date:20090904


Well, my primary servlet that loads data from the datastore still
breaks, and spits out a 500 Server Error when I run it manually:

http://showsort.appspot.com/showsort/list

If it works, it shouldn't show anything at all, because it is a GWT-
RPC driven servlet.

http://showsort.appspot.com

There are 2 things which have async calls run. First is a graphic
update which draws a black line (IE still doesn't work for this...
other browsers do though). Second is a list of sorting algorithms,
retrieved from the datastore, which appears above the Start button on
the screen. This never happens, because I'm getting a 500 Server Error
consistently whenever it attempts to be run.

I've re-uploaded my app on the off chance that it was a bad update or
something last time, and no change. It makes my app, well, completely
useless if I can't access the datastore at all...

On Sep 4, 7:25 am, sandlex aspes...@gmail.com wrote:
 I played with my application today and there was no any problems with 
 datastore.

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[appengine-java] Re: XMPP send Chinese message garbled?

2009-09-04 Thread Michael Davidson


Hi Terry -

There is a slight problem in the implementation of parseMessage(). It
currently doesn't pay attention to the encoding of the elements in the
POST, assuming they are UTF-16. In fact, the POST comes in encoded in
UTF-8. If you modify the code in parseMessage to assume UTF-8, your
example should work. This will be fixed in 1.2.6.

Michael

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[appengine-java] Re: Datastore problems!

We're unaware of any datastore problems. One thing you might try is
upgrading to the latest version of the SDK (don't forget to copy all of the
updated datastore libraries into your WEB-INF/lib). If that doesn't work for
you, please post a full stacktrace and your application id.

On Fri, Sep 4, 2009 at 9:09 AM, Andrew adys...@gmail.com wrote:


 Hey,
 Im getting java.lang.ArrayIndexOutOfBoundsException when trying to
 retrieve from the datastore! The status page says that things are
 supposed to be ok now (after the issues), but they arent for me!! Is
 it just a case of taking time before everything is ok or?
 


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[appengine-java] Re: Maven

2009-09-04 Thread Nikolay Gorylenko


please include 1.2.5 jars to 
http://www.mvnsearch.org/maven2/com/google/appengine/
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[appengine-java] Re: GAE down? Response Error 500


Application ID is showsort.

I can't provide stacktraces for the error, because I'm getting no
stacktraces. It isn't even showing up in the logs as a problem. I'm
seeing a 500 error, where there used to not be a 500 error. I've not
modified the code for my list servlet in several days, but this is now
not working, and hasn't been since yesterday, and it appears to be the
same problem it had a couple days ago during the short window.

On Sep 4, 8:31 am, Toby Reyelts to...@google.com wrote:
 Cliff,
 We're not aware of any datastore problems. As Matthew posted two days ago,
 there was a short window where changes were introduced that may have caused
 some problems for some applications, so we rolled them back in short order.
 If after further investigation you still believe these are App Engine
 problems, please provide us with more information such as stacktraces and
 your application id. You can always check our status
 sitehttp://code.google.com/status/appengine/to see if it appears
 that App Engine is having problems in general.

 On Fri, Sep 4, 2009 at 10:21 AM, Cliff Hill ch...@darkhelm.org wrote:
  Still unable to do datastore gets. Well, for about 3 hours yesterday, it
  worked, and then it stopped. And it is still stopped as of this morning. Any
  chance that I'll be able to use my datastore code sometime in the near
  future? My app really kinda relies on the datastore to, well, work.

  On Thu, Sep 3, 2009 at 5:34 AM, Traveler1980 jshar...@gmail.com wrote:

  Datastore GET error rate is still 100%.  Any ETA on when this will be
  resolved?

  Regards,
  JS

  On Sep 3, 3:41 am, Hani Naguib haninag...@gmail.com wrote:
   I am also getting many error 500 pages.
   This is happening since the issue I mentioned here:
 http://groups.google.com/group/google-appengine-java/browse_thread/th...

  --
  I'm not responcabel fer my computer's spleling errnors - Xlorep DarkHelm
  Website:http://darkhelm.org
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[appengine-java] Re: JasperReports on GAE

2009-09-04 Thread bgood


Sure would be nice if appengine would decide to support awt - it would
solve this problem and many others. (Vote for it here
http://code.google.com/p/googleappengine/issues/detail?id=1423).
However, my impression is that they have no intention to do so any
time soon - it must cause some significant problems for their
infrastructure.

Someone apparently got iText to run in app-engine
http://groups.google.com/group/google-appengine-java/msg/419faf63fff47ef7

and there was an issue posted to itext on sourceforge, but I can't
seem to access the itext project there anymore - perhaps they moved?
https://sourceforge.net/tracker/?func=detailaid=2810312group_id=152



On Sep 4, 1:33 am, Grzegorz Borkowski grzegorz...@gmail.com wrote:
 Do you know if JasperReports developers are aware of this problem? Is
 there any bug reported to them? I haven't found any on myself.
 Logically, JasperReports (nor iText) shouldn't depend on AWT classes,
 so this dependency is a bit strange, and perhaps can be fixed by them.

 On Sep 4, 12:16 am, bgood ben.mcgee.g...@gmail.com wrote:



  We had the same problem but ended up hosting the report generator on a
  separate server.  If you figure it out, please post here about how to
  do it!  Its really the only critical piece of our code that we can't
  move into this particular cloud.  Its the only reason we are
  considering alternative hosting services right now.
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[appengine-java] this group is being copied on a blog

2009-09-04 Thread bgood


I don't know what the owners of the group think about this, but it
seems wrong to me.  All of the messages posted to this list are
appearing on this guys blog unmodified.  See

http://cng1985.blogspot.com/2009/09/appengine-java-re-jasperreports-on-gae_04.html

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[appengine-java] Queries in 1.2.5 don't retrieve com.google.appengine.api.datastore.Text data anymore?

