date:20100427

I am using freemarker-gae-pre2.jar and I get following error when I deploy
to GAE. Its working fine on my local machine
I am using spring MVC + freemarker.

java.lang.VerifyError: (class:
freemarker/ext/jsp/FreeMarkerJspApplicationContext, method: init
signature: ()V) Incompatible argument to function
at 
com.google.appengine.runtime.Request.process-814a4fa105eb62da(Request.java)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:109)
at 
freemarker.ext.jsp.FreeMarkerJspFactory21.class$(FreeMarkerJspFactory21.java:13)
at 
freemarker.ext.jsp.FreeMarkerJspFactory21.clinit(FreeMarkerJspFactory21.java:12)
at 
freemarker.ext.jsp.FreeMarkerPageContext21.clinit(FreeMarkerPageContext21.java:30)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:109)
at 
freemarker.ext.jsp.PageContextFactory.getPageContextImpl(PageContextFactory.java:21)
at 
freemarker.ext.jsp.PageContextFactory.clinit(PageContextFactory.java:15)
at 
freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:99)
at freemarker.core.Environment.visit(Environment.java:286)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Macro$Context.runMacro(Macro.java:172)
at freemarker.core.Environment.visit(Environment.java:603)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:106)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:256)
at 
org.springframework.web.servlet.view.freemarker.FreeMarkerView.processTemplate(FreeMarkerView.java:366)
at 
org.springframework.web.servlet.view.freemarker.FreeMarkerView.doRender(FreeMarkerView.java:283)
at 
org.springframework.web.servlet.view.freemarker.FreeMarkerView.renderMergedTemplateModel(FreeMarkerView.java:233)
at 
org.springframework.web.servlet.view.AbstractTemplateView.renderMergedOutputModel(AbstractTemplateView.java:167)
at 
org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250)
at 
org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1060)
at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:798)
at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:693)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at 
com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97)
at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at 
com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at 
com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at 
org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at 
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at 
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at 
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at 
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:238)
at 
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at 
org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at 
org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at 
com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at

Re: [appengine-java] Freemarker: Run local: OK. Run on cloud: Error

Aah, freemarker-gae-pre2.jar won't work either. I got the same error.
Asked to freemarker mailing list. Lets see what comes up.

Does any one else has any idea?

Thanks
SN

On Tue, Apr 27, 2010 at 11:29 AM, Sudhir Ramanandi sramana...@gmail.comwrote:

First of all, Currently normal release of freemarker will not run on GAE as
it has dependency on javax.swing package
If you solve the problem you just mentioned, sooner or later you will get
other problems

See this
http://solveme.wordpress.com/2009/12/25/freemarker-sucks-it-has-dependency-on-javax-swing/

You will have to download a GAE compatible version of freemarker. see above
link for download link.

Thanks
SN

On Tue, Apr 27, 2010 at 8:31 AM, Phuong Nguyen phuongn...@gmail.comwrote:

Hi guys:
I'm having spring-mvc + apache tiles + freemarker in my Gae
Application.
Everything works fine in my local machine after several nightmare of
trying to figuring out the appropriate version of apache tiles to use.

I can recall that I had it successfully run on the cloud few months
ago (when the latest version of sdk is still 1.3.1)

Funny thing is that, after several improvements and adaptation, I'm
now at 1.3.3.1 and my app work fine on local server. However, when I
upload it onto the cloud, here is what I got:

java.lang.VerifyError: (class: freemarker/ext/jsp/
FreeMarkerJspApplicationContext, method: init signature: ()V)
Incompatible argument to function
at

com.google.appengine.runtime.Request.process-5cb3cd85ccb06a68(Request.java)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:109)
at freemarker.ext.jsp.FreeMarkerJspFactory21.class$
(FreeMarkerJspFactory21.java:13)
at

freemarker.ext.jsp.FreeMarkerJspFactory21.clinit(FreeMarkerJspFactory21.java:
12)
at

freemarker.ext.jsp.FreeMarkerPageContext21.clinit(FreeMarkerPageContext21.java:
29)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:109)
at
freemarker.ext.jsp.PageContextFactory.clinit(PageContextFactory.java:
26)
at
freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:
99)
at freemarker.core.Environment.visit(Environment.java:286)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at
freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:
452)
at
freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:
391)

I'm dying. How on earth? I would probably get fired tomorrow.

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Re: [appengine-java] Freemarker: Run local: OK. Run on cloud: Error

Aah, freemarker-gae-pre2.jar won't work either. I got the same error.
Asked to freemarker mailing list. Lets see what comes up.

Does any one else has any idea?

Thanks
SN

On Tue, Apr 27, 2010 at 11:29 AM, Sudhir Ramanandi sramana...@gmail.comwrote:

See this
http://solveme.wordpress.com/2009/12/25/freemarker-sucks-it-has-dependency-on-javax-swing/

You will have to download a GAE compatible version of freemarker. see above
link for download link.

Thanks
SN

On Tue, Apr 27, 2010 at 8:31 AM, Phuong Nguyen phuongn...@gmail.comwrote:

I can recall that I had it successfully run on the cloud few months
ago (when the latest version of sdk is still 1.3.1)

Funny thing is that, after several improvements and adaptation, I'm
now at 1.3.3.1 and my app work fine on local server. However, when I
upload it onto the cloud, here is what I got:

java.lang.VerifyError: (class: freemarker/ext/jsp/
FreeMarkerJspApplicationContext, method: init signature: ()V)
Incompatible argument to function
at

freemarker.ext.jsp.FreeMarkerJspFactory21.clinit(FreeMarkerJspFactory21.java:
12)
at

I'm dying. How on earth? I would probably get fired tomorrow.

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[appengine-java] Owned one to many relationship problem when parent was already existed.

2010-04-27 Thread ylmz

Hi.

I got tree classes that has one-to-many relationship with each other.
A has a child class B (one to many)
B has a child class C(one to many)

@PersistenceCapable
class A {
@PrimaryKey
@Persistent
public Key key;
@Persistent(mappedBy = a)
@Element(dependent = true)
public ListB bList = new ArrayListB();
}

@PersistenceCapable
class B {
@PrimaryKey
@Persistent
public Key key;
@Persistent(mappedBy = b)
@Element(dependent = true)
public ListC cList = new ArrayListC();
@Persistent
public A a;
}

@PersistenceCapable
class C {
@PrimaryKey
@Persistent
public Key key;
@Persistent
public B b;
}

and here is my sample code. code does following steps
1)Create an A instance and persist it if it does not exist in
datastore
2)get A from DB and add B to its list
3) get B from DB and add C to its list
4) delete B and C from DB

PersistenceManager pm = PMF.get().getPersistenceManager();

A a = null;
B b = null;
C c = null;

//1)If A does not exist persist A
try{
a = pm.getObjectById(A.class,A);//check if A exist
}catch(Exception e){
try {
pm.currentTransaction().begin();
a = new A();
a.key = new
KeyFactory.Builder(A.class.getSimpleName(),A).getKey();
pm.makePersistent(a);
pm.currentTransaction().commit();
log.info(New a was created);
} finally {
if(pm.currentTransaction().isActive())
pm.currentTransaction().rollback();
}
}
log.info(id of a is  + a.key);
//2)get A from DB and add B to its list
try {
pm.currentTransaction().begin();
A newA = pm.getObjectById(A.class,A);
b = new B();
b.key = new
KeyFactory.Builder(newA.key).addChild(B.class.getSimpleName(),
B).getKey();
newA.bList.add(b);
pm.currentTransaction().commit();
log.info(New b was created);
} finally {
if(pm.currentTransaction().isActive())
pm.currentTransaction().rollback();
}
log.info(Key of b  + b.key);
//3) get B from DB and add C to its list
pm.currentTransaction().begin();
try {
Key bKey  = new 
KeyFactory.Builder(A.class.getSimpleName(),
A).addChild(B.class.getSimpleName(), B).getKey();
B newB = 
pm.getObjectById(B.class,bKey);//--Error we
cannot retrieve B
c = new C();
c.key = new
KeyFactory.Builder(newB.key).addChild(C.class.getSimpleName(),
C).getKey();
newB.cList.add(c);
pm.currentTransaction().commit();
log.info(New c was created);
} finally {
if(pm.currentTransaction().isActive())
pm.currentTransaction().rollback();
}
//4) delete B and C from DB
pm.currentTransaction().begin();
try {
C newC = pm.getObjectById(C.class,c.key);
pm.deletePersistent(newC);
B newB = pm.getObjectById(B.class,b.key);
pm.deletePersistent(newB);
pm.currentTransaction().commit();
log.info(b and c was deleted);
} finally {
if(pm.currentTransaction().isActive())
pm.currentTransaction().rollback();
}

first time I run this code it works. here is my log messages

INFO: New a was created
INFO: id of a is A(A)
INFO: New b was created
INFO: Key of b A(A)/B(B)
INFO: New c was created
INFO: b and c was deleted

it creates a new A , B and C then in step 4 it deletes B and C
when I run it second time I get following an error message

javax.jdo.JDOObjectNotFoundException: Could not retrieve entity of
kind B with key A(A)/B(B)

Problem is, if my parent(A) is already in datastore I cannot add a new
child(B).
I dont get any error at step2. It seems like B is persisted correctly
but when I try to retrive it at step 3( with code
pm.getObjectById(B.class,bKey) at line 3 of this step)
I cannot retrieve it. and when I check it from admin console I see
that it is not persisted.

I found this post which says that I have to assign primary keys by
hand but it still does not work.

[appengine-java] Re: owned one to many relationship problem

2010-04-27 Thread ylmz

unfortunately I still am having problem. if parent is already
persisted it does not work. I have a different post for that one.
http://groups.google.com/group/google-appengine-java/browse_thread/thread/a9955f8944a8c520

On Apr 19, 12:27 am, ylmz yilmazhuse...@gmail.com wrote:
 Hi every body. I have a problem with my model and I cannot figure out
 what the problem is. So any help would be appreciated. to explain the
 problem I wrote some sample code:
 Here is my model:

 Class A hasonetomanyrelationship with B
 Class B hasonetomanyrelationship with C

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 class A {
     @PrimaryKey
     @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
     public Key key;
     @Persistent(mappedBy = a)
     @Element(dependent = true)
     public ListB bList = new LinkedListB();

 }

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 class B {
     @PrimaryKey
     @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
     public Key key;
     @Persistent(mappedBy = b)
     @Element(dependent = true)
     public ListC cList = new LinkedListC();
     @Persistent
     public A a;

 }

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 class C {
     @PrimaryKey
     @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
     public Key key;
     @Persistent
     public B b;

 }

 in my code;
 1) I created class A B and C
 2) I persisted A
 3) I retrieved A from DB and add B to its list.
 4) I retrieved B from DB and add C to its list.

 but in step 4, I cannot retrieve B from DB, instead I get following
 exception
 javax.jdo.JDOObjectNotFoundException: Could not retrieve entity of
 kind B with key B(4).

 Code :

 PersistenceManager pm = PMF.get().getPersistenceManager();

 //1)Create A,B,C
 A a = new A();
 B b = new B();
 C c = new C();

 //2)Persist A
 pm.currentTransaction().begin();
 try {
    pm.makePersistent(a);
    pm.currentTransaction().commit();} finally {

    if(pm.currentTransaction().isActive())
       pm.currentTransaction().rollback();

 }

 //3)get A from DB and add B to its list
 pm.currentTransaction().begin();
 try {
   A newA = pm.getObjectById(A.class,a.key.getId());
   newA.bList.add(b);
   pm.currentTransaction().commit();} finally {

    if(pm.currentTransaction().isActive())
       pm.currentTransaction().rollback();

 }

 //4) get B from DB and add C to its list
 pm.currentTransaction().begin();
 try {
    /Error*/
    B newB = pm.getObjectById(B.class,b.key.getId());//we cannot
 retrieve this object. why?
    newB.cList.add(c);
    pm.currentTransaction().commit();} finally {

    if(pm.currentTransaction().isActive())
       pm.currentTransaction().rollback();

 }

 Please note that I am not sure that this is how I suppose to 
 implementownedonetomanyrelationship I got that implementation from
 following post

 http://groups.google.com/group/google-appengine-java/browse_thread/th...

