date:20100406

Re: [appengine-java] Initialize local datastore exception

2010-04-06 Thread Wayne Fay

 »»» EXCEPTION «««
 Exception in thread main java.lang.NullPointerException: No API
 environment is registered for this thread.

This generally means you haven't set things up properly. Follow the directions:
http://code.google.com/appengine/docs/java/tools/localunittesting.html

Wayne

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[appengine-java] Re: Best way to perform search on DataStore - Design Question

2010-04-06 Thread Toby

Hello,

I am wondering if text search is actually on the official road map and
if so when it will be available. If not, would it make sense to start
a google code project to do our own implementation?  I am thinking of
something simple and light without the need of lots of jar. I think it
is quite some work and it would be worthless if GAE will have this
feature in the near future. Also I guess it can be implemented more
efficiently on google side reusing all the infrastructure that they
have already in place.

Cheers,
Toby

On Mar 29, 6:32 am, Tristan tristan.slomin...@gmail.com wrote:
 another way is to implement a full-textsearchyourself...
 implementing this would work:

 http://www.miislita.com/term-vector/term-vector-3.html (use tri-grams
 instead of full words as tokens)

 i would recommend low-level datastore api for that, also, your index
 term entities will blow up beyond 1MB, i built mindash-datastore to
 handle that

 :) or you can wait for a few months for Google

 On Mar 25, 3:05 pm, niraj njun...@gmail.com wrote:



  I am debating if I should use Compass or wait for Google to release
  something.

  I can wait for 3-4 months as my website is going to take that amount
  of time to complete.

  Niraj

  On Mar 16, 3:16 am, Toby toby.ro...@gmail.com wrote:

   I am using compass as well and it works fine. The indexing part is
   costly and you might need to do task queue if you reindex large amount
   of data. Starting thesearchmanager is slow and it happens a lot due
   to the suspend policy.

   You can also take a look at this 
   project:http://code.google.com/p/gaelucene/

   I hope there will be a native solution by GAE one day (is there an
   issue to vote for?)

   On Mar 16, 10:21 am, yjun hu itswa...@gmail.com wrote:

haha, up to now,i use compass okay!

On Tue, Mar 16, 2010 at 8:53 AM, objectuser kevin.k.le...@gmail.com 
wrote:
 I think there are a lot of posts here that conclude Compass is not
 viable.  Has that changed?

 On Mar 15, 12:23 am, yjun hu itswa...@gmail.com wrote:
  you can try compass to make you project searchable. a simple demo
 herehttp://hapeblog.appspot.com/blog.shtml?id=7002

  On Sun, Mar 14, 2010 at 8:36 PM, John Patterson 
  jdpatter...@gmail.com
 wrote:

   Interesting to see the existence protected
 Query.setFullTextSearch(String)
   method when you open the Query class in Eclipse.  I suppose it 
   won't be
 too
   far away.  I can't wait to see if they just give us a
 take-it-or-leave-it
   solution or also the tools required to roll your own.

   On 14 Mar 2010, at 15:05, Robert Lancer wrote:

    Haha, like many of us you probably thought that GOOGLE app engine
   would have decenttextsearchcapabilities.

   It looks like your doing all you can do by creating the inverse 
   table,
   you may just want to star
  http://code.google.com/p/googleappengine/issues/detail?id=217

   On Mar 13, 8:59 pm, niraj njun...@gmail.com wrote:

   My case:
   I am building a website that has several searchable fields from
   various entities (example Artist names from artist entity , 
   Album
   names from album entity). To have an efficientsearchcapability I
   have defined another Entity - SearchType which carries the 
   Searchable
   string and the Foreign key to the Entity. Instead of querying 
   all the
   Entities one my one - I query SearchType.

   My preliminary tests indicate that the query  performance on
   SearchType is not great (the names are indexed) . I need google
   suggest like quick results in a drop down. What is the best way 
   to
   design this.

   I have considered Memcache , but I dont think I can run queries 
   on
   Memcache . i.e I am running a startsWith() query on JDO today.

   Any best practices .

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Re: [appengine-java] Re: Best way to perform search on DataStore - Design Question

2010-04-06 Thread John Patterson

Yes full text search is on the road map.  It can't be far away because  
some of the implementation has already slipped into the current  
release.  See the protected method Query.setFullTextSearch()


On 6 Apr 2010, at 16:04, Toby wrote:


Hello,

I am wondering if text search is actually on the official road map and
if so when it will be available. If not, would it make sense to start
a google code project to do our own implementation?  I am thinking of
something simple and light without the need of lots of jar. I think it
is quite some work and it would be worthless if GAE will have this
feature in the near future. Also I guess it can be implemented more
efficiently on google side reusing all the infrastructure that they
have already in place.

Cheers,
Toby

On Mar 29, 6:32 am, Tristan tristan.slomin...@gmail.com wrote:

another way is to implement a full-textsearchyourself...
implementing this would work:

http://www.miislita.com/term-vector/term-vector-3.html (use tri-grams
instead of full words as tokens)

i would recommend low-level datastore api for that, also, your index
term entities will blow up beyond 1MB, i built mindash-datastore to
handle that

:) or you can wait for a few months for Google

On Mar 25, 3:05 pm, niraj njun...@gmail.com wrote:




I am debating if I should use Compass or wait for Google to release
something.



I can wait for 3-4 months as my website is going to take that amount
of time to complete.



Niraj



On Mar 16, 3:16 am, Toby toby.ro...@gmail.com wrote:



I am using compass as well and it works fine. The indexing part is
costly and you might need to do task queue if you reindex large  
amount

of data. Starting thesearchmanager is slow and it happens a lot due
to the suspend policy.



You can also take a look at this project:http://code.google.com/p/gaelucene/



I hope there will be a native solution by GAE one day (is there an
issue to vote for?)



On Mar 16, 10:21 am, yjun hu itswa...@gmail.com wrote:



haha, up to now,i use compass okay!


On Tue, Mar 16, 2010 at 8:53 AM, objectuser  
kevin.k.le...@gmail.com wrote:
I think there are a lot of posts here that conclude Compass is  
not

viable.  Has that changed?



On Mar 15, 12:23 am, yjun hu itswa...@gmail.com wrote:
you can try compass to make you project searchable. a simple  
demo

herehttp://hapeblog.appspot.com/blog.shtml?id=7002


On Sun, Mar 14, 2010 at 8:36 PM, John Patterson  
jdpatter...@gmail.com

wrote:



Interesting to see the existence protected

Query.setFullTextSearch(String)
method when you open the Query class in Eclipse.  I suppose  
it won't be

too

far away.  I can't wait to see if they just give us a

take-it-or-leave-it

solution or also the tools required to roll your own.



On 14 Mar 2010, at 15:05, Robert Lancer wrote:


 Haha, like many of us you probably thought that GOOGLE app  
engine

would have decenttextsearchcapabilities.


It looks like your doing all you can do by creating the  
inverse table,

you may just want to star
http://code.google.com/p/googleappengine/issues/detail?id=217



On Mar 13, 8:59 pm, niraj njun...@gmail.com wrote:



My case:
I am building a website that has several searchable fields  
from
various entities (example Artist names from artist entity ,  
Album
names from album entity). To have an  
efficientsearchcapability I
have defined another Entity - SearchType which carries the  
Searchable
string and the Foreign key to the Entity. Instead of  
querying all the

Entities one my one - I query SearchType.



My preliminary tests indicate that the query  performance on
SearchType is not great (the names are indexed) . I need  
google
suggest like quick results in a drop down. What is the best  
way to

design this.


