once that AppEngine includes its own, probably better, implementation.

Background tasks require adding a servlet to web.xml (and optionally
appengine-web.xml as an admin-console entry) and configuring the tasks
on application start using plain Java. Tasks can be invoked directly
by cron triggers, queues or by POST requests.

public class WriteBehindCacheTask extends IterableTask {

protected WriteBehindCacheTask() {
super("my-task-id");
}

@Override
protected SimpleQuery createQuery(TaskRequest request) {
return entityManager.createQuery(MyClass.class);
}

@Override
protected void process(MyClass entity, TaskRequest request) {
// ...modify entity...
entityManager.put(entity);
}

}

Query cursors and execution deferral will be done transparently (no
need to limit or handle cursors). There are some implementation
superclasses depending on what you need to do, and some of them just
use the raw AppEngine datastore and don't even require SimpleDS to
work.

This is the first feature-complete release of SimpleDS. Next on the
roadmap: cached queries and we may be revisiting relations.

As always, all kind of feedback is welcome.

Nacho.

[1] http://code.google.com/p/simpleds/wiki/Cache
[2] http://code.google.com/p/simpleds/wiki/Functions
[3] http://code.google.com/p/simpleds/wiki/BackgroundTasks

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[appengine-java] Re: Cache pages in Memcache

[Nacho Coloma]

Hi Sergio,

> I'm thinking in a Filter that put page results in memcache when first
> accessed, and then getting that result in former accesses.

That should work. All page cache implementations do more or less the
same.

> The idea is simple but the implementation is not. (how to get the
> first request response? how to implement proper header management in
> that filter? how to not disable gzip using this?)

* If there is content in memcache, you can deliver it and exit.
Otherwise, let the request proceed, and store in the cache.
* Be sure to set the cache timeout and calculate the cache key
correctly (e.g. include the user ID or the user locale if the cached
contents depend on that).
* For HTTP headers, this presentation may help:
http://www.slideshare.net/icoloma/caching-web-contents-in-the-browser-999134

It's  more or less the same with JSP page fragments (except the
headers, of course). No rocket science.

Cheers,

Nacho.

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Re: [appengine-java] Problems enabling Second-level cache with JPA

[Ikai L (Google)]

If you're able to write a tutorial, it would benefit everyone greatly. We'll
link to it in a community update blog post.

On Tue, May 4, 2010 at 5:05 AM, Sergio Lopes  wrote:

>
> Anyway, just a suggestion... I think it'd be better to GAE community
> to have better tutorials.
>
> --
> Ikai Lan
> Developer Relations, Google App Engine
> Twitter: http://twitter.com/ikai
> Delicious: http://delicious.com/ikailan
>
> 
> Google App Engine links:
> Blog: http://googleappengine.blogspot.com
> Twitter: http://twitter.com/app_engine
> Reddit: http://www.reddit.com/r/appengine
>
> ppengine" target="_blank">http://www.reddit.com/r/appengine

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Re: [appengine-java] Cache pages in Memcache

[Ikai L (Google)]

This is tangential to your question, but have you looked at using the
cache-control header? That is, setting Cache-Control to "public;
max-age=3600;". This'll cause proxy servers between App Engine and your
client to cache the page.

Gzip is handled by Google infrastructure, so this is something you should
never have to worry about since it happens after you have already returned a
response.

I suspect the way to do what you are asking in a filter is to pass a
HttpServletResponse wrapper to doFilter that captures the response somehow
(I am not familiar with how this would work, you may have to consult how
EHCache does it), then places it into Memcache using the URI as a key.