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[appengine-java] Re: Single Sign on between applications

2010-04-27 Thread Patou

With a Google Apps Domain (login with user in the domain), it's
possible, but for all public application (with google account) the
user must sign in for all application.

On Apr 26, 11:42 pm, nearm...@gmail.com wrote:
 You may be able to accomplish this by using sub-domains. For example:
 my-sso-app.appspot.com
 blog.my-sso-app.appspot.com
 forum.my-sso-app.appspot.com
 I'm not 100% sure but I believe you can share data, and authentication 
 between apps in the same domain.

 Sent via BlackBerry from T-Mobile-Original Message-
 From: Ikai L (Google) ika...@google.com
 Date: Mon, 26 Apr 2010 11:33:10
 To: google-appengine-java@googlegroups.com
 Subject: Re: [appengine-java] Single Sign on between applications

 Not natively. You may want to look into doing something with OpenID, which
 may make the process a bit less bothersome, but won't remove the need to
 login completely.

 On Sat, Apr 24, 2010 at 11:51 AM, terran terran.le...@gmail.com wrote:

  Was trying to look around for an answer and couldn't find it, but if I
  owned several applications, could i create a single sign on page that
  would log into both applications at the same time? For example, if i
  had a blog type of web site and I wanted to integrate it with a forum
  application I had, could I sign into both with 1 screen?

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  unsubscr...@googlegroups.com
  .
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 --
 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: How to deal with large collections of objects?

2010-04-27 Thread ailinykh

define Cow as

class Cow {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;

@Persistent
@Extension(vendorName=datanucleus, key=gae.parent-pk,
value=true)
private Key farmKey;

}
If you set farmKey to farm id then both farm and cow will be in the
same entity group.

this code should work:

tx.begin()

Farm f = getFarm();
Cow c = new Cow();
c.setFarmKey(f.getId());
f.incCowCounter();
pm.makePersistent(c);  //if you need to know new cow id.

tx.commit();


Andrey



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[appengine-java] Re: Freemarker: Run local: OK. Run on cloud: Error

The fix provided in the blog above some how shoots (or hide???) the
inner problem. But the outer problem (cannot create
PageContextFactory) is still there. I get this exception after deploy
the *fixed* version to the cloud:

java.lang.NoClassDefFoundError: Could not initialize class
freemarker.ext.jsp.PageContextFactory
at
freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:
99)
at freemarker.core.Environment.visit(Environment.java:286)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:256)
at
freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:
452)
at
freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:
391)

I think Google didn't keep a good consistency here. The local GAE
should mimic the cloud in at least *stop* bugs like these.
I'm just commenting on FreeMarker guy blog. Hope that they can release
another fix soon.

On Apr 27, 6:20 pm, Sudhir Ramanandi sramana...@gmail.com wrote:
Aah, freemarker-gae-pre2.jar won't work either. I got the same error.
Asked to freemarker mailing list. Lets see what comes up.

Does any one else has any idea?

Thanks
SN

On Tue, Apr 27, 2010 at 11:29 AM, Sudhir Ramanandi
sramana...@gmail.comwrote:

See this
http://solveme.wordpress.com/2009/12/25/freemarker-sucks-it-has-depen...

You will have to download a GAE compatible version of freemarker. see above
link for download link.

Thanks
SN

On Tue, Apr 27, 2010 at 8:31 AM, Phuong Nguyen phuongn...@gmail.comwrote:

I can recall that I had it successfully run on the cloud few months
ago (when the latest version of sdk is still 1.3.1)

Funny thing is that, after several improvements and adaptation, I'm
now at 1.3.3.1 and my app work fine on local server. However, when I
upload it onto the cloud, here is what I got:

java.lang.VerifyError: (class: freemarker/ext/jsp/
FreeMarkerJspApplicationContext, method: init signature: ()V)
Incompatible argument to function
at

freemarker.ext.jsp.FreeMarkerJspFactory21.clinit(FreeMarkerJspFactory21.java:
12)
at

I'm dying. How on earth? I would probably get fired tomorrow.

[appengine-java] Re: How to deal with large collections of objects?

Thanks Andrey, that works perfectly. I wasn't understanding the
example in the docs about this:

  http://code.google.com/appengine/docs/java/datastore/transactions.html

section titled Creating Entities With Entity Groups.

Your example makes it clear,

Thanks

On Apr 27, 6:04 am, ailinykh ailin...@gmail.com wrote:
 define Cow as

 class Cow {
 @PrimaryKey
     @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
     private Key id;

         @Persistent
     @Extension(vendorName=datanucleus, key=gae.parent-pk,
 value=true)
     private Key farmKey;

 }

 If you set farmKey to farm id then both farm and cow will be in the
 same entity group.

 this code should work:

 tx.begin()

 Farm f = getFarm();
 Cow c = new Cow();
 c.setFarmKey(f.getId());
 f.incCowCounter();
 pm.makePersistent(c);  //if you need to know new cow id.

 tx.commit();

 Andrey

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Re: [appengine-java] Re: Freemarker: Run local: OK. Run on cloud: Error

Attila has created an issue here
http://code.google.com/p/googleappengine/issues/detail?id=3157
Vote for it.


Thanks
SN

On Tue, Apr 27, 2010 at 6:55 PM, Phuong Nguyen phuongn...@gmail.com wrote:

 The fix provided in the blog above some how shoots (or hide???) the
 inner problem. But the outer problem (cannot create
 PageContextFactory) is still there. I get this exception after deploy
 the *fixed* version to the cloud:

 java.lang.NoClassDefFoundError: Could not initialize class
 freemarker.ext.jsp.PageContextFactory
 at
 freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:
 99)
at freemarker.core.Environment.visit(Environment.java:286)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
 at freemarker.template.Template.process(Template.java:256)
 at
 freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:
 452)
at
 freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:
 391)


 I think Google didn't keep a good consistency here. The local GAE
 should mimic the cloud in at least *stop* bugs like these.
 I'm just commenting on FreeMarker guy blog. Hope that they can release
 another fix soon.

 On Apr 27, 6:20 pm, Sudhir Ramanandi sramana...@gmail.com wrote:
  Aah, freemarker-gae-pre2.jar won't work either. I got the same error.
  Asked to freemarker mailing list. Lets see what comes up.
 
  Does any one else has any idea?
 
  Thanks
  SN
 
  On Tue, Apr 27, 2010 at 11:29 AM, Sudhir Ramanandi sramana...@gmail.com
 wrote:
 
 
 
   First of all, Currently normal release of freemarker will not run on
 GAE as
   it has dependency on javax.swing package
   If you solve the problem you just mentioned, sooner or later you will
 get
   other problems
 
   See this
  http://solveme.wordpress.com/2009/12/25/freemarker-sucks-it-has-depen.
 ..
 
   You will have to download a GAE compatible version of freemarker. see
 above
   link for download link.
 
   Thanks
   SN
 
   On Tue, Apr 27, 2010 at 8:31 AM, Phuong Nguyen phuongn...@gmail.com
 wrote:
 
   Hi guys:
   I'm having spring-mvc + apache tiles + freemarker in my Gae
   Application.
   Everything works fine in my local machine after several nightmare of
   trying to figuring out the appropriate version of apache tiles to use.
 
   I can recall that I had it successfully run on the cloud few months
   ago (when the latest version of sdk is still 1.3.1)
 
   Funny thing is that, after several improvements and adaptation, I'm
   now at 1.3.3.1 and my app work fine on local server. However, when I
   upload it onto the cloud, here is what I got:
 
   java.lang.VerifyError: (class: freemarker/ext/jsp/
   FreeMarkerJspApplicationContext, method: init signature: ()V)
   Incompatible argument to function
  at
 
  
 com.google.appengine.runtime.Request.process-5cb3cd85ccb06a68(Request.java)
  at java.lang.Class.forName0(Native Method)
  at java.lang.Class.forName(Class.java:109)
  at freemarker.ext.jsp.FreeMarkerJspFactory21.class$
   (FreeMarkerJspFactory21.java:13)
  at
 
  
 freemarker.ext.jsp.FreeMarkerJspFactory21.clinit(FreeMarkerJspFactory21.java:
   12)
  at
 
  
 freemarker.ext.jsp.FreeMarkerPageContext21.clinit(FreeMarkerPageContext21.java:
   29)
  at java.lang.Class.forName0(Native Method)
  at java.lang.Class.forName(Class.java:109)
  at
  
 freemarker.ext.jsp.PageContextFactory.clinit(PageContextFactory.java:
   26)
  at
   freemarker.ext.jsp.TagTransformModel.getWriter(TagTransformModel.java:
   99)
  at freemarker.core.Environment.visit(Environment.java:286)
  at freemarker.core.UnifiedCall.accept(UnifiedCall.java:130)
  at freemarker.core.Environment.visit(Environment.java:210)
  at freemarker.core.MixedContent.accept(MixedContent.java:92)
  at freemarker.core.Environment.visit(Environment.java:210)
  at freemarker.core.Environment.process(Environment.java:190)
  at freemarker.template.Template.process(Template.java:237)
  at
  
 freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:
   452)
  at
   freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:
   391)
 
   I'm dying. How on earth? I would probably get fired tomorrow.
 
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[appengine-java] Manually restart GAE on the cloud

Is there any way to manually restart GAE on the cloud?

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Re: [appengine-java] Manually restart GAE on the cloud

2010-04-27 Thread Romain Pelisse

I actually saw a comic strip a while ago about how people will have to
change their behavior (ie stop rebooting when they fail to fix something),
but I never expected to actually see somebody ask about that.

You can't reboot the cloud. Simply redeploy a new version of your
application if you think your really screw something that bad (or explore
the administration panel)... At least, that would be my guess...

On 27 April 2010 16:26, Phuong Nguyen phuongn...@gmail.com wrote:

Is there any way to manually restart GAE on the cloud?

--
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The trouble with having an open mind, of course, is that people will insist
on coming along and trying to put things in it -- Terry Pratchett
http://belaran.eu/

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[appengine-java] App Engine Down?

2010-04-27 Thread luijar

We just experienced an outtage that seems to be from Google App Engine
for one of our registered app ID's. It lasted for several hours and it
seems to be back up again without us making any changes. Has anyone
else experienced this? If so, what was the cause?

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[appengine-java] Re: App Engine Down?

2010-04-27 Thread luijar

8:55AM Pacific was the last error we saw. Basically, it was throwing
DeadlineExceededExceptions quickly all of the time.

On Apr 27, 12:11 pm, luijar luis.j.aten...@gmail.com wrote:
 We just experienced an outtage that seems to be from Google App Engine
 for one of our registered app ID's. It lasted for several hours and it
 seems to be back up again without us making any changes. Has anyone
 else experienced this? If so, what was the cause?

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[appengine-java] Re: gql fetch performance

2010-04-27 Thread mandar khadilk

This is after deployment and not local. The locals fly fast. No issues
there.

As to your second point-
I set the prefetch to 50/100 etc and also chunk size. The limit for
the qry is also set to large value.

But as you suggested, I will do app stat.