I have considered Memcache , but I dont think I can run  
queries on
Memcache . i.e I am running a startsWith() query on JDO  
today.



Any best practices .



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[appengine-java] Re: JAXB Support

2010-04-06 Thread Brian

I've been working with the tutorial mentioned above and it runs fine
in my local environment, but when I deploy to GAE JAXB is throwing the
exception detailed above. I'm baffled as to why this is running
locally but failing on GAE. I though the local environment was
supposed to replicate the actual GAE production environment?  Does
anyone have any ideas? I'm really stuck with this one...

On 2 Apr, 17:37, L. Kirven lrkir...@gmail.com wrote:
 Brian,

 I am doing exactly the same thing.  I followed the blog below and didn't
 have any problems.  I hope that this helps.

 http://tugdualgrall.blogspot.com/2010/02/create-and-deploy-jax-rs-res...





 On Fri, Apr 2, 2010 at 9:55 AM, Brian hannawaybr...@googlemail.com wrote:
  Hi,
  I've run into an issue with JAXB on GAE. I have set up a simple
  project using Jersey to expose a RESTful web service and am using JAXB
  for marshalling/unmarshalling. The project runs fine in my local
  eclipse environment but when I upload to GAE and send a request to the
  web service I am getting a JAXB exception (see stack trace below). I
  am using the latest version of JAXB and the latest version of GAE SDK.
  According to the white list JAXB should now be supported so I'm not
  sure what's going on. Any help to resolve this issue would be greatly
  appreciated.

  Uncaught exception from servlet
  java.lang.ExceptionInInitializerError
         at

  com.sun.xml.bind.v2.runtime.reflect.opt.AccessorInjector.prepare(AccessorIn 
  jector.java:
  79)
         at

  com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(Optimi 
  zedAccessorFactory.java:
  165)
         at com.sun.xml.bind.v2.runtime.reflect.Accessor
  $FieldReflection.optimize(Accessor.java:256)
         at

  com.sun.xml.bind.v2.runtime.property.ArrayProperty.init(ArrayProperty.jav 
  a:
  65)
         at

  com.sun.xml.bind.v2.runtime.property.ArrayERProperty.init(ArrayERProperty 
  .java:
  84)
         at

  com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.init(ArrayEleme 
  ntProperty.java:
  96)
         at

  com.sun.xml.bind.v2.runtime.property.ArrayElementNodeProperty.init(ArrayE 
  lementNodeProperty.java:
  58)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
  Method)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown
  Source)
         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
  Source)
         at java.lang.reflect.Constructor.newInstance(Constructor.java:33)
         at

  com.sun.xml.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory 
  .java:
  124)
         at

  com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.init(ClassBeanInfoImpl.java 
  :
  179)
         at

  com.sun.xml.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.jav 
  a:
  515)
         at
  com.sun.xml.bind.v2.runtime.JAXBContextImpl.init(JAXBContextImpl.java:
  330)
         at com.sun.xml.bind.v2.runtime.JAXBContextImpl
  $JAXBContextBuilder.build(JAXBContextImpl.java:1140)
         at
  com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:
  154)
         at
  com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:
  121)
         at
  com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:
  202)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
         at java.lang.reflect.Method.invoke(Unknown Source)
         at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:159)
         at javax.xml.bind.ContextFinder.find(ContextFinder.java:311)
         at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
         at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
         at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
         at

  com.sun.jersey.server.impl.wadl.WadlApplicationContextImpl.init(WadlAppli 
  cationContextImpl.java:
  66)
         at
  com.sun.jersey.server.impl.wadl.WadlFactory.init(WadlFactory.java:
  94)
         at

  com.sun.jersey.server.impl.application.WebApplicationImpl.initWadl(WebAppli 
  cationImpl.java:
  1207)
         at

  com.sun.jersey.server.impl.application.WebApplicationImpl.processRootResour 
  ces(WebApplicationImpl.java:
  1106)
         at

  com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebAppli 
  cationImpl.java:
  912)
         at

  com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebAppli 
  cationImpl.java:
  589)
         at

  com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletConta 
  iner.java:
  403)
         at com.sun.jersey.spi.container.servlet.ServletContainer
  $InternalWebComponent.initiate(ServletContainer.java:252)
         at
  com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:
  550)
         at

[appengine-java] Issue with google plugin for eclipse

2010-04-06 Thread joradom

The plugin doesn't allow me to create a new Servlet, when calling the
create servlet wizard the project field appears greyed and empty.

I can create a class, or any file, but of course, much more things to
write are needed.

just curious to know if it's a normal behaviour or some bug?

I'm using Ubuntu karmic and eclipse  ganimedes for java EE, with
latests google  plugin and sdks (just made a fresh install 3 days
ago.)

thx

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[appengine-java] How can I place JSession into cookie. Google app engine.

2010-04-06 Thread Alexander Rodnin


Сould you please tell me how to place the session identifier into the
cookie, if  you are working with google app engine.

Thanks.

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[appengine-java] Eclipse

2010-04-06 Thread 1900's

eclipse.buildId=unknown
java.version=1.6.0_18
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Command-line arguments:  -os win32 -ws win32 -arch x86


Error
Tue Apr 06 14:38:47 CST 2010
Unable to update app: Failed to compile the generated JSP java files.

See the deployment console for more details

com.google.appengine.tools.admin.AdminException: Unable to update app:
Failed to compile the generated JSP java files.
at
com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:
62)
at
com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:
271)
at
com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:
145)
at
org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:
38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: com.google.appengine.tools.admin.JspCompilationException:
Failed to compile the generated JSP java files.
at
com.google.appengine.tools.admin.Application.compileJavaFiles(Application.java:
432)
at
com.google.appengine.tools.admin.Application.compileJsps(Application.java:
392)
at
com.google.appengine.tools.admin.Application.createStagingDirectory(Application.java:
268)
at
com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:
54)
... 4 more


why?

web.xml  Source Code？

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[appengine-java] Adding Task-Queue Tasks in Batch?

2010-04-06 Thread Seth Ladd

Aloha,

The docs for the Java implementation of the Task Queue mentions this:

maximum number of tasks that can be added in a batch - 100

However, I can't find any reference to adding tasks in a batch.  What
does the above mean, and where can I find more information about it?
I'd like to be able to add many tasks in a batch, if that's
possible.

I am aware of the 5 tasks per transaction limit.

Thanks!
Seth

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[appengine-java] Re: Adding Task-Queue Tasks in Batch?

2010-04-06 Thread Keith

From 
http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/labs/taskqueue/Queue.html

add(java.lang.IterableTaskOptions taskOptions)
  Submits tasks to this queue.

On Apr 6, 9:54 am, Seth Ladd sethl...@gmail.com wrote:
 Aloha,

 The docs for the Java implementation of the Task Queue mentions this:

 maximum number of tasks that can be added in a batch - 100

 However, I can't find any reference to adding tasks in a batch.  What
 does the above mean, and where can I find more information about it?
 I'd like to be able to add many tasks in a batch, if that's
 possible.

 I am aware of the 5 tasks per transaction limit.

 Thanks!
 Seth

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[appengine-java] Funny behavior with memcache.increment() below zero

2010-04-06 Thread Nacho Coloma

Hi all,

I am trying to use memcache.increment to move to negative values,
starting at 0. According to the javadoc[1]:

To facilitate use as an atomic countdown, incrementing by a negative
value (i.e. decrementing) will not go below zero: incrementing 2 by -5
will return 0, not -3. However, due to the way numbers are stored,
decrementing -3 by -5 will result in -8; so the zero-floor rule only
applies to decrementing numbers that were positive.