2009-09-04 Thread Dominik Steiner


Hi,

I have data objects stored in the datastore that have a propery of
type com.google.appengine.api.datastore.Text. In 1.2.2 this was
working without problems and querying the data objects would also
retrieve the property with type
com.google.appengine.api.datastore.Text, but moving to 1.2.5 this
doesn't work anymore and the property of type
com.google.appengine.api.datastore.Text is returning always as null.
This problem also occurs for property of type Blob.

Anybody has a clue if this is a bug or a feature?

Thanks.

Dominik
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[appengine-java] Re: GAE down? Response Error 500

2009-09-04 Thread Arod


My app id is mindhackme.  My app has not run for approx a week now and
it died without me even updating it. I searched online about possible
causes and one post I read determined that the persistenceManager bean
that the Grails GAE plugin used was not a singleton and that was
creating problems.  So I changed my code to use the persistence the
way the google docs suggest but still no luck.  Here is a stack trace
from this morning. The app is a blog that is built on grails. I'm
using the gae plugin for grails and things were working smoothly until
recent changes to gae:

#

   1.
  09-04 09:14AM 39.601 / 500 30005ms 33600cpu_ms 0kb Mozilla/5.0
(Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/
3.5.2 (.NET CLR 3.5.30729),gzip(gfe)
  See details

  65.200.50.194 - - [04/Sep/2009:09:15:09 -0700] GET / HTTP/1.1
500 0 - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2)
Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729),gzip(gfe)
mindhackme.appspot.com

   2.
  W 09-04 09:14AM 46.707

  [mindhackme/6.336061699959790088].stderr: log4j:ERROR Error
initializing log4j: java.io.FileOutputStream is a restricted class.
Please see the Google App Engine developer's guide for more details.


   3.
  I 09-04 09:14AM 46.759

  javax.servlet.ServletContext log: Initializing Spring root
WebApplicationContext

   4.
  W 09-04 09:15AM 09.129

  [mindhackme/6.336061699959790088].stderr: log4j:WARN No
appenders could be found for logger (StackTrace).


   5.
  W 09-04 09:15AM 09.129

  [mindhackme/6.336061699959790088].stderr: log4j:WARN Please
initialize the log4j system properly.


   6.
  W 09-04 09:15AM 09.543

  failed urlMapping
  com.google.apphosting.runtime.HardDeadlineExceededError: This
request (e89c1f3832ff258e) started at 2009/09/04 16:14:40.632 UTC and
was still executing at 2009/09/04 16:15:09.509 UTC.
at
org.springframework.beans.PropertyMatches.calculateStringDistance
(PropertyMatches.java:153)
at org.springframework.beans.PropertyMatches.calculateMatches
(PropertyMatches.java:136)
at org.springframework.beans.PropertyMatches.init
(PropertyMatches.java:81)
at org.springframework.beans.PropertyMatches.forProperty
(PropertyMatches.java:63)
at org.springframework.beans.PropertyMatches.forProperty
(PropertyMatches.java:53)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue
(BeanWrapperImpl.java:800)
at org.springframework.beans.BeanWrapperImpl.setPropertyValue
(BeanWrapperImpl.java:651)
at
org.springframework.beans.AbstractPropertyAccessor.setPropertyValues
(AbstractPropertyAccessor.java:78)
at
org.springframework.beans.AbstractPropertyAccessor.setPropertyValues
(AbstractPropertyAccessor.java:63)
at org.springframework.web.filter.GenericFilterBean.init
(GenericFilterBean.java:169)
at
org.springframework.web.filter.DelegatingFilterProxy.initDelegate
(DelegatingFilterProxy.java:218)
at
org.springframework.web.filter.DelegatingFilterProxy.initFilterBean
(DelegatingFilterProxy.java:145)
at org.springframework.web.filter.GenericFilterBean.init
(GenericFilterBean.java:179)
at org.mortbay.jetty.servlet.FilterHolder.doStart
(FilterHolder.java:99)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at org.mortbay.jetty.servlet.ServletHandler.initialize
(ServletHandler.java:589)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:
139)
at org.mortbay.jetty.webapp.WebAppContext.startContext
(WebAppContext.java:1218)
at org.mortbay.jetty.handler.ContextHandler.doStart
(ContextHandler.java:500)
at org.mortbay.jetty.webapp.WebAppContext.doStart
(WebAppContext.java:448)
at org.mortbay.component.AbstractLifeCycle.start
(AbstractLifeCycle.java:40)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.createHandler
(AppVersionHandlerMap.java:190)
at
com.google.apphosting.runtime.jetty.AppVersionHandlerMap.getHandler
(AppVersionHandlerMap.java:167)
at
com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest
(JettyServletEngineAdapter.java:127)
at com.google.apphosting.runtime.JavaRuntime.handleRequest
(JavaRuntime.java:235)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4950)
at com.google.apphosting.base.RuntimePb$EvaluationRuntime
$6.handleBlockingRequest(RuntimePb.java:4948)
at
com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest
(BlockingApplicationHandler.java:24)
at com.google.net.rpc.impl.RpcUtil.runRpcInApplication
(RpcUtil.java:359)
at com.google.net.rpc.impl.Server$2.run(Server.java:823)
at com.google.tracing.LocalTraceSpanRunnable.run
(LocalTraceSpanRunnable.java:56)
at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan

[appengine-java] Re: Queries in 1.2.5 don't retrieve com.google.appengine.api.datastore.Text data anymore?