On Apr 26, 4:17 pm, Ikai L (Google) ika...@google.com wrote:
 Are you doing this locally or after deployment? Check out this tool:

 http://code.google.com/appengine/docs/java/tools/appstats.html

 http://code.google.com/appengine/docs/java/tools/appstats.htmlYou'll be
 able to use this to identify bottlenecks. It's possible you're fetched each
 entity individually, for instance.





 On Mon, Apr 26, 2010 at 2:40 PM, mandar khadilk mkhad...@gmail.com wrote:
  BTW, the duration of the query fluctuates a lot. 2 sec to 15 secs.

  On Apr 26, 10:05 am, mandar khadilk mkhad...@gmail.com wrote:
   We have been testing gql based datastore performance for a while now.
   I am very disappointed so for what performance we are getting from our
   simple un-ordered fetch/get.

   Here is what we are doing-
   1. Make a kind based query with no filter and ordering. We fetch all
   the entity (not just keys) as we need attributes of the entities too.

   2. We use cursors with prefetch of 100 and chunk size 50.

   3. Each entity is around 100k

   We get around 7 sec to 15 secs to prepare the query and iterate over
   it (100 entities). In the fetch loop, we dont execute much code to
   consume CPU at all. We also use asQueryResultIterator.

   My question is, is this a normal performance? Are others getting way
   better than this?
   If yes, that is terrible. Is there a way to improve it further?

   Thanks in advance...

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[appengine-java] Re: JSP showing new DB data problem.

2010-04-27 Thread seleronm

Hi,

If the previous data is displayed,
I clear the browser cash when simply thinking.

They might be other causes.
I think that it is useful to check the content by log adminconsole.

thanks.



 When data is changed from the DB the JSP shows it to the user. The
 problem is that the JSP doesn't reload with the new data until I close
 session and start it again.

 My flow is like this:

 USer sign in (start session) - goes to XXX.jsp and fetchs data from
 the DB - data is changed from the DB - XXX.jsp does not show the new
 data until I stop session and start it again.

 How can I make the JSP show me the new data?

 Thanks!

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[appengine-java] AJAX on Google App Engine using JAVA

2010-04-27 Thread Thato Selebogo

Has anyone used AJAX to enable client RPC requests using JAVA. On the Google
App Engine website Paul Peavyhouse does exactly the same thing but he is
using Python. Does anyone know how to do the same thing but using JAVA?

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[appengine-java] Writing to a local file in development environment

2010-04-27 Thread Jaroslav Záruba

Due debugging purposes, and only in development environment, I need to
manipulate with a text-file. Obviously I ran into following message...
 access denied (java.io.FilePermission F:\workspace\AppEngine1\war\js\main.js 
 delete)

I thought adding the permission to java.policy would cure this, so I
modified all three I have on my system*, adding following line to the
'default' grant-block
 permission java.io.FilePermission F:\\workspace\\AppEngine1\\war\\js\\*, 
 read,write,delete;
(I hope the syntax is OK.)

But that did not help. :(

Which is the proper policy-file to modify? (Does the development
server honor them at all?)
Or could/should I pass my own by adding -
Djava.security.policy=mypolicy switch to run/debug settings in
Eclipse?

*) I believe the proper one is the one belonging to JRE that is
checked under Window - Preferences - Java - Installed JREs. I just
wanted to be sure...

Regards
  J. Záruba

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[appengine-java] Re: WARNING: This request caused a new process to be started for your application, and thus caused your application code to be loaded for the first time. This request may thus take

2010-04-27 Thread AndiMullaraj

Hi Ikai,

where can I get a more specific response to this issue? I find it odd
something like this would happen in first place (my app hangs for
about 7 seconds awaiting for the process to fire up). I tried pinging
my app every 2 minutes hoping the process would not go to sleep ... to
no effect.

Please advise -- this is very frustrating.

Andi



On Apr 21, 2:33 pm, Ikai L (Google) ika...@google.com wrote:
 Yep, we're rolling this out slowly with the 1.3.3 release to let developers
 know that some requests are slow because they are startup requests.

 On Wed, Apr 21, 2010 at 6:09 AM, Tristan tristan.slomin...@gmail.comwrote:





  Hey,

  I started seeing when a task queue starts now:

  WARNING: 200 OK
  This request caused a new process to be started for your application,
  and thus caused your application code to be loaded for the first time.
  This request may thus take longer and use more CPU than a typical
  request for your application.

  instead of this

  WARNING: 500
  Request was aborted after waiting too long to attempt to service your
  request. Most likely, this indicates that you have reached your
  simultaneous dynamic request limit. This is almost always due to
  excessively high latency in your app. Please see
 http://code.google.com/appengine/docs/quotas.htmlfor more details.

  I like it. Is this the expected behavior from now on?

  Tristan

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[appengine-java] Re: apparent appstats bug

2010-04-27 Thread Dick Johnson

As an addendum to my previous note-- when an app is deployed to App
Engine, I don't get the appstats 'hang' behaviour of my previous post,
in that the servlet response does finish rendering.  But, just as with
the local development version, the servlets that caused issues with
Appstats are not listed at all in the Appstats statistics page for the
deployed version.  For some reason, these servlets are not getting
properly processed by Appstats.

This seems especially problematic because the servlets in question,
that are not being reported by appstats, are in actuality taking up
the largest percentage of resources.

(One reason I'm so interested in Appstats is because I'm writing up
some info on it that will be published in future.  It does seem like
it's too buggy to wholeheartedly recommend at the current time...)



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[appengine-java] Re: Cold starts

2010-04-27 Thread Jake

Star this?  :)

http://code.google.com/p/googleappengine/issues/detail?id=2931

On Apr 27, 4:33 am, Richard richard.wat...@gmail.com wrote:
 My app has a *lot* of cold starts. Sometimes after 2 or 3 minutes,
 which seems very aggressive. I've let it go, tried to be good and
 waited for it to improve. Today I tried Pingdom and set it to a
 minute. Instant improvement.

 Googleistas, I really, really don't like doing that. I'll likely
 switch it off because I'm trying to be a good citizen, but the system
 is really driving bad behaviour - I imagine anyone who vaguely depends
 on GAE for money is pinging the heck out of their apps. Any chance
 we're going to get it sorted soon?

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Re: [appengine-java] Writing to a local file in development environment

2010-04-27 Thread Patrick Cornelißen

Hi!

2010/4/27 Jaroslav Záruba jaroslav.zar...@gmail.com

 Due debugging purposes, and only in development environment, I need to
 manipulate with a text-file. Obviously I ran into following message...
  access denied (java.io.FilePermission
 F:\workspace\AppEngine1\war\js\main.js delete)

 I thought adding the permission to java.policy would cure this, so I
 modified all three I have on my system*, adding following line to the
 'default' grant-block
  permission java.io.FilePermission
 F:\\workspace\\AppEngine1\\war\\js\\*, read,write,delete;
 (I hope the syntax is OK.)

 But that did not help. :(


You could also start a dedicated tomcat with a simple servlet that  just
receives a http get or post and writes the file for you. Your logging
would call this URL instead of writing into the file. As long as it's not
pure binary stuff, this should work. If it's binary, you could base64 it for
the transport.

Sorry for CC'ing you, but I think I am still blocked from posting to this
list because I have not been cleared by the list owner yet :-(

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[appengine-java] Re: Writing to a local file in development environment

2010-04-27 Thread Jaroslav Záruba

On Apr 27, 7:39 pm, Patrick Cornelißen corne...@pcornelissen.de
wrote:
 You could also start a dedicated tomcat

yes, the workaround here is easy... but so far i'm looking for a
solution, also i must!!!11 know why this is not working, i guess
you know that feeling :P

thank you anyways Patrick
best regards J. Záruba


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Re: [appengine-java] AJAX on Google App Engine using JAVA

2010-04-27 Thread Patrick Cornelißen

Hi!

2010/4/27 Thato Selebogo mahla...@gmail.com

 Has anyone used AJAX to enable client RPC requests using JAVA. On the
 Google App Engine website Paul Peavyhouse does exactly the same thing but he
 is using Python. Does anyone know how to do the same thing but using JAVA?


Maybe I am not understanding you right, but AJAX requests in a java app are
more or less just http calls with a decoding step afterwards, depending on
your requested content type.
Have you checked:
http://firestormws.sourceforge.net/
or other libraries that offer for example client side rest support for
java?

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Re: [appengine-java] Re: Writing to a local file in development environment

2010-04-27 Thread Patrick Cornelißen

Hi!

2010/4/27 Jaroslav Záruba jaroslav.zar...@gmail.com

 On Apr 27, 7:39 pm, Patrick Cornelißen corne...@pcornelissen.de
 wrote:
  You could also start a dedicated tomcat

 yes, the workaround here is easy... but so far i'm looking for a
 solution, also i must!!!11 know why this is not working, i guess
 you know that feeling :P


Hmm, but what would you write to the file that you wouldn't be able to just
dump out using the regular logging facility?


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Re: [appengine-java] Re: Can't decide: JDO, Twig-Persist or Objectify?

2010-04-27 Thread Jeff Schnitzer

The advantage of Objectify's key management is the generified Key?
class, which helps keep your code straight.

Jeff

On Mon, Apr 26, 2010 at 5:16 AM, Christian Goudreau
goudreau.christ...@gmail.com wrote:
 I didn't try, but I'm sure that if you set a Key field that doesn't exist in
 the datastore, it will be stored with the key you wanted. If I recall, store
 only auto assign a key when the key field is null or doesn't exist.
 @Key
 private long id;
 Christian

 On Mon, Apr 26, 2010 at 7:59 AM, David Sowerby david.sowe...@virgin.net
 wrote:

 Hi Christian

 That's interesting ...

 I just felt that I wanted to manage the references (keys) myself, so I
 could have more control over when and how those references are
 instantiated - Twig seems to do that for you (great in many ways), but
 I have some situations with my application where I think that could
 have a performance impact - I cannot be sure yet, but I wanted to play
 safe on that.

 The single developer question is tricky - I suppose it is more risky
 (he might want a holiday one day!), but on the other hand it is open
 source.

 On Apr 25, 1:29 pm, Christian Goudreau goudreau.christ...@gmail.com
 wrote:
  I have one question in mind after reading what you wrote, in wich way
  you
  have better control in Objectify than Twig ? I'm interested since I
  moved
  from Objectify to Twig and didn't end up in that situation, yet.
 
  For the cons of only one Developper, he may be alone, but he answer
  every
  single one question asked in his mailing list, though righ now he's in
  only
  for two weeks. And he works really fast, bug fix are often done in less
  than
  two days.
 
  Christian
 
  On Sun, Apr 25, 2010 at 5:11 AM, David Sowerby
  david.sowe...@virgin.netwrote:
 
 
 
   hi  jbdhl
 
   I wish there was an easy answer too - but I suppose at least we have
   choice!
 
   My experience, which I hope will at least help you a bit 
 
   For back ground  I am transferring a prototype developed using a
   db4o back end, but had little done for the UI.  There are a lot of
   relationships in the domain layer, and the design was very much OO not
   RDBMS
 
   I started by using JDO thinking it would give me portability.  I got
   it to work, but seemed to end up with some messy code.  To be fair,
   that in part was due to my lack of real understanding of GAE, but I
   didn't really feel I had achieved portability either - there would
   still have been changes to make to move elsewhere
 
   I therefore abandoned the idea of portability, accepting that I would
   probably have to re-write the Dao layer anyway, if ever I want to
   move.  I decided that it would be better to spend more time on getting
   that Dao layer isolated and independent - that would give me
   reasonable portability without compromising the different strengths of
   different persistent platforms.
 