What is the rationale behind this, and why is 0 considered positive? I
may have missed something, but I did not understand a similar behavior
in python's memcache.decr() docs. If my counter can hold positive or
negative values, what options do I have apart from initializing at
2^30?

-- Nacho

[1]
http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheService.html#increment(java.lang.Object,%20long)

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Re: [appengine-java] JDO Relationship Performance Problems - what am I doing wrong?

2010-04-06 Thread Ikai L (Google)

For speed, you'll get the most gains if you denormalize when possible - yes,
the relational purists are going to riot, but you don't have many of the
benefits of normalization anyway such as foreign key constraints or native
joins.

If that isn't an option - and I really do recommend looking into it where it
makes sense - if you're able to retrieve keys, we may also be able to make
use of batch queries by key.

On Mon, Apr 5, 2010 at 2:59 PM, Matt Hall matt.h...@gmail.com wrote:

Hi Everyone,

I've been trying for the past while to get our relatively simple JDO
based site to run at a reasonable speed, but I'm failing and I'd love
any suggestions. I'll describe it as succinctly as possible to
hopefully keep your interest :)

* The basic structure is a User - Order - Line items type
structure.
* The main query performed is Orders for a user.
* A user usually has around 10 orders, each order has under 100 line
items.
* The Order - Items relationship is done as a One-to-many owned
relationship.

My problem is that the basic request the site handles: Get all orders
for a user and do something based on the line items is very slow. In
real response time, my average is now 1.5 seconds, and some of the
users are seeing 20 second response times. Clearly not ok.

What appears to be slow, after profiling with the new app stats tool
is that each line item is getting loaded as it's used (lazy loading),
which works great in some cases but terrible in this case since each
item takes 20-30ms to load.

I have tried:

* Moving items into the default fetch group for orders, seems to have
no effect (may not even be possible due to limitations of joins)
* Level 2 caching with memcache - not much effect either since only
the individual line items are cached, not the whole List, so we still
pay a price in round trip to the cache on each line item.
* A sort of wacky cache that I wrote on top of the JDO managed
relationship to cache the whole collection. This went poorly and
resulted in odd data inconsistencies, probably because I did something
wrong but the whole thing felt wrong.

So my question is - what am I doing wrong? What's the best/standard
way to represent a Master - Detail type relationship, where the total
items for a user will be relatively small but requests need to work
with a fair number of them.

Thanks for any suggestions, I'd be happy to answer any questions if
what I've written isn't clear.

Matt

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Re: [appengine-java] uncaught exception from servlet

2010-04-06 Thread Ikai L (Google)

Can you post your project somewhere?

On Mon, Apr 5, 2010 at 8:07 PM, Jeevan jeevan.don...@gmail.com wrote:

 Am developing an app for ma college called cloud based teaching system
 and am making use of blogger data  api.

 Am getting an severe error in the appengine Logs called uncaught
 exception fron servlet

 here is the issue


 Uncaught exception from servlet
 javax.servlet.UnavailableException: Initialization failed.
at

 com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler(AppVersionHandlerMap.java:
 200)
at

 com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler(AppVersionHandlerMap.java:
 168)
at

 com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:
 123)
at
 com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:
 243)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
 $6.handleBlockingRequest(RuntimePb.java:5485)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
 $6.handleBlockingRequest(RuntimePb.java:5483)
at

 com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:
 24)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:
 398)
at com.google.net.rpc.impl.Server$2.run(Server.java:852)
at
 com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:
 56)
at

 com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java:
 536)
at com.google.net.rpc.impl.Server.startRpc(Server.java:807)
at com.google.net.rpc.impl.Server.processRequest(Server.java:369)
at

 com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java:
 442)
at
 com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java:
 319)
at
 com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java:
 290)
at com.google.net.async.Connection.handleReadEvent(Connection.java:
 474)
at

 com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java:
 831)
at
 com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java:
 207)
at com.google.net.async.EventDispatcher.loop(EventDispatcher.java:
 103)
at
 com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java:
 251)
at com.google.apphosting.runtime.JavaRuntime
 $RpcRunnable.run(JavaRuntime.java:404)
at java.lang.Thread.run(Unknown Source)


 How do i debug this,let me know

 thank you

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Developer Programs Engineer, Google App Engine
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Re: [appengine-java] Issue with google plugin for eclipse

2010-04-06 Thread Ikai L (Google)

What kind of project have you created? This looks like the issue filed here:

http://code.google.com/p/googleappengine/issues/detail?id=2306

http://code.google.com/p/googleappengine/issues/detail?id=2306You'll have
to provide more detail, though. How are you creating the project?

On Tue, Apr 6, 2010 at 5:31 AM, joradom jora...@gmail.com wrote:

The plugin doesn't allow me to create a new Servlet, when calling the
create servlet wizard the project field appears greyed and empty.

I can create a class, or any file, but of course, much more things to
write are needed.

just curious to know if it's a normal behaviour or some bug?

I'm using Ubuntu karmic and eclipse ganimedes for java EE, with
latests google plugin and sdks (just made a fresh install 3 days
ago.)

thx

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Developer Programs Engineer, Google App Engine
http://googleappengine.blogspot.com | http://twitter.com/app_engine

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[appengine-java] changes regarding 1000-result query limit

2010-04-06 Thread AJ

hi,

Does the 1000-query result limit still hold for an individual query?
(I know that the use of query cursors now allows  1000 results total
to be fetched).

Comments such as this:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/88bb6df3d8cf5f78/5a98f713e9bc665f?lnk=gstq=1000+result+limit#5a98f713e9bc665f
 cursors are a way for you to work with datasets larger than 1000.

lead me to think that a single query fetch will still *not* return
more than 1000 results.  Is this right?  If so, I can't seem to find
it in the documentation anywhere.

(I have no current datasets this large, so thought I would ask to see
if someone already knows the answer definitively).

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Re: [appengine-java] How can I place JSession into cookie. Google app engine.

2010-04-06 Thread Ikai L (Google)

This seems redundant, even outside of App Engine. You wouldn't want to place
a JSessionId into a cookie, since that is identified *by* a cookie.

Likely what you are looking for is servlet session support. App Engine
supports this, albeit with gotchas:

http://code.google.com/appengine/docs/java/config/appconfig.html

http://code.google.com/appengine/docs/java/config/appconfig.htmlNote that
since session data is stored in a combination of memcache and persistent
store that you'll have to resave objects when they mutate. You'll also need
to manually garbage collect your session data.

2010/4/6 Alexander Rodnin alexander.rod...@gmail.com

Сould you please tell me how to place the session identifier into the
cookie, if you are working with google app engine.

Thanks.

--
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Developer Programs Engineer, Google App Engine
http://googleappengine.blogspot.com | http://twitter.com/app_engine

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Re: [appengine-java] Funny behavior with memcache.increment() below zero

2010-04-06 Thread Ikai L (Google)

I'm looking at the standard memcached documentation:

http://github.com/memcached/memcached/blob/master/doc/protocol.txt

http://github.com/memcached/memcached/blob/master/doc/protocol.txtNote
that underflow in the decr command is caught: if a client tries

to decrease the value below 0, the new value will be 0. Overflow in
the incr command will wrap around the 64 bit mark.

I'm not sure why our version of memcached behaves the way it does. I suspect
it has to do with storing numbers as either signed or unsigned ints
depending on what you first set the value to, with unsigned ints being the
90% case.