2009-09-04 Thread rick


Did you change your code ?
Text and Blod are not part of the default fetch group.  Look at
http://www.datanucleus.org/products/accessplatform/jdo/fetchgroup.html
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[appengine-java] Re: Queries in 1.2.5 don't retrieve com.google.appengine.api.datastore.Text data anymore?

2009-09-04 Thread Dominik Steiner

Hi rick,

thank you very much for the fast answer, this was very helpful.

I didn't change my code, as i could switch locally in eclipse from GA  
1.2.2 to 1.2.5 without doing any code changes and in 1.2.2 it would  
retrieve the properties of type text or blob, in 1.2.5 it wouldn't.

Thanks to your link the solution was then to add

@Persistent(defaultFetchGroup=true)

to the fields with text or blob.

For me this is still a breaking change from 1.2.2 to 1.2.5, I think  
this should be clearly documented.

Thanks again for your post.

Dominik


 Did you change your code ?
 Text and Blod are not part of the default fetch group.  Look at
 http://www.datanucleus.org/products/accessplatform/jdo/fetchgroup.html
 


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[appengine-java] Re: Confirmation of Google Multi-Tenant app policy

Currently, registering multiple IDs for the same application is a violation
of the App Engine terms of service. However, we do have an exception policy
in place for developers with a multi-tenant strategy, and we handle these on
a case-by-case basis. To begin, please file a new multi-instance exception
request:

http://code.google.com/support/bin/request.py?contact_type=AppEngineMultiInstanceExceptionRequest

- Jason

On Wed, Sep 2, 2009 at 5:33 AM, doc123 doc.u...@gmail.com wrote:

Now I am planning to start free project management service =
http://www.chainofasker.com/ by using Google App Engine

When I try to provide this free project management service, problem is
server fee because once I release this service, I can not expect how
many user come to this site and use free service.

So I want to ask user to have their dedicated server if they want use
stable service. Procedure is following

User create User own account at Google app engine site.
User nominate me as a administrator or invite me as a developer.
I install server software.
User remove me from administrator list.
User start using my service

Is this meet Google App Engine’s terms of use?

I found related article which is posted by Jason but now I can not
find it url so I post previous multi-tenant discussion image to here
= http://www.chainofasker.com/muti-tenant-past-post

I think above procedure is keeping Jason’s recommendation.

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[appengine-java] Re: Inconsistence between how app-engine sorts string encoded-keys and java method String.compareTo()

Yes, encoded String keys are designed to be opaque. But it is possible to
compare two Key objects directly:
http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Key.html#compareTo%28com.google.appengine.api.datastore.Key%29

- Jason

On Tue, Sep 1, 2009 at 11:38 PM, Corneliu Paul Lupulet 
corneliu.lupu...@gmail.com wrote:

 I think I may have found the answer. Even though an encoded key is a
 string, I should use KeyFactory.stringToKey(encodedKeyString) to compare two
 key strings.




 On Tue, Sep 1, 2009 at 7:18 PM, Cornel corneliu.lupu...@gmail.com wrote:

 Hello!

 I ran over this problem. I was retrieving a DbContact data set
 simply ordered by
 encodedKey ascending, and i got this list:

 [(key agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYm0gMCxIJRGJDb250YWN0GJxIDA
 name EUROTRIM)
 , (key agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYnUgMCxIJRGJDb250YWN0GJ5IDA
 name ANCA ELECTRIC SYSTEMS)
 , (key agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYn0gMCxIJRGJDb250YWN0GKBIDA
 name TWIN TRADING)
 ...

 So, apparently
 agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYnUgMCxIJRGJDb250YWN0GJ5IDA 
 agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYn0gMCxIJRGJDb250YWN0GKBIDA (the
 second and the third entries in the above list)

 But
 agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYnUgMCxIJRGJDb250YWN0GJ5IDA.compareTo
 (agljb3NpbnV4NjhyIQsSCkRiQ3VzdG9tZXIYn0gMCxIJRGJDb250YWN0GKBIDA) =
 37  0, which is opposite!

 The encodedKey field is defined in the DbContact class as:

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 public class DbContact extends DbEntity {

@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName=datanucleus, key=gae.encoded-pk,
 value=true)
private String encodedKey;

 @Persistent
private DbCustomer customer;
 ...

 Also, i have a DbCustomer class which is the parent of a DbContact
 class, defined as:

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 public class DbCustomer extends DbEntity {

@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
@Extension(vendorName=datanucleus, key=gae.encoded-
 pk,value=true)
private String encodedKey;

@Persistent(mappedBy = customer)
@Order(extensions = @Extension(vendorName=datanucleus,
key=list-ordering, value=customerProfile desc))
private ListDbContact contacts;
 ..

 So what's with this inconsistence? Have any ideas?




 --
 Corneliu Paul Lupulet




 


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[appengine-java] Re: xmpp support

XMPP support was added in the 1.2.5 release announced yesterday:
http://code.google.com/appengine/docs/java/xmpp/

- Jason

On Wed, Sep 2, 2009 at 1:47 AM, asianCoolz second.co...@gmail.com wrote:


 May i know when GAE mentioned will support XMPP for next version of
 GAE, does that mean, it will support all features of xmpp?  can we
 use BOSH to replace comet feature? the reason i asking is because
 i'm very interested to use comet in my application but found out GAE
 doesn't support it. So, I am wondering should i invest my time create
 'xmpp/bosh' feature on my app and anticipating for next version of
 GAE? what is the estimate date of the next release?
 


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[appengine-java] Re: OpenID Consumer

I haven't used any myself, but this page has a list of relevant Java
libraries:
http://wiki.openid.net/Libraries

Also, the OpenSocial client library for Java, which is compatible with App
Engine, uses the open source OAuth library available at
http://code.google.com/p/oauth for request signing and validation.