On Mon, May 3, 2010 at 10:39 PM, Sergio Lopes  wrote:

> Hi
>
> Are there anyone using some kind of server-side page cache using
> memcached?
> I'm thinking in a Filter that put page results in memcache when first
> accessed, and then getting that result in former accesses.
>
> The idea is simple but the implementation is not. (how to get the
> first request response? how to implement proper header management in
> that filter? how to not disable gzip using this?)
>
> I tried Ehcache with the Web Module (https://groups.google.com/group/
> google-appengine-java/browse_thread/thread/7cfa0eae3bc26444) but it's
> not working.
>
> Maybe someone here has an idea on how to implement an effective page
> cache using Java
>
> Tks
> Sérgio
>
> --
> You received this message because you are subscribed to the Google Groups
> "Google App Engine for Java" group.
> To post to this group, send email to
> google-appengine-j...@googlegroups.com.
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> .
> For more options, visit this group at
> http://groups.google.com/group/google-appengine-java?hl=en.
>
>


-- 
Ikai Lan
Developer Relations, Google App Engine
Twitter: http://twitter.com/ikai
Delicious: http://delicious.com/ikailan


Google App Engine links:
Blog: http://googleappengine.blogspot.com
Twitter: http://twitter.com/app_engine
Reddit: http://www.reddit.com/r/appengine

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[appengine-java] Re: VerifyError on no-op default constructor

[Attila Szegedi]

I made a new version of the freemarker.jar, with a workaround for this
problem.

Download link for new freemarker JAR: 

The workaround will delay loading of the
FreeMarkerJspApplicationContext class as long as possible. It will now
let the JSP taglibs work in FreeMarker on GAE as long as the custom
JSP tags are not trying to use either
JspFactory.getJspApplicationContext() or PageContext.getELContext(). I
expect majority of taglibs out there fall into this category; those
that do rely on this functionality though are, for the time being, out
of luck - until GAE allows our class that implements
JspApplicationContext through the verifier.

Don, since this workaround is only partial, the ultimate solution
would be to let our FreeMarkerJspApplicationContext through the
verifier. Do you see any problem with that going forward?

Thanks,
  Attila.

On May 3, 5:54 pm, Don Schwarz  wrote:
> I suspect that this is due to the way we make
> javax.servlet.jsp.JspApplicationContext available to application code but do
> not currently make javax.el.* available.  Thus, the javax.el.ELResolver
> class that you are providing in your application is not the same class that
> your JspApplicationContext implementation should reference.
>
> I don't know that there is anything you can do in your application to work
> around this for the moment (short of not implementing the
> JspApplicationContext interface), but coincidentally we are already planning
> to fix this in an upcoming release.
>
> If you can provide me with a compiled war directory for your test
> application (either privately or by attaching to the bug), I can determine
> whether our solution will work for your case as well.
>
> On Mon, May 3, 2010 at 8:45 AM, Sudhir Ramanandi wrote:
>
>
>
> > Google, atleast speak, *what does this exception mean, *then I can fix the
> > freemarker code.
>
> > SN
>
> > On Fri, Apr 30, 2010 at 10:57 AM, Sudhir Ramanandi 
> > wrote:
>
> >> If the issue can't be fixed, can any one explain this strange behavior
> >> atlest ! thn we can fix our code.
>
> >> Thanks
> >> SN
>
> >> On Wed, Apr 28, 2010 at 11:06 AM, Sudhir Ramanandi 
> >> wrote:
>
> >>> Can anyone from google explain what
> >>> java.lang.VerifyError: (class:
> >>> freemarker/ext/jsp/FreeMarkerJspApplicationContext, method: 
> >>> signature: ()V) Incompatible argument to function, means?
>
> >>> See the issue
> >>>http://code.google.com/p/googleappengine/issues/detail?id=3157
>
> >>> I have attached the source of class FreeMarkerJspApplicationContext here.
>
> >>> The line that throws above error is "FreeMarkerJspApplicationContext.
> >>> class.getName();"
>
> >>> What's wrong with this class? The class doesn't seems to have any thing
> >>> unusual. Why this weird behavior?
>
> >>> Seems google will never let freemarker to run on GAE
>
> >>> Thanks
> >>> SN
>
> >> --
> >> Sudhir Ramanandi
> >>http://www.ramanandi.org
>
> > --
> > Sudhir Ramanandi
> >http://www.ramanandi.org
>
> > --
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Re: [appengine-java] Servlet request parameters empty