When in doubt, use the solution that results in the least confusion. And
document.

On Tue, Apr 6, 2010 at 9:09 AM, Nacho Coloma icol...@gmail.com wrote:

Hi all,

I am trying to use memcache.increment to move to negative values,
starting at 0. According to the javadoc[1]:

To facilitate use as an atomic countdown, incrementing by a negative
value (i.e. decrementing) will not go below zero: incrementing 2 by -5
will return 0, not -3. However, due to the way numbers are stored,
decrementing -3 by -5 will result in -8; so the zero-floor rule only
applies to decrementing numbers that were positive.

What is the rationale behind this, and why is 0 considered positive? I
may have missed something, but I did not understand a similar behavior
in python's memcache.decr() docs. If my counter can hold positive or
negative values, what options do I have apart from initializing at
2^30?

-- Nacho

[1]

http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheService.html#increment(java.lang.Object,%20long)

--
Ikai Lan
Developer Programs Engineer, Google App Engine
http://googleappengine.blogspot.com | http://twitter.com/app_engine

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Re: [appengine-java] Re: JAXB Support

2010-04-06 Thread Toby Reyelts

It looks like you're bundling the latest 2.2 JAXB RI. Apparently they made a
change in that release which requires access to the protected method,
ClassLoader.findLoadedClass. This makes it incompatible with App Engine. If
you can use the previous release (2.1.2), a built-in version of JAXB, or
even possibly a different implementation of 2.2, then you shouldn't see this
problem anymore.

On Tue, Apr 6, 2010 at 7:43 AM, Brian hannawaybr...@googlemail.com wrote:

 I've been working with the tutorial mentioned above and it runs fine
 in my local environment, but when I deploy to GAE JAXB is throwing the
 exception detailed above. I'm baffled as to why this is running
 locally but failing on GAE. I though the local environment was
 supposed to replicate the actual GAE production environment?


The local environment is just a simulation of the production environment. We
put a lot of effort into emulating it, but there are some edge-cases that
are much more difficult to handle than others.


  Does
 anyone have any ideas? I'm really stuck with this one...

 On 2 Apr, 17:37, L. Kirven lrkir...@gmail.com wrote:
  Brian,
 
  I am doing exactly the same thing.  I followed the blog below and didn't
  have any problems.  I hope that this helps.
 
  http://tugdualgrall.blogspot.com/2010/02/create-and-deploy-jax-rs-res...
 
 
 
 
 
  On Fri, Apr 2, 2010 at 9:55 AM, Brian hannawaybr...@googlemail.com
 wrote:
   Hi,
   I've run into an issue with JAXB on GAE. I have set up a simple
   project using Jersey to expose a RESTful web service and am using JAXB
   for marshalling/unmarshalling. The project runs fine in my local
   eclipse environment but when I upload to GAE and send a request to the
   web service I am getting a JAXB exception (see stack trace below). I
   am using the latest version of JAXB and the latest version of GAE SDK.
   According to the white list JAXB should now be supported so I'm not
   sure what's going on. Any help to resolve this issue would be greatly
   appreciated.
 
   Uncaught exception from servlet
   java.lang.ExceptionInInitializerError
  at
 
  
 com.sun.xml.bind.v2.runtime.reflect.opt.AccessorInjector.prepare(AccessorIn
 jector.java:
   79)
  at
 
  
 com.sun.xml.bind.v2.runtime.reflect.opt.OptimizedAccessorFactory.get(Optimi
 zedAccessorFactory.java:
   165)
  at com.sun.xml.bind.v2.runtime.reflect.Accessor
   $FieldReflection.optimize(Accessor.java:256)
  at
 
  
 com.sun.xml.bind.v2.runtime.property.ArrayProperty.init(ArrayProperty.jav
 a:
   65)
  at
 
  
 com.sun.xml.bind.v2.runtime.property.ArrayERProperty.init(ArrayERProperty
 .java:
   84)
  at
 
  
 com.sun.xml.bind.v2.runtime.property.ArrayElementProperty.init(ArrayEleme
 ntProperty.java:
   96)
  at
 
  
 com.sun.xml.bind.v2.runtime.property.ArrayElementNodeProperty.init(ArrayE
 lementNodeProperty.java:
   58)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
   Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown
   Source)
  at
 sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
   Source)
  at
 java.lang.reflect.Constructor.newInstance(Constructor.java:33)
  at
 
  
 com.sun.xml.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory
 .java:
   124)
  at
 
  
 com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.init(ClassBeanInfoImpl.java
 :
   179)
  at
 
  
 com.sun.xml.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.jav
 a:
   515)
  at
  
 com.sun.xml.bind.v2.runtime.JAXBContextImpl.init(JAXBContextImpl.java:
   330)
  at com.sun.xml.bind.v2.runtime.JAXBContextImpl
   $JAXBContextBuilder.build(JAXBContextImpl.java:1140)
  at
   com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:
   154)
  at
   com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:
   121)
  at
   com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:
   202)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
 Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at
 javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:159)
  at javax.xml.bind.ContextFinder.find(ContextFinder.java:311)
  at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
  at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
  at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
  at
 
  
 com.sun.jersey.server.impl.wadl.WadlApplicationContextImpl.init(WadlAppli
 cationContextImpl.java:
   66)
  at
   com.sun.jersey.server.impl.wadl.WadlFactory.init(WadlFactory.java:
   94)
  at

[appengine-java] List of sub entities does not obay list order

2010-04-06 Thread Gunnar

Hi,
I need to have a one to many owned relationship and be able to reorder
the list.
The list is stored in the data store with new elements at the end
although I add the sub entity first in the ArrayList.

Any suggestions?

This is the result from my test servlet.
deleted all objects
persisted entity: 23
before add MyEntity [keyId=23, myList=[]]
added sub-entity one
after add: MyEntity [keyId=23, myList=[SubEntity [name=one, id=24]]]
query
MyEntity [keyId=23, myList=[SubEntity [name=one, id=24]]]
SubEntity [name=one, id=24]
-
before add MyEntity [keyId=23, myList=[SubEntity [name=one, id=24]]]
added sub-entity two
after add: MyEntity [keyId=23, myList=[SubEntity [name=two, id=25],
SubEntity [name=one, id=24]]]
query
MyEntity [keyId=23, myList=[SubEntity [name=one, id=24], SubEntity
[name=two, id=25]]]
SubEntity [name=one, id=24]
SubEntity [name=two, id=25]
-
before add MyEntity [keyId=23, myList=[SubEntity [name=two, id=25],
SubEntity [name=one, id=24]]]
added sub-entity three
after add: MyEntity [keyId=23, myList=[SubEntity [name=three, id=26],
SubEntity [name=two, id=25], SubEntity [name=one, id=24]]]
query
MyEntity [keyId=23, myList=[SubEntity [name=one, id=24], SubEntity
[name=two, id=25], SubEntity [name=three, id=26]]]
SubEntity [name=one, id=24]
SubEntity [name=two, id=25]
SubEntity [name=three, id=26]
-
before reorder MyEntity [keyId=23, myList=[SubEntity [name=three,
id=26], SubEntity [name=two, id=25], SubEntity [name=one, id=24]]]
reordered object: MyEntity [keyId=23, myList=[SubEntity [name=two,
id=25], SubEntity [name=one, id=24], SubEntity [name=three, id=26]]]
query
MyEntity [keyId=23, myList=[SubEntity [name=one, id=24], SubEntity
[name=two, id=25], SubEntity [name=three, id=26]]]
SubEntity [name=one, id=24]
SubEntity [name=two, id=25]
SubEntity [name=three, id=26]
-

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[appengine-java] Re: Funny behavior with memcache.increment() below zero

2010-04-06 Thread Nacho Coloma

Ok, thanks. I'm moving values to start at 10^8 instead of zero, and it
seems to work fine.