   I tried Twig - it seemed a good solution, and was certainly easy to
   set up and use.  I found the documentation is bit sparse on property
   translators, but otherwise I had no real problems.  The amount which
   Twig takes away from you is one of those classic blessing/curse
   situations - it is a blessing not to have to think about some of the
   detail, but you lose control.  I felt that once I had understood GAE,
   I may be losing some of benefits by not having enough direct control -
   for this application.  I would certainly consider Twig again for other
   applications.
 
   So I have now migrated to Objectify, which seems fairly
   straightforward, and I have the level of control I was looking for -
   with a particular eye on performance since I do not yet have any idea
   how my application will perform
 
   I'm afraid the Twig-Objectify discussions occasionally get a bit like
   a religious argument, which is a shame because they have both done a
   great job, but with different approaches - and why not?  They serve
   different needs.
 
   You have probably read this already but I found this tremendously
   useful to understand GAE, which in turn helped me understand the
   choices I was trying to make (the Objectify reference isn't a plug -
   it is just a very well written article)
 
  http://code.google.com/p/objectify-appengine/wiki/Concepts
 
   Good luck - it would be interesting to know what you decide in the
   end ...
 
   On Apr 25, 5:42 am, bufferings bufferi...@gmail.com wrote:
Hi
 
I like Slim3.http://sites.google.com/site/slim3appengine/
 
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[appengine-java] Re: apparent appstats bug

2010-04-27 Thread Jens Scheffler

Hi,

If you look at the logs of your deployed application, do you see any
errors, such as an OutOfMemoryError? My current suspicion is that app
stats collects so much data (and keeps it in memory) for this request
that it runs out of memory before it can persist it. If that is the
case, we might be seeing something like that in the error logs.

Best regards,

   Jens


On Apr 27, 10:01 am, Dick Johnson d...@infosleuth.net wrote:
 As an addendum to my previous note-- when an app is deployed to App
 Engine, I don't get the appstats 'hang' behaviour of my previous post,
 in that the servlet response does finish rendering.  But, just as with
 the local development version, the servlets that caused issues with
 Appstats are not listed at all in the Appstats statistics page for the
 deployed version.  For some reason, these servlets are not getting
 properly processed by Appstats.

 This seems especially problematic because the servlets in question,
 that are not being reported by appstats, are in actuality taking up
 the largest percentage of resources.

 (One reason I'm so interested in Appstats is because I'm writing up
 some info on it that will be published in future.  It does seem like
 it's too buggy to wholeheartedly recommend at the current time...)

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[appengine-java] Re: WARNING: This request caused a new process to be started for your application, and thus caused your application code to be loaded for the first time. This request may thus take

2010-04-27 Thread Tristan

Hey Andi,

It goes something like this as far as I understand it.

Your app lives in a process. When requests come in, those requests are
handed to the app process to do what it needs to do and send a
response. When request A comes in and there are no active processes,
the app process starts up (the 7 seconds you see) in order to handle
request A. Let's say that while it is handling request A, request B,
C, D, and E come in. Because the process is busy handling A, the new
requests (B, C, D, and E) are put on a queue. There is some magic
calculation that goes on here that involves a few things. If the
calculation sees that your process can handle a request very fast, it
piles more requests on the queue, so that the queue could be B:C:D:E
because it has faith that response will happen in reasonable time. On
the other hand, if the calculation sees that your process is taking
it's sweet time, it decides to start another process (another 7
seconds you see), and then gives the next request in the queue (B) to
that process to ensure that the very last request on the queue - E
gets served in reasonable time.

After some time period when a process has no requests waiting in the
queue, it kills itself. From what I read, it takes on average 1
request per second to keep process from giving up on the world of the
living.

If you look at the appengine roadmap, reserved instances are there.
So pretty soon we'll be able to pay for having a process staying alive
to server requests.

I may be wrong.

Cheers,

Tristan


On Apr 26, 10:44 pm, AndiMullaraj andimulla...@gmail.com wrote:
 Hi Ikai,

 where can I get a more specific response to this issue? I find it odd
 something like this would happen in first place (my app hangs for
 about 7 seconds awaiting for the process to fire up). I tried pinging
 my app every 2 minutes hoping the process would not go to sleep ... to
 no effect.

 Please advise -- this is very frustrating.

 Andi

 On Apr 21, 2:33 pm, Ikai L (Google) ika...@google.com wrote:





  Yep, we're rolling this out slowly with the 1.3.3 release to let developers
  know that some requests are slow because they are startup requests.

  On Wed, Apr 21, 2010 at 6:09 AM, Tristan tristan.slomin...@gmail.comwrote:

   Hey,

   I started seeing when a task queue starts now:

   WARNING: 200 OK
   This request caused a new process to be started for your application,
   and thus caused your application code to be loaded for the first time.
   This request may thus take longer and use more CPU than a typical
   request for your application.

   instead of this

   WARNING: 500
   Request was aborted after waiting too long to attempt to service your
   request. Most likely, this indicates that you have reached your
   simultaneous dynamic request limit. This is almost always due to
   excessively high latency in your app. Please see
  http://code.google.com/appengine/docs/quotas.htmlformore details.

   I like it. Is this the expected behavior from now on?

   Tristan

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[appengine-java] Re: Efficient One to Many Relationship

2010-04-27 Thread Tristan

1) yes, that should work just fine (at least in low-level datastore
API it does)
2) your key should not be your security / accessibility mechanism, so
yes, it should be fine (although using a Long id vs. keyAsString would
be prettier). also, you want to make sure you restrict access to your
entities by who can see the entity
3) since we're using approach in #1, just add that to your query,
where listItem parentKey = listcontainerkey and isProcess=true or
whatnot. much easier.

On Apr 26, 9:47 pm, Pk prakash...@gmail.com wrote:
 Hi, I have a parent ListContainer entity with key and name properties.
 and I have a child ListItem entity with key, name and parentkey
 properties. The parentkey simply refers to the key in ListContainer. I
 am building a site where I list the names in listcontainer, and when
 the user chooses a name, it'll display the top 100 list items. I have
 three questions
 1) I am wondering if it would be efficient in terms of performance if
 I use the key on child approach. i.e., query the listitem where
 parentkey = listcontainerkey.
 2) While displaying the names of listcontainer, is it safe to pass the
 keys to the client browser and get it back?
 3) The ListItem has an additional property IsProcessed. Now, I want
 to display only the items which are not processed. Over a period if
 time, I am expecting lot of listitems per listcontainer. Do you think
 it would be wise to have the processed items in separate list and
 delete it from the original?

 I would very much appreciate your help as I've been struggling with
 this requirement for long time.

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[appengine-java] Re: Can't decide: JDO, Twig-Persist or Objectify?

2010-04-27 Thread jbdhl

For your information I ended up choosing Objectify. I picked that
because...

  * of its very informative, yet short and elegant, documentation. In
fact, it is a far more precise and explanatory description of
datastore than in Google's own GAE documentation;

  * the simple, yet powerful API. I like the fact that its very
transparent and faithful to datastore. Twig-Persist aims to simplify
some tasks but at the cost of transparency IMO. The below thread gives
an example of this with one-to-many references:
   
http://groups.google.com/group/google-appengine-java/browse_thread/thread/f20d922ffecb310c
I like when I can control what's going on in performance critical
layers like the persistence layer.

  * there are multiple active developers. Often seen pro-open-source
comments like »the one developer problem is mitigated by the fact
that you can fix your own bugs/add your own features« is frivolous: I
intent to use my resources for developing applications - not for
maintaining API's.

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[appengine-java] Re: Updating data class resets data fields

2010-04-27 Thread kghate

any ideas on what I am doing wrong? Please help!

On Apr 27, 12:31 am, kghate kgh...@gmail.com wrote:
 I am storing some persistent data and all is working fine, I have a
 simple data class per examples provided in the Storing Data section.

 However, I noticed that all my stored data got reset to null when I
 added a couple new fields to be stored.

 To give an example, my employee data class was storing firstName and
 DOB and had 5 entries. I added two more fields, lastName and
 isPermanent and found that my earlier 5 entries got reset to null. The
 new data class is working fine and all new entries are being stored as
 expected, but I lost existing entries.

 What am I doing wrong here? Is this expected behavior? How do I ensure
 that existing data does not get reset when new persistent fields are
 added to the data class?

 Please help!

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[appengine-java] Re: Uploading blobs and authentication

2010-04-27 Thread keyurva

Submitted a new feature request for this:

http://code.google.com/p/googleappengine/issues/detail?id=3160

== Keyur

On Apr 26, 1:57 pm, keyurva keyu...@gmail.com wrote:
 Currently to upload blobs, the blob store service creates a unique one-
 time URL that a user can post blobs to. My requirement is that I only
 want authenticated / authorized users to post blobs in my application.
 I can achieve this currently if the page that includes the multipart
 form to upload blobs is in my application.

 However, I am looking to providing a REST API for my users to upload
 their blobs. While it is true that the one-time nature of the upload
 URL mitigates the chances of rogue use but it's still possible.

 I was wondering if the app engine team can consider a feature where
 developers can register an upload listener. A standard servlet filter
 could also potentially do the job. This will give us an opportunity to
 authenticate / validate / decorate requests before the request gets
 forwarded to the blob store service.

 Thanks,
 Keyur

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Re: [appengine-java] Re: Updating data class resets data fields

2010-04-27 Thread Ikai L (Google)

No, this is not expected behavior. Try rolling back your application and
seeing if this still occurs. I suspect something else is wrong - you just
need to narrow down the version of your application that causes this to
happen.

2010/4/27 Marcos Vinícius Soares mavsoa...@gmail.com

 I believe this is not allowed. Once you change a class you cannot retrieve
 the older objects anymore. In this case, you added a field to a class, but,
 what if you had removed two fields!? How is the framework supposed to treat
 this!?

 Try rolling back your class and see if you can retrieve the old objects. I
 believe you will only be able to get them this way.




 On Tue, Apr 27, 2010 at 4:22 PM, kghate kgh...@gmail.com wrote:

 any ideas on what I am doing wrong? Please help!

 On Apr 27, 12:31 am, kghate kgh...@gmail.com wrote:
  I am storing some persistent data and all is working fine, I have a
  simple data class per examples provided in the Storing Data section.
 
  However, I noticed that all my stored data got reset to null when I
  added a couple new fields to be stored.
 
  To give an example, my employee data class was storing firstName and
  DOB and had 5 entries. I added two more fields, lastName and
  isPermanent and found that my earlier 5 entries got reset to null. The
  new data class is working fine and all new entries are being stored as
  expected, but I lost existing entries.
 
  What am I doing wrong here? Is this expected behavior? How do I ensure
  that existing data does not get reset when new persistent fields are
  added to the data class?
 
  Please help!
 
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[appengine-java] Questions about BlobstoreService fetchData and serve

2010-04-27 Thread Rahul Ravikumar

The BlobstoreService has two method using which one can fetch data.

The first one being fetchData(blobKey, start, end) = which fetches
the subset for a blob.
The second being serve(blobKey)

Is there a reason why the serve method, does not maintain the same
contract as that of fetchData(...) ? What if i wanted to serve a part
of the blob ? Should i be using the fetchData(...) instead?

My second question is, that if i was fetching partial blobs, what
would be more optimal ?
a. large number of smaller fetchData requests or one large fetchData
request ?