[Stephan Hartmann]

if you want to get your data as request parameter, you should use "GET"
instead of "POST" and /or let the default contentType
"application/x-www-form-urlencoded" and create your json object as either

var json = {name: "test"};  // and let jquery convert it to a query
string
or
var json = "name=test";   // the desired query string

regards,
Stephan


2010/5/4 Rob 

> I'm running Google App Engine through IntelliJ Idea and am posting
> data to a Servlet using jQuery.ajax. I'm hitting the Servlet without
> issue and can return data in the response, however, the request
> parameters are always null; I cant seem to POST data. Where am I going
> wrong?
>
> var json = JSON2.stringify({name: "test"});
>
> $.ajax({
>type: "POST",
>url: service,
>data: json,
>contentType: "application/json; charset=utf-8",
>dataType: "json",
>async: async,
>success: function(o) {
> o = $.serviceHelper.jsonSerialize(o);
>   callback(o);
>},
>error: this.dataServiceError
>});
>
>protected void doPost(javax.servlet.http.HttpServletRequest
> request, javax.servlet.http.HttpServletResponse response) throws
> javax.servlet.ServletException, IOException {
>
>PrintWriter out = response.getWriter();
>response.setContentType("text/json");
>String json = gson.toJson(request.getParameter("name"));
>out.println(json);
>
>}
>
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Re: [appengine-java] Re: Cron maintenance NOW, Sun 5/2 9-11p PDT

[Ikai L (Google)]

No, this maintenance should have not changed any behavior.

On Mon, May 3, 2010 at 8:28 PM, Millisecond  wrote:

> Were there any changes in behavior as a result of this work?
>
> Thought I'd heard something about long running (>1s) cron jobs no
> longer interfering with user-generated requests but don't see any
> documentation of this related to last night's work.
>
> Thanks,
> -Casey
>
> On May 2, 9:13 pm, "Wesley C (Google)" 
> >
> wrote:
> > This is an alert that the planned cron maintenance is happening now. If
> you
> > want to be notified of planned/scheduled downtimes, please subscribe to
> the
> > read-only list athttp://
> groups.google.com/group/google-appengine-downtime-notify... you can
> > go there now to subscribe as well as get more information on tonight's
> cron
> > outage.
> >
> > thanks,
> > -- wesley
> > - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> > "Core Python Programming", Prentice Hall, (c)2007,2001
> > "Python Fundamentals", Prentice Hall, (c)2009
> >http://corepythonprogramming.com
> >
> > wesley.j.chun :: w...@google.com
> > developer relations :: google app engine
> > @app_engine :: googleappengine.blogspot.com
> >
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Re: [appengine-java] Serialization Error on GData Spreadhseet

[Ikai L (Google)]

Are you storing something in the session, such as an instance of the GData
client?

On Mon, May 3, 2010 at 7:20 PM, Rudolf wrote:

> Hello,
>
> I am new on Google App Engine;
>
> I wrote some code which accesses a Google Spreadsheet through the
> provided GData Java API;
>
> everythings works well running in the Eclipse local Environment or
> running the code on a local Apache Tomcat Server;
>
> nevertheless, running the code on the Google App Engine (deployed
> through Elipse) fails with the following error:
> Error: Server Error
> The server encountered an error and could not complete your request.
> If the problem persists, please report your problem and mention this
> error message and the query that caused it.
>
> the App Engine log gives me the following information:
> Uncaught exception from servlet
> java.lang.RuntimeException: java.io.NotSerializableException:
> com.google.gdata.client.spreadsheet.SpreadsheetService
>at
>
> com.google.apphosting.runtime.jetty.SessionManager.serialize(SessionManager.java:
> 361)
>at
>
> com.google.apphosting.runtime.jetty.SessionManager.createEntityForSession(SessionManager.java:
> 341)
> ...
>
> Any idea what I am doing wrong;
>
> thank you in advance for your help;
>
> Best Regards
> Rudolf
>
> --
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Re: [appengine-java] Fileupload Tutorial?