On Apr 6, 7:18 pm, Ikai L (Google) ika...@google.com wrote:
I'm looking at the standard memcached documentation:

http://github.com/memcached/memcached/blob/master/doc/protocol.txt

http://github.com/memcached/memcached/blob/master/doc/protocol.txtNote
that underflow in the decr command is caught: if a client tries

to decrease the value below 0, the new value will be 0. Overflow in
the incr command will wrap around the 64 bit mark.

When in doubt, use the solution that results in the least confusion. And
document.

On Tue, Apr 6, 2010 at 9:09 AM, Nacho Coloma icol...@gmail.com wrote:
Hi all,

I am trying to use memcache.increment to move to negative values,
starting at 0. According to the javadoc[1]:

-- Nacho

[1]

http://code.google.com/appengine/docs/java/javadoc/com/google/appengi...)

--
Ikai Lan
Developer Programs Engineer, Google App
Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine

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Re: [appengine-java] Re: Database cursor for back cursor?

2010-04-06 Thread Ikai L (Google)

Offset doesn't fetch data - it does an index scan. Going to the 10,000th
result using offset will require us to pass 10,000 results first in our
index, but we won't be retrieving those objects. Here's a bit of a
simplification of indexes, entities and how these queries work. As you know,
Bigtable is a key-value store with the ability to perform range scans.
Suppose you have a Person entity. Your entries may look like this:

Key
Value
--
APPID:Person:1 { name:
Ikai, favorite_food: donuts }
APPID:Person:2 { name:
Wesley, favorite_food: tacos }
Index:APPID:Person:favorite_food:ASC:donuts:1 [ empty ]
Index:APPID:Person:favorite_food:ASC:tacos:2 [ empty ]

*order of values in keys may not match how we actually do it, it's just to
illustrate my point
** argh, non-monospaced fonts. Sorry for the hideous table

When we look for Person entities sorted by favorite_food, we essentially ask
Bigtable to return all Keys that match:

Index:APPID:Person:favorite_food:ASC*

We get a list of Keys back and figure out keys. Using offsets, we would just
pass the first N entries per the supplied offset.

Cursors work by serializing the query position via the last index, allow us
to go straight to the index in constant time and continue the range query.

We've got a lot of content about how this works, though we probably haven't
done the best job organizing it. I'd start here:
http://code.google.com/appengine/articles/storage_breakdown.html

I've been meaning to collect all of our talks and place them into a set of
YouTube playlists. Why don't I do that right now ...

On Sat, Apr 3, 2010 at 8:16 AM, John Patterson jdpatter...@gmail.comwrote:

How many pages do your users really want to see? Even Google search sets a
limit - I think 1000 results. Although the number of results can exceed
1000 the offset is still limited so you would need to filter out results to
continue past 1K. That would be slow.

If you really need to return more than 1000 results and access them in
forward and backward directions you could sort them by __key__ or some other
unique combination and use that as you own cursor. You could define both
ascending and descending indexes on your chosen property(s) to let you
iterate in both directions.

On 3 Apr 2010, at 19:32, Arny wrote:

But isn't it getting slower and slower on higher pages, since it
fetches ALL data (according to docs) and discards the offset value?
So Range(0,10) is faster than Range(1,10) ?

Anyone did some performance tests?
Regards

On Apr 3, 7:49 am, John Patterson jdpatter...@gmail.com wrote:

Probably you should set an offset and limit instead for your paging.
I believe cursors are really intended for processing a lot of data off-
line. Remember there is no longer a 1000 result limit on fetches.

On 3 Apr 2010, at 02:57, Arny wrote:

Hi,

Is there a way to get a cursor to page back to a previous page?
If not, whats the point of paging forward only? I'm not building an
ajax page.

Regards

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Re: [appengine-java] Re: Database cursor for back cursor?

2010-04-06 Thread Ikai L (Google)

We get a list of Keys back and figure out keys.

I just realized how confusing this is - we get a list of INDEX keys back.
These don't have any value; we do all storage inside the Key. We extract the
keys of the Entity from the returned Index keys and do a query.

On Tue, Apr 6, 2010 at 11:42 AM, Ikai L (Google) ika...@google.com wrote:

Key
Value

--
APPID:Person:1 {
name: Ikai, favorite_food: donuts }
APPID:Person:2 { name:
Wesley, favorite_food: tacos }
Index:APPID:Person:favorite_food:ASC:donuts:1 [ empty ]
Index:APPID:Person:favorite_food:ASC:tacos:2 [ empty ]

*order of values in keys may not match how we actually do it, it's just to
illustrate my point
** argh, non-monospaced fonts. Sorry for the hideous table

When we look for Person entities sorted by favorite_food, we essentially
ask Bigtable to return all Keys that match:

Index:APPID:Person:favorite_food:ASC*

We get a list of Keys back and figure out keys. Using offsets, we would
just pass the first N entries per the supplied offset.

Cursors work by serializing the query position via the last index, allow us
to go straight to the index in constant time and continue the range query.

We've got a lot of content about how this works, though we probably haven't
done the best job organizing it. I'd start here:
http://code.google.com/appengine/articles/storage_breakdown.html

I've been meaning to collect all of our talks and place them into a set of
YouTube playlists. Why don't I do that right now ...

On Sat, Apr 3, 2010 at 8:16 AM, John Patterson jdpatter...@gmail.comwrote:

How many pages do your users really want to see? Even Google search sets
a limit - I think 1000 results. Although the number of results can exceed
1000 the offset is still limited so you would need to filter out results to
continue past 1K. That would be slow.

On 3 Apr 2010, at 19:32, Arny wrote:

But isn't it getting slower and slower on higher pages, since it
fetches ALL data (according to docs) and discards the offset value?
So Range(0,10) is faster than Range(1,10) ?

Anyone did some performance tests?
Regards

On Apr 3, 7:49 am, John Patterson jdpatter...@gmail.com wrote:

On 3 Apr 2010, at 02:57, Arny wrote:

Hi,

Is there a way to get a cursor to page back to a previous page?
If not, whats the point of paging forward only? I'm not building an
ajax page.

Regards

--
Ikai Lan
Developer Programs

Re: [appengine-java] is createFederatedLoginURL() working?

2010-04-06 Thread Viðar Svansson

Hi

I just noticed createFederatedLoginURL() but could not find any
documentation for it (except for JavaDoc). Is this intended for native
support for Google Marketplace? Would really appreciate some
documentation on this.

I am trying this out in 1.3.2 but get an error, The API package 'user'
or call 'CreateFederatedLoginURL()' was not found.

Viðar

On Sat, Mar 27, 2010 at 10:27 AM, dflorey daniel.flo...@gmail.com wrote:
 Hi,
 I'm trying to replace the Step2 stuff with the new
 createFederatedLoginURL(), but I just get server errors in the
 provided /_ah/ servlets.
 Are these methods supposed to work and can someone please post an
 example how to authenticate and authorize a user?
 Thanks a lot,

 Daniel

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[appengine-java] Re: URLFetch to localhost counts as out/inbound traffic?

2010-04-06 Thread Arny

Anyone did some testing whether it's increasing the in/outbound
traffic?

On Apr 5, 3:55 pm, Arny arny...@googlemail.com wrote:
 Hi,

 are the URLFetches to localhost count as in/outbound traffic?