- Jason

On Wed, Sep 2, 2009 at 5:10 PM, anjolight anjoli...@gmail.com wrote:


 Hi, I'm trying to create an OpenID consumer in my appengine project.
 My intention to use Google for OpenID provider with OpenID+OAuth. If
 someone has an example code to share, I'd greatly appreciate it.

 thank you.
 


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[appengine-java] Re: GAE down? Response Error 500


I just re-uploaded my app, with logging enabled for my servlet again,
so I can see the progress it has when/if it runs. However I'm seeing
that someone has been testing other things as well... I'm also seeing
a 500 Server Error on the main app now.

On Sep 4, 8:42 am, Xlorep DarkHelm ch...@darkhelm.org wrote:
 Application ID is showsort.

 I can't provide stacktraces for the error, because I'm getting no
 stacktraces. It isn't even showing up in the logs as a problem. I'm
 seeing a 500 error, where there used to not be a 500 error. I've not
 modified the code for my list servlet in several days, but this is now
 not working, and hasn't been since yesterday, and it appears to be the
 same problem it had a couple days ago during the short window.

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[appengine-java] Re: Problem while using Gilead for Hibernate and Gwt

I'll need to see a snippet of your server-side code that's failing to get a
better understanding of the error's cause. But if you're trying to use
Hibernate/MySQL directly, this could be the issue since Hibernate is not
supported:
http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine

App Engine has its own datastore for persisting objects and provides a JDO
and JPA interface to this datastore:

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

- Jason

On Wed, Sep 2, 2009 at 12:08 AM, Rajitha rajitha.redd...@gmail.com wrote:


 Hi All,
 Im currently working on Sim Applications using Hibernate,Gwt,mysql  in
 eclipse 3.4.im using Gilead for this.

 When im running my Application im getting following errors:



 SEVERE: [125187460050] javax.servlet.ServletContext log: Exception
 while dispatching incoming RPC call
 java.lang.NoSuchMethodError:
 net.sf.beanlib.spi.BeanTransformerSpi.initCustomTransformerFactory
 (Lnet/sf/beanlib/spi/CustomBeanTransformerSpi$Factory;)Lnet/sf/beanlib/
 spi/BeanTransformerSpi;
at
 net.sf.gilead.core.beanlib.merge.MergeBeanPopulator.newBeanPopulator
 (MergeBeanPopulator.java:51)
at net.sf.gilead.core.LazyKiller.populate(LazyKiller.java:249)
at net.sf.gilead.core.LazyKiller.attach(LazyKiller.java:216)
at net.sf.gilead.core.PersistentBeanManager.mergePojo
 (PersistentBeanManager.java:517)
at net.sf.gilead.core.PersistentBeanManager.merge
 (PersistentBeanManager.java:305)
at net.sf.gilead.gwt.GileadRPCHelper.parseInputParameters
 (GileadRPCHelper.java:95)
at net.sf.gilead.gwt.PersistentRemoteService.processCall
 (PersistentRemoteService.java:147)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.doPost
 (RemoteServiceServlet.java:86)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at
 org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
 487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
 (ServletHandler.java:1093)
at
 com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter
 (TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter
 (ServletHandler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle
 (ServletHandler.java:360)
at org.mortbay.jetty.security.SecurityHandler.handle
 (SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle
 (SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle
 (ContextHandler.java:712)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
 405)
at
 com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle
 (DevAppEngineWebAppContext.java:54)
at org.mortbay.jetty.handler.HandlerWrapper.handle
 (HandlerWrapper.java:139)
at com.google.appengine.tools.development.JettyContainerService
 $ApiProxyHandler.handle(JettyContainerService.java:306)
at org.mortbay.jetty.handler.HandlerWrapper.handle
 (HandlerWrapper.java:139)
at org.mortbay.jetty.Server.handle(Server.java:313)
at
 org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
 506)
at org.mortbay.jetty.HttpConnection$RequestHandler.content
 (HttpConnection.java:844)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
at org.mortbay.io.nio.SelectChannelEndPoint.run
 (SelectChannelEndPoint.java:396)
at org.mortbay.thread.BoundedThreadPool$PoolThread.run
 (BoundedThreadPool.java:442)

 com.google.gwt.user.client.rpc.StatusCodeException: The call failed on
 the server; see server log for details






 Anyone can please help me..

 Thanks in advance

 


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[appengine-java] Re: self join in google app engine

Hi Midhat. In the thread that leszek links to, I discuss this bug in a
little more detail -- it seems you can't persist objects having an owned
one-to-many relationship with objects of the same kind. Owned one-to-one
relationships seem to work, however. As a workaround, you can use an unowned
relationship (i.e. SetKey children) or specify a new class for the child
objects.
- Jason

On Wed, Sep 2, 2009 at 1:57 AM, leszek leszek.ptokar...@gmail.com wrote:


 Read this thread - could be helpfull :


 http://groups.google.co.uk/group/google-appengine-java/browse_frm/thread/3affdf1441f864b6/99a166946ad0ef61?lnk=gstq=self#99a166946ad0ef61


 


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[appengine-java] Re: GAE down? Response Error 500

I can't see that any RPCs are ever made from your client application to the
server. How are you testing http://showsort.appspot.com/showsort/list ? You
can't follow that directly from a browser (i.e. put it in your address bar),
because GWT RPC does not support HTTP GET requests - it will give you some
error code back like a 400 or a 500.

Can you reproduce any of this on the local dev_appserver? If so, then you
can use a debugger to track down the problem. If not, then you should add
some code to your GWT client to track down why it appears the RPC is not
being initiated.