Thanks,
Rahul

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[appengine-java] about count query

Hi all
i am using JDO and i want to count the number of entities so which is
more efficient
using a count quert, eg:
 select count (this) from User
or  key only query
 select id from User
 then get the count using resultList.size();

by the way , i know that the recommended way on appengine is to
precompute but this cannot be done in my case
thanks
Joe


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[appengine-java] persisting primitive list using JPA

Hi all
GAE JPA implementation level is version 1 which does not support list
of primitives
and i want to port my JDO code to JPA
so how can i convert
@Persistent private ListString tags;
to its JPA counterpart which work on appengine as a list property not
a blob(not using serialization)
and if possible to use a valid JPA annotation in that context as using
@Basic on a list is not allowed by the specs and my ide (Intellij)
complains
thanks
Joe

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[appengine-java] maximum size of a datastore API call response

Hi all
in the doc , section Quotas and Limits
i found maximum size of a datastore API call response= 1 MB
what does this mean?
does it mean that the query result cannot exceed 1 MB , so what about
the rest of the result, does the JDO layer take care of this and
handle it transparently or what?
do i have to calculate anything for my queries or repeat them or page
them to cope with this limitation?
How exactly this limitation affects my code?
another question
as of release 1.3.2 the 1000 limitation of query result were gone...
so if i want to get the entities from 1500 to 1520
is using the traditional way (in JDO, using the
query.range(begin,limit)) uses cursors or do i have to use the cursor
api as described in the docs
is the default way (without cursors) still get all the results and
drop the first 1500
thanks in advance
Joe

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[appengine-java] Re: Inheritance hierarchy and getExtent

2010-04-27 Thread Maxim Cherednik

Hey Simith,
I am struggling exactly with the same problem.

I read manual about inheritance here
http://code.google.com/appengine/docs/java/datastore/dataclasses.html#Inheritance
So I was pretty sure that JDO inheritance on App Engine works as
described in the DataNucleus documentation.

First of all, Saving works for me, but I have no idea how to retrieve
ListBaseClass :(

Any ideas?

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[appengine-java] Specifying a date filter in a query

2010-04-27 Thread Vinay

Hi,
I am new to Java and App engine. I am trying to query data that has
been written to the datastore using JDO. I am getting an exception
when I try to filter on a Date property:

Query query = pm.newQuery(DataPoint.class);
query.setFilter( m_tradeDateTime  DATETIME(2010, 10,1,
0, 0,0));

ListDataPoint dp = (ListDataPoint)query.execute();

m_tradeDateTime  is of type Date. DATE or DATETIME fails when the
query is parsed. What is the right way of specifying a date value in a
filter? Filtering on a string property works correctly, not sure what
is the expected format for specifying a value for a Date type
property.

Thanks,
-Vinay

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[appengine-java] Which is more efficient? single query or a key only query followed by batch get

Hi all
the title says it all...
which one is more efficient in:
   cpu usage
   time consumption
thanks
Joe

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[appengine-java] Re: Does AppEngine really include JPA Support

Hi dear
it seams that u r new to appengine
please take enough time to understand the datastore concepts as it is
not a RDBMS
and yes appengine JPA code is not 100% portable, you have to do some
work (both on the domain layer and the dao layer) to port RDBMS jpa
code to appengine and the reverse
Joe

On Apr 13, 9:38 am, Al Sutton a...@funkyandroid.com wrote:
 Fromhttp://code.google.com/appengine/docs/java/datastore/usingjpa.html;

 The App Engine Java SDK includes an implementation of JPA 1.0 for the
 App Engine datastore.

 But from a couple of days work I've already found the following things
 which don't comply with the JPA spec;

 - Strings can't be used for @Id values (unless you use a GAE specific
 extension).
 - Longs can't be used for @Id values for items in a List.
 - Maps seem totally broken. Trying the example from 9.1.27 of the JPA
 spec (ejb-3_0-fr-spec-persistence.pdf) generates a method about FK
 maps being not supported.

 Did I miss something, or does AppEngine actually not contain an
 implementation of JPA, but contains a semi-functional work in progress
 which only provides some features of JPA?

 Al.

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[appengine-java] App Engine downtime TOMORROW, Wed Apr 28 1-2p PDT

2010-04-27 Thread Wesley C (Google)

App Engine downtime TOMORROW, Wed Apr 28 1-2p PDT (GMT-7) and same
time next Wed, May 5

http://groups.google.com/group/google-appengine-downtime-notify/browse_thread/thread/4857b46e4e6ff0f9

please join the downtime notification group to be alerted on all such
planned downtimes. all apps will go into read-only mode for tomorrow's
downtime as well as next week's.

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[appengine-java] Re: Efficient One to Many Relationship

2010-04-27 Thread Pk

Thank you so much Tristan. I have another question on top of #3.
I can query on listitem parentkey = listcontainerkey and isproccess =
true. it is easier, yes. but I expect the data to be growing. there;ll
be lot of users with all their listitems stored in a single big list,
the processed and unprocessed items. Most of the times, I'll query on
the parentkey = listcontainerkey and isprocessed = true. Do you think
it's still efficient in terms of performance?


On Apr 28, 12:51 am, Tristan tristan.slomin...@gmail.com wrote:
 1) yes, that should work just fine (at least in low-level datastore
 API it does)
 2) your key should not be your security / accessibility mechanism, so
 yes, it should be fine (although using a Long id vs. keyAsString would
 be prettier). also, you want to make sure you restrict access to your
 entities by who can see the entity
 3) since we're using approach in #1, just add that to your query,
 where listItem parentKey = listcontainerkey and isProcess=true or
 whatnot. much easier.

 On Apr 26, 9:47 pm, Pk prakash...@gmail.com wrote:



  Hi, I have a parent ListContainer entity with key and name properties.
  and I have a child ListItem entity with key, name and parentkey
  properties. The parentkey simply refers to the key in ListContainer. I
  am building a site where I list the names in listcontainer, and when
  the user chooses a name, it'll display the top 100 list items. I have
  three questions
  1) I am wondering if it would be efficient in terms of performance if
  I use the key on child approach. i.e., query the listitem where
  parentkey = listcontainerkey.
  2) While displaying the names of listcontainer, is it safe to pass the
  keys to the client browser and get it back?
  3) The ListItem has an additional property IsProcessed. Now, I want
  to display only the items which are not processed. Over a period if
  time, I am expecting lot of listitems per listcontainer. Do you think
  it would be wise to have the processed items in separate list and
  delete it from the original?

  I would very much appreciate your help as I've been struggling with
  this requirement for long time.

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[appengine-java] Re: Efficient One to Many Relationship

2010-04-27 Thread Pk

Btw, I am not going to get all the isprocessed=true records at once.
I'll get only the top 100 at any given time.

On Apr 28, 7:05 am, Pk prakash...@gmail.com wrote:
 Thank you so much Tristan. I have another question on top of #3.
 I can query on listitem parentkey = listcontainerkey and isproccess =
 true. it is easier, yes. but I expect the data to be growing. there;ll
 be lot of users with all their listitems stored in a single big list,
 the processed and unprocessed items. Most of the times, I'll query on
 the parentkey = listcontainerkey and isprocessed = true. Do you think
 it's still efficient in terms of performance?

 On Apr 28, 12:51 am, Tristan tristan.slomin...@gmail.com wrote:



  1) yes, that should work just fine (at least in low-level datastore
  API it does)
  2) your key should not be your security / accessibility mechanism, so
  yes, it should be fine (although using a Long id vs. keyAsString would
  be prettier). also, you want to make sure you restrict access to your
  entities by who can see the entity
  3) since we're using approach in #1, just add that to your query,
  where listItem parentKey = listcontainerkey and isProcess=true or
  whatnot. much easier.

  On Apr 26, 9:47 pm, Pk prakash...@gmail.com wrote:

   Hi, I have a parent ListContainer entity with key and name properties.
   and I have a child ListItem entity with key, name and parentkey
   properties. The parentkey simply refers to the key in ListContainer. I
   am building a site where I list the names in listcontainer, and when
   the user chooses a name, it'll display the top 100 list items. I have
   three questions
   1) I am wondering if it would be efficient in terms of performance if
   I use the key on child approach. i.e., query the listitem where
   parentkey = listcontainerkey.
   2) While displaying the names of listcontainer, is it safe to pass the
   keys to the client browser and get it back?
   3) The ListItem has an additional property IsProcessed. Now, I want
   to display only the items which are not processed. Over a period if
   time, I am expecting lot of listitems per listcontainer. Do you think
   it would be wise to have the processed items in separate list and
   delete it from the original?

   I would very much appreciate your help as I've been struggling with
   this requirement for long time.

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Re: [appengine-java] Specifying a date filter in a query

2010-04-27 Thread Chau Huynh

http://www.datanucleus.org/products/accessplatform_2_0/jdo/jdoql.htmlExample
3 is the right answer for you.
It might be better if you could go through document to have an understanding
on its concepts first.
Thanks.

On Wed, Apr 28, 2010 at 1:36 AM, Vinay vinaytand...@gmail.com wrote:

Hi,
I am new to Java and App engine. I am trying to query data that has
been written to the datastore using JDO. I am getting an exception
when I try to filter on a Date property:

Query query = pm.newQuery(DataPoint.class);
query.setFilter( m_tradeDateTime DATETIME(2010, 10,1,
0, 0,0));

ListDataPoint dp = (ListDataPoint)query.execute();

m_tradeDateTime is of type Date. DATE or DATETIME fails when the
query is parsed. What is the right way of specifying a date value in a
filter? Filtering on a string property works correctly, not sure what
is the expected format for specifying a value for a Date type
property.

Thanks,
-Vinay

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Re: [appengine-java] Which is more efficient? single query or a key only query followed by batch get

2010-04-27 Thread 风笑雪

In my previous test, query is faster.

--
keakon



2010/4/28 Joe Fawzy joewic...@gmail.com:
 Hi all
 the title says it all...
 which one is more efficient in:
   cpu usage
   time consumption
 thanks
 Joe

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[appengine-java] Re: Manually restart GAE on the cloud

:))

Sorry if I used the wrong word. I mean restart my JVM. Since each app
will be allocated some JVMs, which run on some servers, I wonder if I
can reboot them. It is not an ideal solution, certainly, when you are
talking about error-tolerance and scaling. However, during some phase
of development, the behavior of your app become unpredictable on
someway and we need a way to reset the app to get to certain stable
state or try to figure out the problem.

Deploy a new version can restart my JVM? May be not. Recently, I get
an VerifyError error while my FreeMarker engine try to instantiate a
class named FreeMarkerJspApplicationContext. In subsequence request,
FreeMarker always throw java.lang.NoClassDefFoundError (without any
reference to VerifyError), so I guess GAE JVM some how cached the
class definition. I modified the version number and redeploy and guess
what, the behavior of FreeMarker engine is just like the JVM is never
restarted. I tried after 10 hours and now it is showing VerifyError.

You just never know, 'till you jump into the mess. I believe such
feature is nice to have, though.

On Apr 27, 10:50 pm, Romain Pelisse bela...@gmail.com wrote:
:D

On 27 April 2010 16:26, Phuong Nguyen phuongn...@gmail.com wrote:

Is there any way to manually restart GAE on the cloud?

--
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The trouble with having an open mind, of course, is that people will insist
on coming along and trying to put things in it -- Terry
Pratchetthttp://belaran.eu/

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Re: [appengine-java] about count query

2010-04-27 Thread Chau Huynh

On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy joewic...@gmail.com wrote:
select count (this) from User
Since when app engine support group operation? ;-)

On Wed, Apr 28, 2010 at 5:24 AM, Joe Fawzy joewic...@gmail.com wrote:

 Hi all
 i am using JDO and i want to count the number of entities so which is
 more efficient
 using a count quert, eg:
  select count (this) from User
 or  key only query
  select id from User
  then get the count using resultList.size();

 by the way , i know that the recommended way on appengine is to
 precompute but this cannot be done in my case
 thanks
 Joe


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[appengine-java] Re: Manually restart GAE on the cloud

2010-04-27 Thread Thomas

In the Admin Console you can disable your application and re-enable
it. I think it is much like a JVM reboot.

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[appengine-java] Re: Manually restart GAE on the cloud

I think disable/enable your app doesnot reboot JVM.