 Regards

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[appengine-java] Re: Initialize local datastore exception

2010-04-06 Thread antcasq

I know I haven't setup properly. But I don't want to do unit testing
either.
I would like some sample configuration file or steps in order to
access the datastore outside the development server. What I have in
mind is more like a batch file/operation :)

Regards
António Casqueiro

On Apr 6, 5:00 am, Wayne Fay wayne...@gmail.com wrote:
  »»» EXCEPTION «««
  Exception in thread main java.lang.NullPointerException: No API
  environment is registered for this thread.

 This generally means you haven't set things up properly. Follow the 
 directions:http://code.google.com/appengine/docs/java/tools/localunittesting.html

 Wayne

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[appengine-java] Re: JDO Relationship Performance Problems - what am I doing wrong?

2010-04-06 Thread Matt Hall

Thanks for the response, could you point me to somewhere where I can
read about batched queries by key in JDO? Or do I need to go to the
low level API for that?

I think the conclusion I'm coming to here is 1) I shouldn't have made
the detail for each order as a separate object, (although this has
huge problems for querying later as in how many people have bought
item x), and 2) JDO managed relationships get slow with small numbers
of child objects, are hard to optimize, and probably not worth the
trouble overall. Is that pretty much what I should be concluding?

Thanks again, I'm really trying to understand how to translate what's
a basic structure in RDMS land into something that will work in app
engine beyond toy implementations.

On Apr 6, 12:54 pm, Ikai L (Google) ika...@google.com wrote:
 For speed, you'll get the most gains if you denormalize when possible - yes,
 the relational purists are going to riot, but you don't have many of the
 benefits of normalization anyway such as foreign key constraints or native
 joins.

 If that isn't an option - and I really do recommend looking into it where it
 makes sense - if you're able to retrieve keys, we may also be able to make
 use of batch queries by key.





 On Mon, Apr 5, 2010 at 2:59 PM, Matt Hall matt.h...@gmail.com wrote:
  Hi Everyone,

  I've been trying for the past while to get our relatively simple JDO
  based site to run at a reasonable speed, but I'm failing and I'd love
  any suggestions. I'll describe it as succinctly as possible to
  hopefully keep your interest :)

   * The basic structure is a User - Order - Line items type
  structure.
   * The main query performed is Orders for a user.
   * A user usually has around 10 orders, each order has under 100 line
  items.
   * The Order - Items relationship is done as a One-to-many owned
  relationship.

  My problem is that the basic request the site handles: Get all orders
  for a user and do something based on the line items is very slow. In
  real response time, my average is now 1.5 seconds, and some of the
  users are seeing 20 second response times. Clearly not ok.

  What appears to be slow, after profiling with the new app stats tool
  is that each line item is getting loaded as it's used (lazy loading),
  which works great in some cases but terrible in this case since each
  item takes 20-30ms to load.

  I have tried:

   * Moving items into the default fetch group for orders, seems to have
  no effect (may not even be possible due to limitations of joins)
   * Level 2 caching with memcache - not much effect either since only
  the individual line items are cached, not the whole List, so we still
  pay a price in round trip to the cache on each line item.
   * A sort of wacky cache that I wrote on top of the JDO managed
  relationship to cache the whole collection. This went poorly and
  resulted in odd data inconsistencies, probably because I did something
  wrong but the whole thing felt wrong.

  So my question is - what am I doing wrong? What's the best/standard
  way to represent a Master - Detail type relationship, where the total
  items for a user will be relatively small but requests need to work
  with a fair number of them.

  Thanks for any suggestions, I'd be happy to answer any questions if
  what I've written isn't clear.

  Matt

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Re: [appengine-java] elegant way of implementing sequence generator

2010-04-06 Thread Ikai L (Google)

Memcache data is never persisted to disk, so in the event of a Memcache
server restart, you will lose all the data in Memcache. In addition,
Memcache evicts items based on an LRU cache: if you don't use data for a
while and space is needed, the item will be removed from your cache to allow
for your new items. You can read more about Memcache here:

http://code.google.com/p/memcached/wiki/FAQ

On Sat, Apr 3, 2010 at 12:59 AM, aswath satrasala
aswath.satras...@gmail.com wrote:

Hello Ikai,
I am interested in Sequences, sequence starting from a initial value and
increments.
Can you little bit elaborate here on what is the risk with volatile here
when using memcache.

Regards
-Aswath

On Sat, Mar 6, 2010 at 1:05 AM, Ikai L (Google) ika...@google.com wrote:

Have you looked into Memcache's INCR?

http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheService.html#increment(java.lang.Objecthttp://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/memcache/MemcacheService.html#increment%28java.lang.Object
,
long)

This'll do it atomically, but you run the risk of it being volatile,
so you'll have to account for that in your client code.

On Tue, Mar 2, 2010 at 11:40 PM, legendlink gregc...@gmail.com wrote:
hi, i wanted to have a sequence generator that increments by x value
everytime it generates a value. if i would create the sequence
generator by using the datastore, it is likely that data contention
would occurr if there is high access times.

i have looked into the sample code of max ross in the google code
repository (SequenceExamplesJDO.java) and think this is limited to
increment by 1 only and not increment by x value.

if sharding technique is used, my concern is that i might not get the
right sequence.

what is the best/elegant way of doing sequence generator that
increments x value?

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[appengine-java] Re: JDO Relationship Performance Problems - what am I doing wrong?

2010-04-06 Thread Steve Pritchard

Before proposing a solution, what is your expected active user base.
1000's or 1,000,000s or something in between.
Steve

On Apr 6, 3:50 pm, Matt Hall matt.h...@gmail.com wrote:
 Thanks for the response, could you point me to somewhere where I can
 read about batched queries by key in JDO? Or do I need to go to the
 low level API for that?

 I think the conclusion I'm coming to here is 1) I shouldn't have made
 the detail for each order as a separate object, (although this has
 huge problems for querying later as in how many people have bought
 item x), and 2) JDO managed relationships get slow with small numbers
 of child objects, are hard to optimize, and probably not worth the
 trouble overall. Is that pretty much what I should be concluding?

 Thanks again, I'm really trying to understand how to translate what's
 a basic structure in RDMS land into something that will work in app
 engine beyond toy implementations.

 On Apr 6, 12:54 pm, Ikai L (Google) ika...@google.com wrote:

  For speed, you'll get the most gains if you denormalize when possible - yes,
  the relational purists are going to riot, but you don't have many of the
  benefits of normalization anyway such as foreign key constraints or native
  joins.

  If that isn't an option - and I really do recommend looking into it where it
  makes sense - if you're able to retrieve keys, we may also be able to make
  use of batch queries by key.

  On Mon, Apr 5, 2010 at 2:59 PM, Matt Hall matt.h...@gmail.com wrote:
   Hi Everyone,

   I've been trying for the past while to get our relatively simple JDO
   based site to run at a reasonable speed, but I'm failing and I'd love
   any suggestions. I'll describe it as succinctly as possible to
   hopefully keep your interest :)

    * The basic structure is a User - Order - Line items type
   structure.
    * The main query performed is Orders for a user.
    * A user usually has around 10 orders, each order has under 100 line
   items.
    * The Order - Items relationship is done as a One-to-many owned
   relationship.

   My problem is that the basic request the site handles: Get all orders
   for a user and do something based on the line items is very slow. In
   real response time, my average is now 1.5 seconds, and some of the
   users are seeing 20 second response times. Clearly not ok.