On Fri, Sep 4, 2009 at 11:42 AM, Xlorep DarkHelm ch...@darkhelm.org wrote:


 Application ID is showsort.

 I can't provide stacktraces for the error, because I'm getting no
 stacktraces. It isn't even showing up in the logs as a problem. I'm
 seeing a 500 error, where there used to not be a 500 error. I've not
 modified the code for my list servlet in several days, but this is now
 not working, and hasn't been since yesterday, and it appears to be the
 same problem it had a couple days ago during the short window.

 On Sep 4, 8:31 am, Toby Reyelts to...@google.com wrote:
  Cliff,
  We're not aware of any datastore problems. As Matthew posted two days
 ago,
  there was a short window where changes were introduced that may have
 caused
  some problems for some applications, so we rolled them back in short
 order.
  If after further investigation you still believe these are App Engine
  problems, please provide us with more information such as stacktraces and
  your application id. You can always check our status
  sitehttp://code.google.com/status/appengine/to see if it appears
  that App Engine is having problems in general.
 
  On Fri, Sep 4, 2009 at 10:21 AM, Cliff Hill ch...@darkhelm.org wrote:
   Still unable to do datastore gets. Well, for about 3 hours yesterday,
 it
   worked, and then it stopped. And it is still stopped as of this
 morning. Any
   chance that I'll be able to use my datastore code sometime in the near
   future? My app really kinda relies on the datastore to, well, work.
 
   On Thu, Sep 3, 2009 at 5:34 AM, Traveler1980 jshar...@gmail.com
 wrote:
 
   Datastore GET error rate is still 100%.  Any ETA on when this will be
   resolved?
 
   Regards,
   JS
 
   On Sep 3, 3:41 am, Hani Naguib haninag...@gmail.com wrote:
I am also getting many error 500 pages.
This is happening since the issue I mentioned here:
  http://groups.google.com/group/google-appengine-java/browse_thread/th.
 ..
 
   --
   I'm not responcabel fer my computer's spleling errnors - Xlorep
 DarkHelm
   Website:http://darkhelm.org
 


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[appengine-java] Re: GAE down? Response Error 500

It looks like your application is being terminated due to exceeding request
deadlines. If you look in your application logs, you can see warnings such
as:

Request was aborted after waiting too long to attempt to service your
 request. Most likely, this indicates that you have reached your simultaneous
 active 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.


If you look at the duration of requests to /showsort/list, you can see that
they exceed the 30 second limit on http requests.

On Fri, Sep 4, 2009 at 1:48 PM, Xlorep DarkHelm ch...@darkhelm.org wrote:


 I can see the requests being made when I look at the logs for when the
 app runs. So there definitely are requests for /showsort/list being
 called, by my app. This is an automatic call, which has been working
 fine up until 2 days ago. Coincidentally about the same time that the
 updates previously mentioned which had to be rolled back were done.

 On Sep 4, 10:44 am, Toby Reyelts to...@google.com wrote:
  I can't see that any RPCs are ever made from your client application to
 the
  server. How are you testinghttp://showsort.appspot.com/showsort/list?
 You
  can't follow that directly from a browser (i.e. put it in your address
 bar),
  because GWT RPC does not support HTTP GET requests - it will give you
 some
  error code back like a 400 or a 500.
 
  Can you reproduce any of this on the local dev_appserver? If so, then you
  can use a debugger to track down the problem. If not, then you should add
  some code to your GWT client to track down why it appears the RPC is not
  being initiated.
 
  On Fri, Sep 4, 2009 at 11:42 AM, Xlorep DarkHelm ch...@darkhelm.org
 wrote:
 
   Application ID is showsort.
 
   I can't provide stacktraces for the error, because I'm getting no
   stacktraces. It isn't even showing up in the logs as a problem. I'm
   seeing a 500 error, where there used to not be a 500 error. I've not
   modified the code for my list servlet in several days, but this is now
   not working, and hasn't been since yesterday, and it appears to be the
   same problem it had a couple days ago during the short window.
 
   On Sep 4, 8:31 am, Toby Reyelts to...@google.com wrote:
Cliff,
We're not aware of any datastore problems. As Matthew posted two days
   ago,
there was a short window where changes were introduced that may have
   caused
some problems for some applications, so we rolled them back in short
   order.
If after further investigation you still believe these are App Engine
problems, please provide us with more information such as stacktraces
 and
your application id. You can always check our status
sitehttp://code.google.com/status/appengine/to see if it appears
that App Engine is having problems in general.
 
On Fri, Sep 4, 2009 at 10:21 AM, Cliff Hill ch...@darkhelm.org
 wrote:
 Still unable to do datastore gets. Well, for about 3 hours
 yesterday,
   it
 worked, and then it stopped. And it is still stopped as of this
   morning. Any
 chance that I'll be able to use my datastore code sometime in the
 near
 future? My app really kinda relies on the datastore to, well, work.
 
 On Thu, Sep 3, 2009 at 5:34 AM, Traveler1980 jshar...@gmail.com
   wrote:
 
 Datastore GET error rate is still 100%.  Any ETA on when this will
 be
 resolved?
 
 Regards,
 JS
 
 On Sep 3, 3:41 am, Hani Naguib haninag...@gmail.com wrote:
  I am also getting many error 500 pages.
  This is happening since the issue I mentioned here:

 http://groups.google.com/group/google-appengine-java/browse_thread/th.
   ..
 