I'm trying FreeMarker. If JVM process a class for the first time, then
VerifyError is thrown. On second time, it throw NoClassDefFoundError.
When I disabled and reenabled, JVM still throws NoClassDefFoundError.
So I guess JVM is not restarted.

On Apr 28, 10:00 am, Thomas mylee...@gmail.com wrote:
 In the Admin Console you can disable your application and re-enable
 it. I think it is much like a JVM reboot.

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Re: [appengine-java] Re: Manually restart GAE on the cloud

2010-04-27 Thread Chau Huynh

Delete the version and redeploy, maybe?
Or should Google hep you look into your case, as App Engine user do not have
such direct control on their system to reboot.

On Wed, Apr 28, 2010 at 10:54 AM, Phuong Nguyen phuongn...@gmail.comwrote:

I think disable/enable your app doesnot reboot JVM.

I'm trying FreeMarker. If JVM process a class for the first time, then
VerifyError is thrown. On second time, it throw NoClassDefFoundError.
When I disabled and reenabled, JVM still throws NoClassDefFoundError.
So I guess JVM is not restarted.

On Apr 28, 10:00 am, Thomas mylee...@gmail.com wrote:
In the Admin Console you can disable your application and re-enable
it. I think it is much like a JVM reboot.

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[appengine-java] cc sender

2010-04-27 Thread Philip Tucker

Is it possible to send an email via Transport.send without it sending
a CC: to the FROM: address?

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

Can anyone from google explain what
java.lang.VerifyError: (class:
freemarker/ext/jsp/FreeMarkerJspApplicationContext, method: init
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

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FreeMarkerJspApplicationContext.java
Description: Binary data

[google-appengine] db.Expando not working with new SDK 1.3.3

With new SDK i'm getting this error when working with db.Expando
models. It gives this error on simple get. My application stop working
after this update. Any ideas?  I still can see data in Data Viewer.
I'm getting this error on production.

  File /base/python_runtime/python_lib/versions/1/google/appengine/
ext/db/__init__.py, line 1028, in get_by_key_name
return get(keys[0], rpc=rpc)
  File /base/python_runtime/python_lib/versions/1/google/appengine/
ext/db/__init__.py, line 1255, in get
model = cls1.from_entity(entity)
  File /base/python_runtime/python_lib/versions/1/google/appengine/
ext/db/__init__.py, line 1179, in from_entity
instance = cls(None, _from_entity=True, **entity_values)
  File /base/python_runtime/python_lib/versions/1/google/appengine/
ext/db/__init__.py, line 1403, in __init__
setattr(self, prop, value)
  File /base/python_runtime/python_lib/versions/1/google/appengine/
ext/db/__init__.py, line 1435, in __setattr__
super(Expando, self).__setattr__(key, value)
AttributeError: can't set attribute

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[google-appengine] Re: Invalid IP or statistic. Blacklist bug?

It seems to be internal ip-addresses for task queues

On 27 апр, 11:45, buger leons...@gmail.com wrote:
 i also see this IP 0.1.0.1

 On Apr 27, 11:41 am, buger leons...@gmail.com wrote:

  What is this IP 0.1.0.2?http://goo.gl/uxnz
  For my services it's like DoS attack )

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[google-appengine] Re: data structure to implement some of your friends also like this feature.

2010-04-27 Thread Krishna

I'm interested in hearing thoughts on this as well.

Herbert: I had a similar problem sometime ago and I solved it by using
a single ListProperty with custom prefixes to distinguish between
fields of different types. So in your example, I would have used a
prefix f.. to represent a friend and  l.. to represent a like. So
you would filter Users by friendlikes (one list property instead of
two separate ones) == f..me  l..A.



On Apr 26, 7:20 pm, Herbert herber...@gmail.com wrote:
 Sorry, suddenly got a thought on it.

 Can I do two equality check on both User.friends and User.likes ?
 would that be cause an exploding index?

 I.E. User.all().filter(friends =, me).filter(likes =, A).fetch(3)

 thanks!
 Herbert

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[google-appengine] Re: problem with memcache

2010-04-27 Thread RockyWolf

Replace net.sf.jsr107 in the import statements by javax.cache




On Apr 19, 9:46 am, RockyWolf jamesisaa...@gmail.com wrote:
 I get this error when I try to run my app:
  com.scrapbook.CacheException: Class: 'ri.cache.BasicCacheFactory'
 does not implement CacheFactory 
 I had included all the necessary jar files in the src folder as the
 compiler doesnt recognise them if put in net.sf.jsr107. I don't
 understand why it says  the import net cannot be resolved .

 Has anyone faced this problem?

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[google-appengine] Re: db.Expando not working with new SDK 1.3.3

That was my mistake but previous versions of SDK it ignored)
On 27 апр, 12:14, buger leons...@gmail.com wrote:
 With new SDK i'm getting this error when working with db.Expando
 models. It gives this error on simple get. My application stop working
 after this update. Any ideas?  I still can see data in Data Viewer.
 I'm getting this error on production.

   File /base/python_runtime/python_lib/versions/1/google/appengine/
 ext/db/__init__.py, line 1028, in get_by_key_name
     return get(keys[0], rpc=rpc)
   File /base/python_runtime/python_lib/versions/1/google/appengine/
 ext/db/__init__.py, line 1255, in get
     model = cls1.from_entity(entity)
   File /base/python_runtime/python_lib/versions/1/google/appengine/
 ext/db/__init__.py, line 1179, in from_entity
     instance = cls(None, _from_entity=True, **entity_values)
   File /base/python_runtime/python_lib/versions/1/google/appengine/
 ext/db/__init__.py, line 1403, in __init__
     setattr(self, prop, value)
   File /base/python_runtime/python_lib/versions/1/google/appengine/
 ext/db/__init__.py, line 1435, in __setattr__
     super(Expando, self).__setattr__(key, value)
 AttributeError: can't set attribute

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[google-appengine] Re: db.Expando not working with new SDK 1.3.3

BTW, it was becouse i had @propery as function, defined in class, with
same name of db.Expando property. I just renamed my function.

On Apr 27, 2:32 pm, buger leons...@gmail.com wrote:
 That was my mistake but previous versions of SDK it ignored)
 On 27 апр, 12:14, buger leons...@gmail.com wrote:





  With new SDK i'm getting this error when working with db.Expando
  models. It gives this error on simple get. My application stop working
  after this update. Any ideas?  I still can see data in Data Viewer.
  I'm getting this error on production.

    File /base/python_runtime/python_lib/versions/1/google/appengine/
  ext/db/__init__.py, line 1028, in get_by_key_name
      return get(keys[0], rpc=rpc)
    File /base/python_runtime/python_lib/versions/1/google/appengine/
  ext/db/__init__.py, line 1255, in get
      model = cls1.from_entity(entity)
    File /base/python_runtime/python_lib/versions/1/google/appengine/
  ext/db/__init__.py, line 1179, in from_entity
      instance = cls(None, _from_entity=True, **entity_values)
    File /base/python_runtime/python_lib/versions/1/google/appengine/
  ext/db/__init__.py, line 1403, in __init__
      setattr(self, prop, value)
    File /base/python_runtime/python_lib/versions/1/google/appengine/
  ext/db/__init__.py, line 1435, in __setattr__
      super(Expando, self).__setattr__(key, value)
  AttributeError: can't set attribute

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[google-appengine] Re: data structure to implement some of your friends also like this feature.

2010-04-27 Thread Herbert

Krishna: i see what you mean. so instead of querying for two lists you
do a prefixed self-join. i quickly test my version that queries two
lists that actually works fine, but i don't have a big test case yet.
coz anything bigger than thousand rows slows down in the dev server
even for simple query anyway, and i haven't had time to try that on
the production server yet. i reall don't need sorting, so i'm happy as
long as i could get some of the results safely and quickly

after reading your approach i was thinking, that it shoudlnt make a
difference querying the same list twice or two lists once. recalling
the zig-zag search in the building scalable apps talk, since both
versions mentioned above have two equality filters, it seems the query
will perform the same 'zig-zag' search, just on different values.

thanks much!

On Apr 27, 5:16 pm, Krishna shrikrishna.sh...@gmail.com wrote:
 I'm interested in hearing thoughts on this as well.

 Herbert: I had a similar problem sometime ago and I solved it by using
 a single ListProperty with custom prefixes to distinguish between
 fields of different types. So in your example, I would have used a
 prefix f.. to represent a friend and  l.. to represent a like. So
 you would filter Users by friendlikes (one list property instead of
 two separate ones) == f..me  l..A.

 On Apr 26, 7:20 pm, Herbert herber...@gmail.com wrote:

  Sorry, suddenly got a thought on it.

  Can I do two equality check on both User.friends and User.likes ?
  would that be cause an exploding index?

  I.E. User.all().filter(friends =, me).filter(likes =, A).fetch(3)

  thanks!
  Herbert

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Re: [google-appengine] Re: data structure to implement some of your friends also like this feature.

2010-04-27 Thread Nick Johnson (Google)

Hi Herbert,

A query like this will use the merge join strategy by default. If it's too
slow for the merge join strategy, you could have to build a custom index for
it, which would indeed be 'exploding' - each User entity would have
len(friends)*len(likes) index entries.

-Nick

On Mon, Apr 26, 2010 at 3:20 PM, Herbert herber...@gmail.com wrote:

Sorry, suddenly got a thought on it.

Can I do two equality check on both User.friends and User.likes ?
would that be cause an exploding index?

I.E. User.all().filter(friends =, me).filter(likes =, A).fetch(3)

thanks!
Herbert

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[google-appengine] Got CAS client working with appengine (java)

2010-04-27 Thread Piwaï

Hi !

Just wanted to let you know, I was able to use CAS client (http://
www.jasig.org/cas) with AppEngine. So I'll write the few steps here,
in case anyone look for it when searching on Google ;-)

First, I followed these steps :

http://www.ja-sig.org/wiki/display/CASC/Configuring+the+JA-SIG+CAS+Client+for+Java+in+the+web.xml

I downloaded cas-client-3.1.10 here :
http://www.ja-sig.org/downloads/cas-clients/cas-client-3.1.10-release.zip

I only used cas-client-core. However, I had to make some changes to
one of the classes :
org.jasig.cas.client.util.AbstractConfigurationFilter . This is
because the filter tries to instanciate an InitialContext() to find
parameters in the context. Appengine does not seem yet to allow
instanciation of InitialContext.

So I changed the following file :

cas-client-3.1.10-release\cas-client-3.1.10\cas-client-core\src\main
\java\org\jasig\cas\client\util\AbstractConfigurationFilter.java

and removed some code in the middle :

***
protected final String getPropertyFromInitParams(final
FilterConfig filterConfig, final String propertyName, final String
defaultValue)  {
final String value =
filterConfig.getInitParameter(propertyName);

if (CommonUtils.isNotBlank(value)) {
log.info(Property [ + propertyName + ] loaded from
FilterConfig.getInitParameter with value [ + value + ]);
return value;
}

final String value2 =
filterConfig.getServletContext().getInitParameter(propertyName);

if (CommonUtils.isNotBlank(value2)) {
log.info(Property [ + propertyName + ] loaded from
ServletContext.getInitParameter with value [ + value2 + ]);
return value2;
}
// ** CODE REMOVED HERE

log.info(Property [ + propertyName + ] not found.  Using
default value [ + defaultValue + ]);
return defaultValue;
}
***

I then repackaged cas-client :
cd cas-client-3.1.10/cas-client-core
mvn package -Dmaven.test.skip

I added cas-client-3.1.10/cas-client-core-patched/target/cas-client-
core-3.1.10.jar to my GAE project.

Then it's just a matter a configuring your web.xml to work with CAS,
as with any other CASsified app.