   What appears to be slow, after profiling with the new app stats tool
   is that each line item is getting loaded as it's used (lazy loading),
   which works great in some cases but terrible in this case since each
   item takes 20-30ms to load.

   I have tried:

    * Moving items into the default fetch group for orders, seems to have
   no effect (may not even be possible due to limitations of joins)
    * Level 2 caching with memcache - not much effect either since only
   the individual line items are cached, not the whole List, so we still
   pay a price in round trip to the cache on each line item.
    * A sort of wacky cache that I wrote on top of the JDO managed
   relationship to cache the whole collection. This went poorly and
   resulted in odd data inconsistencies, probably because I did something
   wrong but the whole thing felt wrong.

   So my question is - what am I doing wrong? What's the best/standard
   way to represent a Master - Detail type relationship, where the total
   items for a user will be relatively small but requests need to work
   with a fair number of them.

   Thanks for any suggestions, I'd be happy to answer any questions if
   what I've written isn't clear.

   Matt

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  Developer Programs Engineer, Google App 
  Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine

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Re: [appengine-java] Blogger API

2010-04-06 Thread Ikai L (Google)

You'll want to read the GData docs here:

http://code.google.com/apis/blogger/docs/2.0/developers_guide.html

Here are the Java specific docs:

http://code.google.com/apis/blogger/docs/2.0/developers_guide_java.html

On Mon, Apr 5, 2010 at 3:04 AM, Jeevan jeevan.don...@gmail.com wrote:

 hello am developing an application which is to be hosted on app
 engine,i wanna make use of blogger api, i am not able to run the
 blogger data api,am not able to understand how do i make use of the
 same

 please help me...

 thanks

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Re: [appengine-java] appcfg.sh update keeping asking for email/password

2010-04-06 Thread Ikai L (Google)

Are you still having this issue? Does it give you an error trace?

On Sun, Apr 4, 2010 at 1:17 PM, Bendanpa benda...@gmail.com wrote:

 I am very sure that I gave correct email/password. Anybody have the
 same issue?

 Thanks,
 Bendanpa

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[appengine-java] Re: Trying a clean compile gives The parameter is incorrect

2010-04-06 Thread John V Denley

Thanks to the guys on the GWT forum for helping me solve this problem.
It did turn out to be a classpath problem and there follows an
explanation of the steps I took to discover the issue and how I solved
it:

To find out the classpath used:
In Eclipse select Debug view by going to Window|Open
Perspective|Debug and then select the debug window by going to
Window|Show View|Debug then right click the last item in the list
shown and select properties

I found that my appengine SDK path was being references about 21 times
as:
C:\Program Files\eclipse\plugins
\com.google.appengine.eclipse.sdkbundle.
1.3.2_1.3.2.v201003241245\appengine-java-sdk-1.3.2

so I copied it to C:\appengine-java-sdk-1.3.2

And then linked to it by doing the following:

In Eclipse select the Java view by going to Window|Open Perspective|
Java and then select the project properties by going to Project|
Properties then select Google|App Engine and click on Configure
SDK's then click Add on the right hand side and select the path you
just created eg C:\appengine-java-sdk-1.3.2 and add a Display Name
eg Short App Engine SDK. Click OK as needed to close all the
windows, and everything should start working again!!!

Good Luck,
John


On Apr 5, 5:20 pm, John V Denley johnvden...@googlemail.com wrote:
 Im on the train now... hoping my connection holds up, but just incase
 it helps, I have now rolled back to a version of the code that I
 comiled and deployed successfully last night, and Im still getting
 this error, so something else has changed, and its not me thats
 changed it... this must be something that Eclipse or Java compiler is
 picking up from somewhere else!.

 On Apr 5, 3:54 pm, John V Denley johnvden...@googlemail.com wrote:

  What is this message telling me?

  'DataNucleus Enhancer' has encountered a problem

  Cannot run program C:\Program Files\Java\jre6\bin\javaw.exe (in
  directory C:\Documents and Settings\John\My Documents\_DeBa\ideba
  \iDeBanet): CreateProcess error=87, The parameter is incorrect
  Cannot run program C:\Program Files\Java\jre6\bin\javaw.exe (in
  directory C:\Documents and Settings\John\My Documents\_DeBa\ideba
  \iDeBanet): CreateProcess error=87, The parameter is incorrect

  I cant seem to find anything helpful anywhere on the web, all I can
  find is suggestions that my classpath is too long for windows, but I
  dont know where to figure out what my classpath length is, plus its
  not THAT big a project, so im surprised ive hit any kind of limit,
  although I HAVE just included one additional *.java file in my client
  directory, but I have tried taking that out and recompiling clean, and
  its still happening!

  Is this aGWTproblem? or an Eclipse problem or a Java problem?

  Any pointers would be really helpful, as i have a deadline for
  tomorrow, the code is all done, I just cant seem to deploy it!

  Thanks,
  John
  PS Im posting this on theGWTgrouptoo, as I have to catch a train
  now, and will be back later to see if anyone has replied!

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Re: [appengine-java] JPA: Query contains stale data (bug or future)?

2010-04-06 Thread Ikai L (Google)

It looks like you are changing the elements of the List themselves and not
the List. You'll have to mark the object as dirty:

https://groups.google.com/group/google-appengine-java/browse_thread/thread/152cdafdded18611?pli=1auth=DQAAALsysGgvSS7DADt9mTLjZVIfRcR3Ia0xnDJnZbMuAemwe776lEU-XNeYHi4XHpY5Bifg1xWbsctkBvQx5zML0axYXo2NlqltSM4p3KzBugUeNMAkhXyhYebPm0lQcCpCpuEMiZJ5JGfnPurgwrr9v8ED7wmeYMVS1mNUkJlDtsjLTiBUckaN4zVpHE9A954YDaNF86Ph7tzt99WvOJSlKPpB5IElWR-LPXslY-8v_KJTBvSm2gqRVhib-1IBIh9QxBo

https://groups.google.com/group/google-appengine-java/browse_thread/thread/152cdafdded18611?pli=1auth=DQAAALsysGgvSS7DADt9mTLjZVIfRcR3Ia0xnDJnZbMuAemwe776lEU-XNeYHi4XHpY5Bifg1xWbsctkBvQx5zML0axYXo2NlqltSM4p3KzBugUeNMAkhXyhYebPm0lQcCpCpuEMiZJ5JGfnPurgwrr9v8ED7wmeYMVS1mNUkJlDtsjLTiBUckaN4zVpHE9A954YDaNF86Ph7tzt99WvOJSlKPpB5IElWR-LPXslY-8v_KJTBvSm2gqRVhib-1IBIh9QxBoI'm
not completely sure this is what's going on here, as I just did a quick read
through of your code. Can you give this a try?

On Fri, Mar 26, 2010 at 11:47 PM, danblack firewor...@gmail.com wrote:

 Hello.
 I'm using JPA support for managing the App Engine datastore.
 And I've got some problems.

 I've got an entity Container than contains entities Item(s).
 Here is my actions.
 I starts transaction then updates entity then flush updates to
 database.
 Than I gets all entities Item(s) for a container which contains my
 updated Item.
 But the list of retrieved items contains Item that does not have my
 changes.
 What is wrong with my code???