 --
 I'm not responcabel fer my computer's spleling errnors - Xlorep
   DarkHelm
 Website:http://darkhelm.org
 


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[appengine-java] Re: GAE down? Response Error 500


Ok, I added in logging directly to the servlet facade I have which
wraps my Jython servlet to make it work on Google Apps Engine, and I'm
not even getting that to show up in the logs. Here's what my last
request produced (when I show requests only):

#

   1.
  09-04 11:08AM 17.783 /showsort/list 500 42787ms 131cpu_ms
131api_cpu_ms 0kb Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:
1.9.1.2) Gecko/20090729 Firefox/3.5.2,gzip(gfe)
  See details

  207.166.99.104 - - [04/Sep/2009:11:09:00 -0700] POST /showsort/
list HTTP/1.1 500 0 http://showsort.appspot.com/showsort/
0C52346D6CD87DD73B3C69C32B528FB5.cache.html Mozilla/5.0 (Windows; U;
Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2,gzip
(gfe)



This is from the GWT-RPC request, just before it, everything is
working perfectly fine for my /showsort/display servlet:

#

   1.
  09-04 11:08AM 17.781 /showsort/display 200 5576ms 9100cpu_ms 1kb
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/
20090729 Firefox/3.5.2,gzip(gfe)
  See details

  207.166.99.104 - - [04/Sep/2009:11:08:23 -0700] POST /showsort/
display HTTP/1.1 200 1346 http://showsort.appspot.com/showsort/
0C52346D6CD87DD73B3C69C32B528FB5.cache.html Mozilla/5.0 (Windows; U;
Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2,gzip
(gfe) showsort.appspot.com

   2.
  D 09-04 11:08AM 20.932

  DisplayServlet start: [ENTER]

   3.
  D 09-04 11:08AM 21.264

  DisplayServlet start: [LEVEL 1] Client ID =
e9d1b50f-997d-11de-86aa-bb87edc68d5c

   4.
  D 09-04 11:08AM 21.811

  DisplayServlet run: [LEVEL 1] Starting step: Initialize.

   5.
  I 09-04 11:08AM 22.263

  DisplayServlet run: Time to process Initialize: 0.00799989700317

   6.
  I 09-04 11:08AM 22.617

  DisplayServlet start: Number of updates returned: 102

   7.
  D 09-04 11:08AM 23.032

  DisplayServlet start: [EXIT]


And then I have the requests for the various resources the page
initially requests, and the original main servlet at / shows this:

#

   1.
  09-04 11:07AM 58.906 / 200 17476ms 29205cpu_ms 0kb Mozilla/5.0
(Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/
3.5.2,gzip(gfe)
  See details

  207.166.99.104 - - [04/Sep/2009:11:08:16 -0700] GET / HTTP/1.1
200 703 - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2)
Gecko/20090729 Firefox/3.5.2,gzip(gfe) showsort.appspot.com

   2.
  W 09-04 11:08AM 01.891

  [showsort/1.336104640234288137].stderr: *sys-package-mgr*: The
java security manager isn't allowing access to the package cache dir,
'cachedir/packages'




Which is fine. Now, I've checked my web.xml file, and it seems to be
correct, I've checked the Service interface in my GWT code and it is
pointing to the correct path to access the servlet, and I've rechecked
my code that calls the GWT-RPC servlet, and the servlet (and servlet
facade), it all is fine.

There just doesn't seem to be any connection going on here.

Now, I *know* that going to a GWT-RPC servlet RemoteServlet doesn't
work... but I'm getting 2 different kinds of responses, depending on
my servlet.

If I go to: http://showsort.appspot.com/showsort/display -- in Mozilla
Firefox, I get a blank page. I expect this, as it doesn't have a GET
or POST interface, and that's fine.

If I go to: http://showsort.appspot.com/showsort/list -- in Mozilla
Firefox, I get a 500 Server Error page. This is strange to me, and
unexpected.

The main fundamental difference between the two is that the list
servlet requires datastore functionality, the display servlet only
does when called upon to generate a full set of display updates for a
selected sorting algorithm... only possible if I get the list of
available sorting algorithms from the list servlet, which isn't
happening.



On Sep 4, 10:48 am, Xlorep DarkHelm ch...@darkhelm.org wrote:
 I can see the requests being made when I look at the logs for when the
 app runs. So there definitely are requests for /showsort/list being
 called, by my app. This is an automatic call, which has been working
 fine up until 2 days ago. Coincidentally about the same time that the
 updates previously mentioned which had to be rolled back were done.

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[appengine-java] Re: GAE down? Response Error 500


Oh, I also have seen these occasionally for the past 2 days, suddenly:

#

   1.
  09-04 10:37AM 58.844 /showsort/list 500 10129ms 0cpu_ms 0kb
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/532.0
(KHTML, like Gecko) Chrome/3.0.195.6 Safari/532.0,gzip(gfe)
  See details

  207.166.99.104 - - [04/Sep/2009:10:38:08 -0700] POST /showsort/
list HTTP/1.1 500 0 http://showsort.appspot.com/showsort/
099466D0895E48EB4E5CF7AD38C5FA29.cache.html Mozilla/5.0 (Windows; U;
Windows NT 5.1; en-US) AppleWebKit/532.0 (KHTML, like Gecko) Chrome/
3.0.195.6 Safari/532.0,gzip(gfe) showsort.appspot.com

   2.
  W 09-04 10:38AM 08.974

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



But they are extremely sporadic when/if they appear. I have 2 (just 2)
servlets which may be called simultaneously. The list one
automatically re-sends to check for an update every 10 minutes, while
the display one is called when someone presses the send button (and
only if there actually is a list of radio buttons to pick from,
retrieved from the list servlet). I think it is peculiar that
something as simple as my little app could have overwhelmed my quota.
Especially as my Quota page completely disagrees and shows I'm well
under my quota in all regards.