If you have any questions, please let me know.

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[google-appengine] Re: Can an app access the Program Files on the host machine

2010-04-27 Thread Wooble



On Apr 26, 7:11 pm, Hanh mercury24...@gmail.com wrote:
 I'm trying to create an app on the cloud, and it needs to launch a
 program from the Program Files on the host machine. I tried it with
 Windows Azure, and they do not allow this access. I just wonder if I
 can do this with Google App Engine?

 Thanks a lot!

What exactly do you mean by Program Files?  Almost certainly the
answer is no, but it would help if you could clarify exactly what
you're trying to do.

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[google-appengine] Getting around transactions for same entity group restrictions?

Hi,

I have a User class in my project, and I can't find a transactionally
safe method of creating relationships between users, because User
objects are always in their own entity group.

The simplest example I can come up with is a follow relationship (like
twitter). When a user follows another, both User objects should be
made aware of the relationship:

  class User {
  int mNumFollowing;
  int mNumFollowers;
  }

  class Follow {
  String mUsernameFollowed;
  String mUsernameFollower;
  }

Since both User objects involved are root entities, I can't use a
transaction to safely build the relationship. Ideally:

  tx.begin();
  Follow follow = new Follow(
  userJoe.getUsername(),
  userJane.getUsername());
  pm.makePersistent(follow);

  userJoe.mNumFollowing++;
  pm.makePersistent(userJoe);

  userJane.mNumFollowers++;
  pm.makePersistent(userJane);

  tx.commit();

I can make the Follow class an entity child of User, still the
relationship can't be done in a single transaction:

  tx.begin();
  userJoe.mNumFollowing++;
  pm.makePersistent(followForJoe);
  pm.makePersistent(userJoe);
  tx.commit();

  tx.begin();
  userJane.mNumFollowing++;
  pm.makePersistent(followForJane);
  pm.makePersistent(userJane);
  tx.commit();

the first transaction could succeed, and the second fail, leaving me
with a half-completed follow relationship.

What's the best way around same-entity-group-for-transactions in a
situation like this? Do we just have to deal with the fact that our
data might be incorrect? I could make User objects all children of a
single entity group, but that would probably be awful for performance
as every User object in the datastore would have to be locked to do a
transaction (just guessing, I don't know if that's true).

Thanks

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Re: [google-appengine] exec javac

2010-04-27 Thread Ikai L (Google)

Nope, you can't do this.

On a side note, if you were working in Python, you'd have eval().

On Mon, Apr 26, 2010 at 3:16 PM, David david.s.jan...@gmail.com wrote:

Is it possible to store and compile a java (or C or whatever language)
program on the server with Google App Engine, returning the results of
the compile to the web client?

This may seem like a strange question, but I really do want to send
text that constitutes a simple java program, compile it, and return
either the compiler error messages or the .class file to the web
client.

Thanks for any advice.

David

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Re: [google-appengine] exec javac

2010-04-27 Thread Ikai L (Google)

Well ... can't is a very strong word. Theoretically, you could probably
write a compiler using the available whitelist classes, but I suspect this
isn't what you are looking for ...

On Tue, Apr 27, 2010 at 10:03 AM, Ikai L (Google) ika...@google.com wrote:

Nope, you can't do this.

On a side note, if you were working in Python, you'd have eval().

On Mon, Apr 26, 2010 at 3:16 PM, David david.s.jan...@gmail.com wrote:

Is it possible to store and compile a java (or C or whatever language)
program on the server with Google App Engine, returning the results of
the compile to the web client?

Thanks for any advice.

David

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Google App Engine links:
Blog: http://googleappengine.blogspot.com
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Blog: http://googleappengine.blogspot.com
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Re: [google-appengine] Getting around transactions for same entity group restrictions?

2010-04-27 Thread Scott Ellis

You could fire a transactional task within the first transaction - and don't
let the task handler finish error free until the second modification is made
(so it keeps retrying).

On 28 April 2010 00:17, Mark mar...@gmail.com wrote:

 Hi,

 I have a User class in my project, and I can't find a transactionally
 safe method of creating relationships between users, because User
 objects are always in their own entity group.

 The simplest example I can come up with is a follow relationship (like
 twitter). When a user follows another, both User objects should be
 made aware of the relationship:

  class User {
  int mNumFollowing;
  int mNumFollowers;
  }

  class Follow {
  String mUsernameFollowed;
  String mUsernameFollower;
  }

 Since both User objects involved are root entities, I can't use a
 transaction to safely build the relationship. Ideally:

  tx.begin();
  Follow follow = new Follow(
  userJoe.getUsername(),
  userJane.getUsername());
  pm.makePersistent(follow);

  userJoe.mNumFollowing++;
  pm.makePersistent(userJoe);

  userJane.mNumFollowers++;
  pm.makePersistent(userJane);

  tx.commit();

 I can make the Follow class an entity child of User, still the
 relationship can't be done in a single transaction:

  tx.begin();
  userJoe.mNumFollowing++;
  pm.makePersistent(followForJoe);
  pm.makePersistent(userJoe);
  tx.commit();

  tx.begin();
  userJane.mNumFollowing++;
  pm.makePersistent(followForJane);
  pm.makePersistent(userJane);
  tx.commit();

 the first transaction could succeed, and the second fail, leaving me
 with a half-completed follow relationship.

 What's the best way around same-entity-group-for-transactions in a
 situation like this? Do we just have to deal with the fact that our
 data might be incorrect? I could make User objects all children of a
 single entity group, but that would probably be awful for performance
 as every User object in the datastore would have to be locked to do a
 transaction (just guessing, I don't know if that's true).

 Thanks

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Re: [google-appengine] ReadOnly Datastore and Task Queues

2010-04-27 Thread Robert Kluin

Perhaps you could check if the datastore is in read-only mode at the
beginning of the task, then do what ever action is appropriate for
your case (like raise an exception).

Robert




On Mon, Apr 26, 2010 at 4:45 AM, Matija matija.jerko...@gmail.com wrote:
 Is there way to pause task queue if datastore is currently in readonly
 state ?
 If task queue needs to persist something in datastore I need to left
 exception to be thrown so that it retries over and over until
 datastore is in normal state. Is there some other clever way to handle
 readonly datastore state in combination with task queue ?

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Re: [google-appengine] Server failed to serve the requests.

2010-04-27 Thread Robert Kluin

Were there any actual exceptions in the app's log?

Did you see the requests in the request log?

If you were using a custom domain, could you access the site directly
at the 'appname'.appspot.com url?

Robert






On Mon, Apr 26, 2010 at 9:52 AM, WeShine Tech
intelltest.ad...@gmail.com wrote:
 Hello,
        I have an application which requires resources just on some
 particular days. However today my application actually failed at my
 clients site. The application logs do read some high CPU usage for
 some of the url but that is it. It would completely stop responding at
 times for all and any requests. Please suggest me some work around for
 this problem. I have started my billing and have allowed a large
 number of resources to be consumed per day. The consumption shown in
 the admin console is as low as 1% of what has been allocated.

 Do let me know if there is any more information required to be shared
 from my side. But the problem is extremely critical and needs to be
 fixed as soon as possible.

 Any help is appreciated.

 Thanks and Regards,
 Anupam M.

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[google-appengine] Datastore inserts

2010-04-27 Thread Geoff


Hi,

I have an application which requires some relatively big inserts into
the datastore.  The amount of data isn't huge, but there are often
100,000 rows in each file upload (and I could be doing about 500-1000
per day).  At the moment I'm doing something like

for row in file:
new_row = RowType( somedata )
new_row.put()

However this is way too slow (CPU-wise) for my needs; a 40,000 line
file is taking about 4 CPU hours.

Is there some obviously way of optimising the insert which I don't
know about?

Geoff.

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[google-appengine] Re: WARNING appengine_rpc.py:399 ssl module not found.

2010-04-27 Thread J

I am having this problem also. Found this thread in Google Groups:
http://groups.google.com/group/google-appengine/browse_thread/thread/9eb30d64423a37ea.

The module requires Visual Studio to build and install. To have to
install Visual Studio just for this seems a bit heavy. If some kind
soul out there could build an MSI and post it, it would be wonderful.

On Apr 26, 7:37 pm, Wooble geoffsp...@gmail.com wrote:
 Have you tried to install the ssl module from pypi? If so, what
 problem are you having with installing it?

 On Apr 26, 5:25 pm, oddse minpeng2...@gmail.com wrote:





  Hello,

  I got this warning and can't upload files and communicate with app
  engine in order to unload file and create index for tables.

  WARNING appengine_rpc.py:399 ssl module not found.
  Without the ssl module, the identity of the remote host cannot be
  verified, and
  connections may NOT be secure. To fix this, please install the ssl
  module fromhttp://pypi.python.org/pypi/ssl.
  To learn more, seehttp://code.google.com/appengine/kb/general.html#rpcssl
  . 

  Need help to solve this problem.

  Thank you.

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[google-appengine] Re: How to drop indexes from deployed app?

2010-04-27 Thread Maxime

Hi,

I am having the same problem and I am looking for a solution. Thank
you for providing one Petrov as I was not able to find any...

Were you able to find something else ? I mean something easier and
cleaner than setting up a python app ?

Regards,
Maxime.

On 27 abr, 16:55, Petrov Aleksander ass.pet...@gmail.com wrote:
 bad typing... I made a mistake: should be like this
 4. in command line execute python appcfg.py vacuum_indexes
 new_project_template/

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[google-appengine] Re: Can't get entity by key

2010-04-27 Thread Hugo

Your Session class overrides Model.__init__? It has an intentionally
undocumented parameter _from_entity. When doing things like
overriding __init__, consider adding **kwargs, passing it on to the
super-class' constructor.

Hugo

On Apr 27, 12:10 am, Ralfeus ralf...@gmail.com wrote:
 Hi, everyone
 I'm trying to get an entity by its key. I have a class Session derived
 from db.Model
 Trying such code:
 Session.get('agd0ZXN0YXBwcg0LEgdTZXNzaW9uGBkM')
 I get the error:
 Traceback (most recent call last):
   File /var/www/google_appengine/google/appengine/ext/admin/
 __init__.py, line 218, in post
     exec(compiled_code, globals())
   File string, line 7, in module
   File /var/www/google_appengine/google/appengine/ext/db/
 __init__.py, line 992, in get
     results = get(keys, rpc=rpc)
   File /var/www/google_appengine/google/appengine/ext/db/
 __init__.py, line 1255, in get
     model = cls1.from_entity(entity)
   File /var/www/google_appengine/google/appengine/ext/db/
 __init__.py, line 1179, in from_entity
     instance = cls(None, _from_entity=True, **entity_values)
 TypeError: __init__() got an unexpected keyword argument
 '_from_entity'

 I tried Session.get(Key('agd0ZXN0YXBwcg0LEgdTZXNzaW9uGBkM'))
 Also I tried Session.gql(where __key__ = :1,
 db.Key('agd0ZXN0YXBwcg0LEgdTZXNzaW9uGBkM')).get()
 The error remains same in all cases.

 Is it bug? Or I miss something?
 Thank you in advance

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[google-appengine] Re: Getting around transactions for same entity group restrictions?

Hi Scott,

Thanks that's a great idea. I also just found this article which I
think I can adopt as well:

  http://blog.notdot.net/2009/9/Distributed-Transactions-on-App-Engine

I will try to convert that to java and post to the forum,

Thanks

On Apr 27, 10:15 am, Scott Ellis sje...@gmail.com wrote:
 You could fire a transactional task within the first transaction - and don't
 let the task handler finish error free until the second modification is made
 (so it keeps retrying).

 On 28 April 2010 00:17, Mark mar...@gmail.com wrote:





  Hi,

  I have a User class in my project, and I can't find a transactionally
  safe method of creating relationships between users, because User
  objects are always in their own entity group.