[Ikai L (Google)]

Here's some abandonware I wrote a while ago that does file upload using
Apache Commons File Upload:

http://github.com/ikai/DateEngine/blob/master/src/com/dateengine/controllers/PhotoServlet.java

Not
sure how this would work with GWT, though.

On Mon, May 3, 2010 at 8:04 PM, Raphael  wrote:

> Hi
> I'm really new to the whole GAE stuff. I've used Java, but always for
> desktop stuff, so for the past couple years I was mostly doing PHP for
> all my Web programming. Well, I decided to see how Java does and the
> GAE seemed just a really nice playground, but here come the problems.
> No clue of the whole servlet stuff.
>
> So short thing. I managed my way around. I'm though looking now for a
> simple fileupload tutorial with GWT/GAE. Does anybody know a good
> source?
>
> Thanks a lot
> Raphael
>
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Re: [appengine-java] payment gateway integrations with appengine

[romesh soni]

Yup Paypal works in India and its easy to integrate.

On Tue, May 4, 2010 at 2:25 PM, Ikai L (Google)  wrote:

> Does Paypal work in India? They have an API for developers:
>
> https://developer.paypal.com/
>
> From what I've heard, their Java client may not work out of the box with
> App Engine, though.
>
> On Mon, May 3, 2010 at 11:54 AM, aswath satrasala <
> aswath.satras...@gmail.com> wrote:
>
>> Hello,
>> I looked into google-checkout, but it is currently for US & Europe only.
>> I am looking to be able to bill the customer in Rupees, and hence would
>> like to integrate with indian payment gateway systems into the appengine
>> app.
>> Any experiences on this
>>
>> Thanks
>> -Aswath
>>
>> --
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>> .
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>> http://groups.google.com/group/google-appengine-java?hl=en.
>>
>
>
>
> --
> Ikai Lan
> Developer Relations, Google App Engine
> Twitter: http://twitter.com/ikai
> Delicious: http://delicious.com/ikailan
>
> 
> Google App Engine links:
> Blog: http://googleappengine.blogspot.com
> Twitter: http://twitter.com/app_engine
> Reddit: http://www.reddit.com/r/appengine
>
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Re: [appengine-java] payment gateway integrations with appengine

[Ikai L (Google)]

Does Paypal work in India? They have an API for developers:

https://developer.paypal.com/

>From what I've heard, their Java client may not work out of the box with App
Engine, though.

On Mon, May 3, 2010 at 11:54 AM, aswath satrasala <
aswath.satras...@gmail.com> wrote:

> Hello,
> I looked into google-checkout, but it is currently for US & Europe only.
> I am looking to be able to bill the customer in Rupees, and hence would
> like to integrate with indian payment gateway systems into the appengine
> app.
> Any experiences on this
>
> Thanks
> -Aswath
>
> --
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[appengine-java] Re: An entity group whose parent uses an unencoded String primary key?

[Ian Marshall]

To answer your questions, why not try something like the code snippet
below?

Cheers,

Ian


@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = "true")
public class User
{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String sEncodedKey;

/*
// This is optional, but I use it.
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-id", value="true")
private Long loKeyID;
*/

/*
// This is optional.
// One cannot define both a "gae.pk-id" and a "gae.pk-name" in the
same class.
@Persistent
@Extension(vendorName="datanucleus", key="gae.pk-name", value="true")
private String sKeyName;
*/

// Even though this field is an array list, the accessor methods
// for this field treat the relationship of this class with the child
class
// as 1-1 (not 1-N).
// This is a work-around for datanucleus-appengine issue 165: "
// Relation.ONE_TO_ONE_BI NPE
postInsert(PersistenceCapableMapping.java:1039)"
@Persistent(mappedBy="userParent")
@Element(dependent="true")
@Order(extensions = @Extension(vendorName="datanucleus", key="list-
ordering",
 value="sEncodedKey ASC"))
private ArrayList faFavAnimals = new
ArrayList();

public FavAnimal getFavAnimal()
{
FavAnimal faFavAnimal = null;