My app's latency isn't too high, I've minimized it to where it
generally has about 3 - 4 seconds at most (I think the list might take
6, but I'm planning on working on that). There was a point that the
display servlet was taking incredibly long, but I've made massive
headway on reducing that. So I'm shocked, completely, if my quota
somehow was exceeded, especially as I don't see any evidence of it.
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[appengine-java] JCache best practices

2009-09-04 Thread Erem


Hey guys,

Would appreciate your help in answering a few specific questions about
using the JCache API on my AppEngine project.

(1) Are any of the following three operations so expensive (like
JDOHelper.getPersistenceManagerFactory()) that I should try to only do
them once in the application and carry around a singleton of their
result from then on?
  (a) CacheManager.getInstance()
  (b) .getCacheFactory()
  (c) .getCache()

(2) Is there a reason I shouldn't have an application-wide singleton
Cache instance that I create on startup? What about CacheFactory? What
about an instance of CacheManager?

(3) Should I forget all this singleton business and call
CacheManager.getInstance().getCache(myCache) every time I need it in a
method? Does that cost me in performance at all?

Thanks for the advice!

Erem
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[appengine-java] Re: GAE down? Response Error 500

Unfortunately, when you exceed the request deadline, you can lose your logs
for that request. I would suggest paring your RPC down to the very bare
minimum, so that you're not exceeding the deadline, then adding in logic and
logging timings as you go. You should then be able to narrow things down to
the slow operations which are causing you problems.

On Fri, Sep 4, 2009 at 2:35 PM, Xlorep DarkHelm ch...@darkhelm.org wrote:


 Yes, I've upgraded to 1.2.5, I did yesterday in an effort to figure
 this out myself, and it didn't affect anything. My app is using:

 Google App Engine 1.2.5
 Google Web Toolkit 1.7.0
 GWT-Incubator for 1.7.0 (14 Jul 2009)
 Jython 2.5.0

 I'm doing everything in Eclipse 3.5 (Galileo) with the Google Plugin
 for Eclipse 3.5, 1.1.0 and Pydev 1.5.0 (for my Jython stuff)

 On Sep 4, 11:28 am, Toby Reyelts to...@google.com wrote:
  Before we go any further, can you confirm that you've upgraded your
  application to the latest 1.2.5 version, including updating all App
 Engine
  libraries (such as appengine-api.jar and the ORM libraries) in your
  WEB-INF/lib? This shouldn't be strictly necessary, but it would help
 narrow
  down the problem.
 
  On Fri, Sep 4, 2009 at 2:21 PM, Xlorep DarkHelm ch...@darkhelm.org
 wrote:
 
   Ok, I added in logging directly to the servlet facade I have which
   wraps my Jython servlet to make it work on Google Apps Engine, and I'm
   not even getting that to show up in the logs. Here's what my last
   request produced (when I show requests only):
 
   #
 
 1.
09-04 11:08AM 17.783 /showsort/list 500 42787ms 131cpu_ms
   131api_cpu_ms 0kb Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:
   1.9.1.2) Gecko/20090729 Firefox/3.5.2,gzip(gfe)
See details
 
207.166.99.104 - - [04/Sep/2009:11:09:00 -0700] POST /showsort/
   list HTTP/1.1 500 0 http://showsort.appspot.com/showsort/
   0C52346D6CD87DD73B3C69C32B528FB5.cache.html Mozilla/5.0 (Windows; U;
   Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2,gzip
   (gfe)
 
   This is from the GWT-RPC request, just before it, everything is
   working perfectly fine for my /showsort/display servlet:
 
   #
 
 1.
09-04 11:08AM 17.781 /showsort/display 200 5576ms 9100cpu_ms 1kb
   Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/
   20090729 Firefox/3.5.2,gzip(gfe)
See details
 
207.166.99.104 - - [04/Sep/2009:11:08:23 -0700] POST /showsort/
   display HTTP/1.1 200 1346 http://showsort.appspot.com/showsort/
   0C52346D6CD87DD73B3C69C32B528FB5.cache.html Mozilla/5.0 (Windows; U;
   Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/3.5.2,gzip
   (gfe) showsort.appspot.com
 
 2.
D 09-04 11:08AM 20.932
 
DisplayServlet start: [ENTER]
 
 3.
D 09-04 11:08AM 21.264
 
DisplayServlet start: [LEVEL 1] Client ID =
   e9d1b50f-997d-11de-86aa-bb87edc68d5c
 
 4.
D 09-04 11:08AM 21.811
 
DisplayServlet run: [LEVEL 1] Starting step: Initialize.
 
 5.
I 09-04 11:08AM 22.263
 
DisplayServlet run: Time to process Initialize: 0.00799989700317
 
 6.
I 09-04 11:08AM 22.617
 
DisplayServlet start: Number of updates returned: 102
 
 7.
D 09-04 11:08AM 23.032
 
DisplayServlet start: [EXIT]
 
   And then I have the requests for the various resources the page
   initially requests, and the original main servlet at / shows this:
 
   #
 
 1.
09-04 11:07AM 58.906 / 200 17476ms 29205cpu_ms 0kb Mozilla/5.0
   (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2) Gecko/20090729 Firefox/
   3.5.2,gzip(gfe)
See details
 
207.166.99.104 - - [04/Sep/2009:11:08:16 -0700] GET / HTTP/1.1
   200 703 - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.2)
   Gecko/20090729 Firefox/3.5.2,gzip(gfe) showsort.appspot.com
 
 2.
W 09-04 11:08AM 01.891
 
[showsort/1.336104640234288137].stderr: *sys-package-mgr*: The
   java security manager isn't allowing access to the package cache dir,
   'cachedir/packages'
 
   Which is fine. Now, I've checked my web.xml file, and it seems to be
   correct, I've checked the Service interface in my GWT code and it is
   pointing to the correct path to access the servlet, and I've rechecked
   my code that calls the GWT-RPC servlet, and the servlet (and servlet
   facade), it all is fine.
 