  The simplest example I can come up with is a follow relationship (like
  twitter). When a user follows another, both User objects should be
  made aware of the relationship:

   class User {
       int mNumFollowing;
       int mNumFollowers;
   }

   class Follow {
       String mUsernameFollowed;
       String mUsernameFollower;
   }

  Since both User objects involved are root entities, I can't use a
  transaction to safely build the relationship. Ideally:

   tx.begin();
   Follow follow = new Follow(
       userJoe.getUsername(),
       userJane.getUsername());
   pm.makePersistent(follow);

   userJoe.mNumFollowing++;
   pm.makePersistent(userJoe);

   userJane.mNumFollowers++;
   pm.makePersistent(userJane);

   tx.commit();

  I can make the Follow class an entity child of User, still the
  relationship can't be done in a single transaction:

   tx.begin();
   userJoe.mNumFollowing++;
   pm.makePersistent(followForJoe);
   pm.makePersistent(userJoe);
   tx.commit();

   tx.begin();
   userJane.mNumFollowing++;
   pm.makePersistent(followForJane);
   pm.makePersistent(userJane);
   tx.commit();

  the first transaction could succeed, and the second fail, leaving me
  with a half-completed follow relationship.

  What's the best way around same-entity-group-for-transactions in a
  situation like this? Do we just have to deal with the fact that our
  data might be incorrect? I could make User objects all children of a
  single entity group, but that would probably be awful for performance
  as every User object in the datastore would have to be locked to do a
  transaction (just guessing, I don't know if that's true).

  Thanks

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[google-appengine] App Engine downtime TOMORROW, Wed Apr 28 1-2p PDT

2010-04-27 Thread Wesley C (Google)

App Engine downtime TOMORROW, Wed Apr 28 1-2p PDT (GMT-7) and same
time next Wed, May 5

http://groups.google.com/group/google-appengine-downtime-notify/browse_thread/thread/4857b46e4e6ff0f9

please join the downtime notification group to be alerted on all such
planned downtimes. all apps will go into read-only mode for tomorrow's
downtime as well as next week's.

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[google-appengine] Progress Dialog... returning information?

2010-04-27 Thread maxfarrar

I have an application with a login screen that connects to a server
and authenticates.
I've looked up numerous tutorials on using Progress Dialogs and
Handlers, and they all explain how to run a seperate thread to (in my
case) send the REST request and check the response. However, my issue
is that my authentication function that I put my code in (below) needs
to return a boolean based on the response type. However, because I am
nesting classes, I can't reference the value returned by my code (the
response).

Here is a snippet:


...
public static boolean auth(String username, String password, Activity
login,Handler handler,int response){

try{
final ProgressDialog progress = ProgressDialog.show(login, Please
wait..., Connecting to server..., true);


 new Thread(new Runnable(){
public void run(){
try{
URL url = new URL(http://www.procoretech.com/api/
list_projects?login=+username+password=+password);
HttpURLConnection uc = 
(HttpURLConnection)url.openConnection();
uc.setDoInput(true);
uc.connect();
response = uc.getResponseCode();
//InputSource src = new 
InputSource(uc.getInputStream());
} catch (Exception e) {

}
   progress.dismiss();
   }).start();
...


That code is pasted together from different attempts but hopefully you
can see my problem. I need to pull the response value in the auth
function to return a boolean. Is there a standard way to do this?

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[google-appengine] flush cache from control panel

2010-04-27 Thread Nash-t

Is there a way to flush the cache from the control panel? I'd like to
be able to do this when I delete an entity that is cached. When can do
this in the dev environment, am I just missing the link?

Tim

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Re: [google-appengine] Server failed to serve the requests.

2010-04-27 Thread WeShine Tech

I did look into the problem and have been suggested that it could be due to
latency issues. Please could you guide me through as to how to fix this. I
have used the same code with more number of clients before but never faced a
problem like this.

The logs also show latency issues. And I did run the older version of my
application using the appspot url. The older version performed just fine.
However I did not try running the application using the appname.appspot.com
url.

On Tue, Apr 27, 2010 at 11:44 PM, Robert Kluin robert.kl...@gmail.comwrote:

Were there any actual exceptions in the app's log?

Did you see the requests in the request log?

If you were using a custom domain, could you access the site directly
at the 'appname'.appspot.com url?

Robert

On Mon, Apr 26, 2010 at 9:52 AM, WeShine Tech
intelltest.ad...@gmail.com wrote:
Hello,
I have an application which requires resources just on some
particular days. However today my application actually failed at my
clients site. The application logs do read some high CPU usage for
some of the url but that is it. It would completely stop responding at
times for all and any requests. Please suggest me some work around for
this problem. I have started my billing and have allowed a large
number of resources to be consumed per day. The consumption shown in
the admin console is as low as 1% of what has been allocated.

Do let me know if there is any more information required to be shared
from my side. But the problem is extremely critical and needs to be
fixed as soon as possible.

Any help is appreciated.

Thanks and Regards,
Anupam M.

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[google-appengine] Re: data structure to implement some of your friends also like this feature.

2010-04-27 Thread Herbert

Hi Nick

Thank you. One thing I'm still a bit confused about index. I had the
impression that if I've executed all kinds of queries before I deploy,
all required indexes would be included, am I correct?

Does building a custom index improve performance on complex queries
even though it is not required? Or I could just stick to the rules
from the doc, and make sure I cover all queries before I deploy?

Thanks!

On Apr 27, 6:59 pm, Nick Johnson (Google) nick.john...@google.com
wrote:
Hi Herbert,

-Nick

On Mon, Apr 26, 2010 at 3:20 PM, Herbert herber...@gmail.com wrote:
Sorry, suddenly got a thought on it.

Can I do two equality check on both User.friends and User.likes ?
would that be cause an exploding index?

I.E. User.all().filter(friends =, me).filter(likes =, A).fetch(3)

thanks!
Herbert

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[google-appengine] Re: flush cache from control panel

2010-04-27 Thread Wooble



On Apr 27, 10:34 pm, Nash-t timna...@gmail.com wrote:
 Is there a way to flush the cache from the control panel? I'd like to
 be able to do this when I delete an entity that is cached. When can do
 this in the dev environment, am I just missing the link?

There isn't a built-in way, but you could add a page that calls
memcache.flush_all() easily enough.

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Re: [google-appengine] Server failed to serve the requests.

2010-04-27 Thread Robert Kluin

Anupam,
  Are you saying that you have other clients (customers) running the
same code on different deployments, or are you saying you have loaded
this app more heavily while running the current code?  When you say
the log shows latency issues I assume you mean the requests are taking
a lot of CPU time?

It sounds like the app is not very high traffic.  Could this be the
cold start issue?  If you hit the site a lot (once every couple
seconds) does it respond OK?


Robert







On Tue, Apr 27, 2010 at 11:35 PM, WeShine Tech
intelltest.ad...@gmail.com wrote:
 I did look into the problem and have been suggested that it could be due to
 latency issues. Please could you guide me through as to how to fix this. I
 have used the same code with more number of clients before but never faced a
 problem like this.
 The logs also show latency issues. And I did run the older version of my
 application using the appspot url. The older version performed just fine.
 However I did not try running the application using the
 appname.appspot.com url.


 On Tue, Apr 27, 2010 at 11:44 PM, Robert Kluin robert.kl...@gmail.com
 wrote:

 Were there any actual exceptions in the app's log?

 Did you see the requests in the request log?

 If you were using a custom domain, could you access the site directly
 at the 'appname'.appspot.com url?

 Robert






 On Mon, Apr 26, 2010 at 9:52 AM, WeShine Tech
 intelltest.ad...@gmail.com wrote:
  Hello,
         I have an application which requires resources just on some
  particular days. However today my application actually failed at my
  clients site. The application logs do read some high CPU usage for
  some of the url but that is it. It would completely stop responding at
  times for all and any requests. Please suggest me some work around for
  this problem. I have started my billing and have allowed a large
  number of resources to be consumed per day. The consumption shown in
  the admin console is as low as 1% of what has been allocated.
 
  Do let me know if there is any more information required to be shared
  from my side. But the problem is extremely critical and needs to be
  fixed as soon as possible.
 
  Any help is appreciated.
 
  Thanks and Regards,
  Anupam M.
 
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Re: [google-appengine] Server failed to serve the requests.

2010-04-27 Thread WeShine Tech

Hello Robert,

Are you saying that you have other clients (customers) running the
same code on different deployments ?
No. So what happened is at my clients site the
application stopped responding. So I started using the earlier versions of
my application and those seemed to work fine.

When you say the log shows latency issues I assume you mean the requests
are taking
a lot of CPU time?
That is correct. But the same requests work absolutely fine otherwise.
So why would some requests take a lot of CPU time only on
some occasions where as work efficiently most of the times? Could you share
some tippers for resolving this issue.

The application is not a very high traffic one because of its nature.
However after receiving high amount of load for almost two hours it went
down. Also it has performed very well with more traffic in the past. So I am
not sure it could be the Cold Start.

Thanks and Regards,
Anupam M.

On Wed, Apr 28, 2010 at 9:31 AM, Robert Kluin robert.kl...@gmail.comwrote:

Anupam,
Are you saying that you have other clients (customers) running the
same code on different deployments, or are you saying you have loaded
this app more heavily while running the current code? When you say
the log shows latency issues I assume you mean the requests are taking
a lot of CPU time?

It sounds like the app is not very high traffic. Could this be the
cold start issue? If you hit the site a lot (once every couple
seconds) does it respond OK?

Robert

On Tue, Apr 27, 2010 at 11:35 PM, WeShine Tech
intelltest.ad...@gmail.com wrote:
I did look into the problem and have been suggested that it could be due
to
latency issues. Please could you guide me through as to how to fix this.
I
have used the same code with more number of clients before but never
faced a
problem like this.
The logs also show latency issues. And I did run the older version of my
application using the appspot url. The older version performed just fine.
However I did not try running the application using the
appname.appspot.com url.

On Tue, Apr 27, 2010 at 11:44 PM, Robert Kluin robert.kl...@gmail.com
wrote:

Were there any actual exceptions in the app's log?

Did you see the requests in the request log?

If you were using a custom domain, could you access the site directly
at the 'appname'.appspot.com url?

Robert

Do let me know if there is any more information required to be shared
from my side. But the problem is extremely critical and needs to be
fixed as soon as possible.

Any help is appreciated.

Thanks and Regards,
Anupam M.

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[google-appengine] skip_files also for Java?

2010-04-27 Thread Jaroslav Záruba

Is there something similar to skip_files in Java?

On Apr 12, 9:14 pm, Wooble geoffsp...@gmail.com wrote:
 http://code.google.com/appengine/docs/java/config/appconfig.html#Stat...

 You should be able to exclude them.

 On Apr 12, 2:47 pm, therealjz thereal...@gmail.com wrote:



  Exactly what I need but I'm using Java. Anything similar for Java
  apps?

  On Apr 12, 11:39 am, david ignacio deigna...@gmail.com wrote:

   take a look at the skipping files section of the app.yaml

  http://code.google.com/appengine/docs/python/config/appconfig.html#Sk...

   On Mon, Apr 12, 2010 at 09:25, therealjz thereal...@gmail.com wrote:
Hi everyone,

I'm using the AppEngine plugin for Eclipse and the Subversive plugins
for svn. My problem is that when I publish my AppEngine project, it
uploads the .svn directories also. So I get errors from AppEngine
about duplicate jars being found. Is there any way to keep the
AppEngine from publishing those files? Seems like it should be an easy
problem but I'm not sure what to do.

Thanks

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[google-appengine] Trouble creating a named key