if ((faFavAnimals != null) && (!faFavAnimals.isEmpty()))
faFavAnimal = faFavAnimals.get(0);

return faFavAnimal;
}

public void setFavAnimal(FavAnimal favAnimal)
{
if (faFavAnimals == null)
faFavAnimals = new ArrayList();

if (!faFavAnimals.isEmpty())
faFavAnimals.clear();

if (faFavAnimals != null)
faFavAnimals.add(favAnimal);
}

...
}

@PersistenceCapable(identityType = IdentityType.APPLICATION,
detachable = "true")
public class FavAnimal
{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
private String sEncodedKey;

@Persistent(dependent="false")
private User userParent;

...
}


FavAnimal fa = new FavAnimal();
user.setFavAnimal(fa);
fa.setUserParent(user);
pm.makePersistent(fa);

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[appengine-java] Re: indexes

[Philip Tucker]

Thanks. By "table" I mean annotated Java class. One reason I was
confused about the indexes is I don't see many of the ones I would
expect when I navigate to https://appengine.google.com/datastore/indexes,
but I guess they must exist or my queries would be failing.

On Apr 30, 2:16 pm, Tristan  wrote:
> uhm... read the next section?
>
> http://code.google.com/appengine/docs/java/datastore/queriesandindexe...
>
> as far as indexes getting applied to existing tables... (not sure by
> what you mean by "table"), but yes, that's why when you upload new
> index it is "building", it's being applied to existing stuff.
>
> On Apr 30, 12:54 am, Philip Tucker  wrote:
>
>
>
>
>
> > According to this, "The App Engine datastore maintains an index for
> > every query an application intends to make."
>
> >http://code.google.com/appengine/docs/java/datastore/queriesandindexe...
>
> > Does GAE just scan the app Java code for Query.setFilter, or do we
> > need to do annotate queries for these indexes to be generated.
>
> > Also, it appears new indexes do not get applied to existing tables
> > when we deploy application code with new queries or @INDEX annotations
> > - is this correct? Is there a way to do that, or are we required to
> > create a new table and copy the data over?
>
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Re: [appengine-java] How to make BlobServlet send non-empty response?

[bimbo jones]

hi,

You can redirect the upload servlet to another servlet that responds.

2010/5/3 Jaroslav Záruba 

> I'm trying to use SWFUpload for uploading images in my application but
> either this particular component or Flash does not like empty
> responses.
> Is it possible somehow to get any content in the response-body from
> uploadUrl?
>
> Regards
>  J. Záruba
>
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Re: [appengine-java] one project access classes in another project in same account

[Patrick Cornelißen]

Hi!

2010/5/4 bhomass :
> using tomcat, I have been able to have one central web app access
> classes from surrounding web apps by simply using URLClassLoader based
> on the file path of the class folder.
>
> is there a way to do the same once I deploy to GAE?

I don't think that this is allowed, as different GAE apps are not
allowed to act as one app and this is really going into that
direction.

So I think it's technically possible, but not allowed.


-- 
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  http://www.openprojectguide.org
  http://www.pcornelissen.de http://code.google.com/p/gloudy/

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Re: [appengine-java] 500 Internal Server Error

[Pieter Coucke]

It seems to fail on the cron upload.  Have you checked your cron.xml syntax?

My problem was that I had "every day 01:00 synchronized".  Removing
"synchronize" resolved the issue.
Also try with "every 1 minutes synchronized" instead of "every 1 minute
synchronized".
This did work for me without errors on de dev server.

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[appengine-java] one project access classes in another project in same account

[bhomass]

using tomcat, I have been able to have one central web app access
classes from surrounding web apps by simply using URLClassLoader based
on the file path of the class folder.

is there a way to do the same once I deploy to GAE?