 I've modelled this problem. (see code)

 @Entity
 public class Container implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;

@OneToMany(mappedBy = container, fetch = FetchType.LAZY)
private ListItem items = new ArrayListItem();

public void setKey(Key key) {
this.key = key;
}

public Key getKey() {
return key;
}

public void setItems(ListItem items) {
this.items = items;
}

public ListItem getItems() {
return items;
}

 }

 @Entity
 public class Item implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Key key;

@ManyToOne(fetch = FetchType.LAZY)
private Container container;

@Column
private String value;

public void setKey(Key key) {
this.key = key;
}

public Key getKey() {
return key;
}

public void setContainer(Container container) {
this.container = container;
}

public Container getContainer() {
return container;
}

public void setValue(String value) {
this.value = value;
}

public String getValue() {
return value;
}

@Override
public String toString() {
return Item [key= + key + , value= + value + ];
}
 }

 @Service(TestLocalService)
 public class LocalService {

protected final Log logger = LogFactory.getLog(getClass());

@Autowired
@Qualifier(jpaTemplate)
protected JpaTemplate jpaTemplate;

@Transactional(propagation = Propagation.REQUIRED)
public Key createContainer() {
Container container = new Container();
jpaTemplate.persist(container);
jpaTemplate.flush();
logger.fatal(new container + container.getKey());
return container.getKey();
}

@Transactional(propagation = Propagation.REQUIRED)
public Key generateItems(Key containerKey) {
Container container = jpaTemplate.find(Container.class,
 containerKey);
Key key = null;
for (int i = 0; i  5; i++) {
Item item = new Item();
item.setContainer(container);
item.setValue(Integer.toString(i));
jpaTemplate.persist(item);
jpaTemplate.flush();
key = item.getKey();
logger.fatal(new item + item);
}
return key;
}

@Transactional(propagation = Propagation.REQUIRED)
public void changeItems(Key containerKey, Key itemKey) {
Container container = jpaTemplate.find(Container.class,
 containerKey);
Item changedItem = jpaTemplate.find(Item.class, itemKey);
changedItem.setValue(xxx); //
 ---
 PROBLEM HERE
jpaTemplate.flush();
logger.fatal(changed item:  + changedItem);

Re: [appengine-java] Re: JDO Relationship Performance Problems - what am I doing wrong?

2010-04-06 Thread Jeff Schnitzer

The most important number in my mind is the number of line items in an
order.  If you're seeing 20s+ queries, it must be a pretty large
number.

Objectify (and Twig) support queryable collections of embedded
objects, so you can put all the line items in a single order object.
There are some practical limits to this approach, though - the
collection can have at most 5k items and the total entity size cannot
exceed 1MB.  Also, writing out indexed collections with 5,000 entries
is *very* expensive in terms of $, so if you have a high churn rate
you'll burn through your budget pretty fast.

Obviously serialization is an option, but then you won't be able to
query for orders by line item data.

If it makes the most sense to keep the line items as separate objects
(because of churn or simple volume of line items) you can still use
the memcache to your advantage.  You'll want a bidirectional
relationship, with Keys stored in the Order pointing to the LineItems
as well as vice-versa.  You can load an Order and use the LineItem
keys to perform a batch get, hopefully most of which will come out of
the memcache.

It's hard to suggest a strategy without knowing the shape of the data,
the query expected profile, and the churn rate.

Jeff

On Tue, Apr 6, 2010 at 2:23 PM, Steve Pritchard steve...@gmail.com wrote:
 Before proposing a solution, what is your expected active user base.
 1000's or 1,000,000s or something in between.
 Steve

 On Apr 6, 3:50 pm, Matt Hall matt.h...@gmail.com wrote:
 Thanks for the response, could you point me to somewhere where I can
 read about batched queries by key in JDO? Or do I need to go to the
 low level API for that?

 I think the conclusion I'm coming to here is 1) I shouldn't have made
 the detail for each order as a separate object, (although this has
 huge problems for querying later as in how many people have bought
 item x), and 2) JDO managed relationships get slow with small numbers
 of child objects, are hard to optimize, and probably not worth the
 trouble overall. Is that pretty much what I should be concluding?

 Thanks again, I'm really trying to understand how to translate what's
 a basic structure in RDMS land into something that will work in app
 engine beyond toy implementations.

 On Apr 6, 12:54 pm, Ikai L (Google) ika...@google.com wrote:

  For speed, you'll get the most gains if you denormalize when possible - 
  yes,
  the relational purists are going to riot, but you don't have many of the
  benefits of normalization anyway such as foreign key constraints or native
  joins.

  If that isn't an option - and I really do recommend looking into it where 
  it
  makes sense - if you're able to retrieve keys, we may also be able to make
  use of batch queries by key.

  On Mon, Apr 5, 2010 at 2:59 PM, Matt Hall matt.h...@gmail.com wrote:
   Hi Everyone,

   I've been trying for the past while to get our relatively simple JDO
   based site to run at a reasonable speed, but I'm failing and I'd love
   any suggestions. I'll describe it as succinctly as possible to
   hopefully keep your interest :)

    * The basic structure is a User - Order - Line items type
   structure.
    * The main query performed is Orders for a user.
    * A user usually has around 10 orders, each order has under 100 line
   items.
    * The Order - Items relationship is done as a One-to-many owned
   relationship.

   My problem is that the basic request the site handles: Get all orders
   for a user and do something based on the line items is very slow. In
   real response time, my average is now 1.5 seconds, and some of the
   users are seeing 20 second response times. Clearly not ok.

   What appears to be slow, after profiling with the new app stats tool
   is that each line item is getting loaded as it's used (lazy loading),
   which works great in some cases but terrible in this case since each
   item takes 20-30ms to load.

   I have tried:

    * Moving items into the default fetch group for orders, seems to have
   no effect (may not even be possible due to limitations of joins)
    * Level 2 caching with memcache - not much effect either since only
   the individual line items are cached, not the whole List, so we still
   pay a price in round trip to the cache on each line item.
    * A sort of wacky cache that I wrote on top of the JDO managed
   relationship to cache the whole collection. This went poorly and
   resulted in odd data inconsistencies, probably because I did something
   wrong but the whole thing felt wrong.

   So my question is - what am I doing wrong? What's the best/standard
   way to represent a Master - Detail type relationship, where the total
   items for a user will be relatively small but requests need to work
   with a fair number of them.

   Thanks for any suggestions, I'd be happy to answer any questions if
   what I've written isn't clear.

   Matt

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   Google App Engine

[appengine-java] A catch-all servlet?

2010-04-06 Thread Mark

Hi,

I'm using GWT and GAE. I want to serve my project's one and only jsp
file no matter what url is entered by the user in their browser. So
the web.xml file looks like this:

  welcome-file-list
welcome-fileUserMaps.jsp/welcome-file
  /welcome-file-list

  servlet
servlet-nameindexpage/servlet-name
jsp-fileUserMaps.jsp/jsp-file
  /servlet
  servlet-mapping
servlet-nameindexpage/servlet-name
url-pattern/*/url-pattern
  /servlet-mapping

when I run this locally, it works fine. Any of the following urls
serve my gwt app with UserMaps.jsp:

  http://localhost:/
  http://localhost:/JohnDoe
  http://localhost:/JaneDoe

when I publish to GAE, it stops working, none of the urls can find
UserMaps.jsp:

  http://usermaps.appspot.com/
  http://usermaps.appspot.com/JohnDoe/
  http://usermaps.appspot.com/JaneDoe/

I'm not sure if this should work, I'm looking at the reference here:

  
http://code.google.com/appengine/docs/java/config/webxml.html#The_Welcome_File_List

My real goal is to support a twitter-like url mapping scheme where a
user can enter my domain/username, and I'll show them their customized
user page (by pulling some info out of the data store and dynamically
rendering a page for them),

Thanks

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