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[appengine-java] Re: Unowned relationship confusion

[dau...@googlemail.com]

Just my 2 cents: I was "forced" to use an "unowned relationship" for
my application because I had very large objects: My parent object
"Journey" contained thousands of "JourneyPoints" in a List element. A
call to "makePersistent" constantly hit the 30s deadline. By modeling
it as an unowned relationship and distributing the parent key by hand
to the JourneyPoints everything was fine again and the performance was
very good.

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[appengine-java] Servlet request parameters empty

[Rob]

I'm running Google App Engine through IntelliJ Idea and am posting
data to a Servlet using jQuery.ajax. I'm hitting the Servlet without
issue and can return data in the response, however, the request
parameters are always null; I cant seem to POST data. Where am I going
wrong?

var json = JSON2.stringify({name: "test"});

$.ajax({
type: "POST",
url: service,
data: json,
contentType: "application/json; charset=utf-8",
dataType: "json",
async: async,
success: function(o) {
 o = $.serviceHelper.jsonSerialize(o);
   callback(o);
},
error: this.dataServiceError
});

protected void doPost(javax.servlet.http.HttpServletRequest
request, javax.servlet.http.HttpServletResponse response) throws
javax.servlet.ServletException, IOException {

PrintWriter out = response.getWriter();
response.setContentType("text/json");
String json = gson.toJson(request.getParameter("name"));
out.println(json);

}

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[appengine-java] Re: Bouncy Castle 3party jars no longer loaded?

[dau...@googlemail.com]

On May 1, 12:50 pm, Nichole  wrote:
> Hello,
>
>    Are there changes to the allowed use of Bouncy Castle as a 3rd
> party library in SDK 1.3.3?
>
> I'm now getting an exception SHA1 digest error for org/bouncycastle/
> crypto/paddings/BlockCipherPadding.class which suggests that
> BouncyCastle is still being used,
> but classes in my app that use bouncy castle are not reporting their
> log statements.
> I added quite a bit of logging so see it drop off right before the
> first class using bouncy
> castle.  I even added a static method to a BC using class just to
> report that it was reached.
> I asserted that the classes are present in the web app with JarFile
> and JarEntry too.
>
>    Have the classes suddenly been blacklisted, but a runtime exception
> isn't reported?
>
>   Note that when I first noticed this last week, I repackaged my app
> and redeployed it a few
> times and it was successfully using Bouncy Castle again for that day,
> but the problem has
> returned.
>
>    Thanks for your time,
>        Nichole
>
> --

May I ask how you managed to use the BC API at all? I didn't success
in loading the BC API because of the restrictions of the
Security.addProvider() call.

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[appengine-java] 500 Internal Server Error

[付平 戚]

Closing update: new version is ready to start serving.
Uploading index definitions.
Uploading cron jobs.
java.io.IOException: Error posting to URL:
https://appengine.google.com/api/datastore/cron/update?app_id=seven3xx&version=1&;
500 Internal Server Error

Unable to update:
java.io.IOException: Error posting to URL:
https://appengine.google.com/api/datastore/cron/update?app_id=seven3xx&version=1&;
500 Internal Server Error

Server Error (500)
A server error has occurred.

at
com.google.appengine.tools.admin.ServerConnection.send(ServerConnection.java:
149)
at
com.google.appengine.tools.admin.ServerConnection.post(ServerConnection.java:
82)
at
com.google.appengine.tools.admin.AppVersionUpload.send(AppVersionUpload.java:
559)
at
com.google.appengine.tools.admin.AppVersionUpload.updateCron(AppVersionUpload.java:
260)
at
com.google.appengine.tools.admin.AppVersionUpload.doUpload(AppVersionUpload.java:
133)
at
com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:
56)
at
com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:
271)
at
com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:
145)
at
org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:
38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

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[appengine-java] 500 Server Error

[Alexander Gavrilov]

Hello, GWT Gurus!

I am frequently getting 500 Server error, when application is running
on appspot, not locally. It is usually happens after application has
been just deployed or after a couple of hours I haven't touched it,
while it was running in browser.

In logs I get this exception:

#
com.google.inject.internal.FinalizableReferenceQueue$SystemLoader
loadFinalizer: Not allowed to access system class loader.

#
05-03 10:58PM 53.370
com.google.inject.internal.FinalizableReferenceQueue : Failed to
start reference finalizer thread. Reference cleanup will only occur
when new references are created.
java.lang.reflect.InvocationTargetException
at com.google.appengine.runtime.Request.process-
a34bf020cfbce66a(Request.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Method.java:43)
at
com.google.inject.internal.FinalizableReferenceQueue.(FinalizableReferenceQueue.java:
124)
at com.google.inject.internal.MapMaker
$QueueHolder.(MapMaker.java:787)
at com.google.inject.internal.MapMaker$WeakEntry.(MapMaker.java:
946)
at com.google.inject.internal.MapMaker$Strength
$1.newEntry(MapMaker.java:312)
at com.google.inject.internal.MapMaker
$StrategyImpl.newEntry(MapMaker.java:498)
at com.google.inject.internal.MapMaker
$StrategyImpl.newEntry(MapMaker.java:419)
at com.google.inject.internal.CustomConcurrentHashMap
$ComputingImpl.get(CustomConcurrentHashMap.java:2029)
at
com.google.inject.internal.BytecodeGen.getClassLoader(BytecodeGen.java:
149)
at
com.google.inject.internal.BytecodeGen.getClassLoader(BytecodeGen.java:
132)
at
com.google.inject.internal.BytecodeGen.newFastClass(BytecodeGen.java:
162)
at com.google.inject.internal.DefaultConstructionProxyFactory
$1.(DefaultConstructionProxyFactory.java:52)
at
com.google.inject.internal.DefaultConstructionProxyFactory.create(DefaultConstructionProxyFactory.java:
50)
at com.google.inject.internal.ProxyFactory.create(ProxyFactory.java:
147)
at
com.google.inject.internal.ConstructorInjectorStore.createConstructor(ConstructorInjectorStore.java:
75)
at com.google.inject.internal.ConstructorInjectorStore.access
$000(ConstructorInjectorStore.java:27)
at com.google.inject.internal.ConstructorInjectorStore
$1.create(ConstructorInjectorStore.java:35)
at com.google.inject.internal.ConstructorInjectorStore
$1.create(ConstructorInjectorStore.java:31)
at com.google.inject.internal.FailableCache
$1.apply(FailableCache.java:35)
at com.google.inject.internal.MapMaker
$StrategyImpl.compute(MapMaker.java:549)
at com.google.inject.internal.MapMaker
$StrategyImpl.compute(MapMaker.java:419)
at com.google.inject.internal.CustomConcurrentHashMap
$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
at com.google.inject.internal.FailableCache.get(FailableCache.java:
46)
at
com.google.inject.internal.ConstructorInjectorStore.get(ConstructorInjectorStore.java:
48)
at
com.google.inject.internal.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:
113)
at
com.google.inject.internal.InjectorImpl.initializeBinding(InjectorImpl.java:
367)
at
com.google.inject.internal.InjectorImpl.createJustInTimeBinding(InjectorImpl.java:
619)
at
com.google.inject.internal.InjectorImpl.createJustInTimeBindingRecursive(InjectorImpl.java:
551)
at
com.google.inject.internal.InjectorImpl.getJustInTimeBinding(InjectorImpl.java:
162)
at
com.google.inject.internal.InjectorImpl.getBindingOrThrow(InjectorImpl.java:
122)
at
com.google.inject.internal.InjectorImpl.getInternalFactory(InjectorImpl.java:
625)
at com.google.inject.internal.FactoryProxy.notify(FactoryProxy.java:
43)
at
com.google.inject.internal.BindingProcessor.runCreationListeners(BindingProcessor.java:
235)
at
com.google.inject.internal.InjectorBuilder.initializeStatically(InjectorBuilder.java:
132)
at
com.google.inject.internal.InjectorBuilder.build(InjectorBuilder.java:
106)
at com.google.inject.Guice.createInjector(Guice.java:93)
at com.google.inject.Guice.createInjector(Guice.java:70)
at com.google.inject.Guice.createInjector(Guice.java:60)
at
com.myapp.DispatcherServletContextListener.getInjector(DispatcherServletContextListener.java:
16)
at
com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:
43)
at
org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:
548)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
at
org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:
1250)
at
org.mortbay.

[appengine-java] Re: backup and restore options

[dau...@googlemail.com]

> I found some info on how to enable the remote API for GAE/J
>applications by setting up the RemoteServlet in the application's
>web.xml and then you should be able to use the bulkloader.py tool from
>the python sdk to do backup/restore operation on the datastore of a
>GAE/J app.
>  I've added the remote API servlet in the web.xml, deployed it and
>the remote API seems to be active since I get the "This request did
>not contain a necessary header" message in the browser. However when

Could you please describe how you managed to accomplish this?

Thanks,
Markus

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Re: [appengine-java] Re: Inequality Filters Are Allowed On One Property Only

[romesh soni]

Hi Tristan,

Really appreciate the logic you suggested.  But consider this case:

There are only two intervals in db: x1 = 4   y1 = 70   and  x2 = 71   y2 =
75.

I want to search by 76. The 76 doesn't fall in any category but still the
query will return the second interval, which is not correct.
Instead the query should say that there is no matching interval. Am I
correct?

Regards
Romesh

On Tue, May 4, 2010 at 11:09 AM, Tristan Slominski <
tristan.slomin...@gmail.com> wrote:

> in that case the solution to your dilemma is as follows
>
> query.addFilter("x", FilterOptions.LESS_THAN, z);
> query.addSort("x", SortOrder.DESC);
>
> then execute the query with a limit of 1
> that is the answer you seek
>
> in other words...
>
> assume you have two intervalsx1 = 4   y1 = 70   and  x2 = 71   y2 = 75.
> you want to find interval that matches your condition ofx < 74 < y
>
> add filter for x less than 74 will give you two results where x1=4 in first
> result and x2=71 in second result
> now sort these results descending so that x2 is the first result   x2=71
> x1=4
> set limit of 1 gives your query a result of x2
>
> you don't need property y
>
> does that work for you?
>
> On Mon, May 3, 2010 at 22:45, romesh soni  wrote:
>
>> Hi Tristan,
>>
>> You got a good catch. But the code which populates the data will never let
>> this happen. If there is a pair x = 4 and y = 10, then there will be no such
>> other pair which consist values between 4 and 10. there will be one and only
>> one set for values 4,5,6,7,8,9,10 and that will be (4,10). I hope my
>> explanation is helpful. So it is guaranteed of having one solution per
>> query.
>>
>> On Mon, May 3, 2010 at 7:31 PM, Tristan Slominski <
>> tristan.slomin...@gmail.com> wrote:
>>
>>> Hey, so I've been thinking about the problem description... you mentioned
>>> that there will ever only be one solution for the query, but that doesn't
>>> seem like a valid constraint. For example, let x = 4 and y = 10, let x2 = 5
>>> and y2 = 11.  The value of z = 6 will result in two solutions.
>>>
>>> The reason I am asking, is that the contraint of only one solution
>>> existing suggest a different mapping of solutions than the one you suggested
>>> (not sure what that different approach would be yet, but it could be
>>> something along the lines of enumerating the intervals).
>>>
>>> Can you guarantee the constraint of only one solution per query?
>>>
>>> On May 3, 2010 3:01 AM, "romesh soni"  wrote:
>>>
>>> Hi Thomas,
>>>
>>> the possible value of x and y can be 2020 and 203204206207.
>>> do you see that it is possible to make such thing in 5000 element
>>> limitation. Are you talking of ArrayList?
>>>
>>> Your solution is good for small list, but I am afraid that it will not
>>> suit my requirement..
>>>
>>>
>>>
>>>
>>> On Mon, May 3, 2010 at 1:00 PM, Thomas  wrote:
>>> >
>>> > Hi romesh:
>>> >
>>> >Datastor...
>>>
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>>>
>>
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>>
>
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