   There just doesn't seem to be any connection going on here.
 
   Now, I *know* that going to a GWT-RPC servlet RemoteServlet doesn't
   work... but I'm getting 2 different kinds of responses, depending on
   my servlet.
 
   If I go to:http://showsort.appspot.com/showsort/display-- in Mozilla
   Firefox, I get a blank page. I expect this, as it doesn't have a GET
   or POST interface, and that's fine.
 
   If I go to:http://showsort.appspot.com/showsort/list-- in Mozilla
   Firefox, I get a 500 Server Error page. This is strange to me, and
   unexpected.
 
   The main fundamental

[appengine-java] After upgrade to Java SDK 1.2.5 Key property saved but retrieved as null

2009-09-04 Thread Yegor


Hi,

I am experiencing a problem after upgrading to Java SDK 1.2.5. In a
simple CMS application a page is stored as a CMSPage entity, which
points to its text saved as a DetachedText entity using a Key property
(i.e. an unowned relationship) as follows:

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class CMSPage {

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

  @Persistent
  private Key text;

  public Key getId() {
return id;
  }

  public void setId(Key id) {
this.id = id;
  }

  public Key getText() {
return text;
  }

  public void setText(Key text) {
this.text = text;
  }

}

The Key property text points to:

@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class DetachedText {

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

  @Persistent
  private Text content;

  public DetachedText(Text content) {
this.content = content;
  }

  public Key getId() {
return id;
  }

  public Text getContent() {
return content;
  }

}

NOTE: I have removed other properties and code that I found unrelated
to the problem

After saving the page I can see the text field populated in the
development console. The value shows as DetachedText(5). I also
verified that the DetachedText entity exists and its ID equals 5.

However, after I retrieve CMSPage from the datastore using a
javax.jdo.Query the text field in the retrieved object is null (both
the Eclipse debugger and the application throwing NPE confirm it).

What am I doing wrong?

Any pointers will be appreciated.

Thanks,

Yegor
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[appengine-java] Java memcache increment with initial value


I notice that the Python memcache API supports an increment with
initial value operation:


http://code.google.com/appengine/docs/python/memcache/clientclass.html#Client_incr

Are there any plans to support this on Java? In the Python
implementation, is this simply done as three memcache calls, something
like this:

Long counter = memcache.increment( key, 1 );
if ( counter == null ) {
memcache.put( key, (long)0, null, SetPolicy.ADD_ONLY_IF_NOT_PRESENT );
counter = memcache.increment( key, 1 );
}

If that's all Python is doing, then I don't see any value of adding it
to Java; but, if the Python implementation is somehow more efficient
than the three memcache calls in the Java example above, then I'd like
to see it added to Java.

Thanks.

Vince

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[appengine-java] new stack traces after upgrading to SDK 1.2.5


After upgrading to SDK 1.2.5, I've noticed a set of stack traces that
show up in both the development environment and on the production
server. These only appear if the logging level is set to INFO, and
they show up as INFO logs on the production server. I'm pretty sure
these are new in SDK 1.2.5 since I've been running at the INFO logging
level for quite some time. They only happen for the first request
after the application has been restarted. From my production server:

com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue$SystemLoader
loadFinalizer: Not allowed to access system class loader.

com.google.appengine.repackaged.com.google.common.base.internal.Finalizer
getInheritableThreadLocalsField: Couldn't access
Thread.inheritableThreadLocals. Reference finalizer threads will
inherit thread local values.

com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue
init: Failed to start reference finalizer thread. Reference cleanup
will only occur when new references are created.
java.lang.reflect.InvocationTargetException
at 
com.google.appengine.runtime.Request.process-ad303eae7c610e90(Request.java)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Method.java:40)
at 
com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue.init(FinalizableReferenceQueue.java:124)
at 
com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools$WeakInterningPool.clinit(InterningPools.java:104)
at 
com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools.newWeakInterningPool(InterningPools.java:48)
at 
com.google.appengine.repackaged.com.google.io.protocol.ProtocolSupport.clinit(ProtocolSupport.java:55)
at 
com.google.apphosting.api.DatastorePb$Query.init(DatastorePb.java:1072)
at 
com.google.apphosting.api.DatastorePb$Query$1.init(DatastorePb.java:2355)
at 
com.google.apphosting.api.DatastorePb$Query.clinit(DatastorePb.java:2355)
at 
com.google.appengine.api.datastore.QueryTranslator.convertToPb(QueryTranslator.java:27)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.convertToPb(DatastoreServiceImpl.java:357)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.runQuery(DatastoreServiceImpl.java:339)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.access$100(DatastoreServiceImpl.java:269)
at 
com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl$1.iterator(DatastoreServiceImpl.java:303)
at 
org.apache.jsp.test.listEntities_jsp._jspService(listEntities_jsp.java:49)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
...truncated

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[appengine-java] Re: GAE down? Response Error 500


I set up a doGet method on my list servlet, which should just display
the list of algorithm names that is retrieved from the datastore.
There are 13 items in the list, not much.

http://showsort.appspot.com/showsort/list

This way, you don't need to use the rest of the app to see this.

I'm getting a 500 Server Error. There has been two times that I have
gotten more than just the initial request line logged in the Admin
Panel's logs. Both times, it halts on the step where it is trying to
read from the DataStore. My code to do that worked just fine before
the 1.2.5 change 2 days ago. Now it seems to be hanging and getting a
hard deadline limit error produced:

09-04 01:55PM 50.733

/showsort/list
com.google.apphosting.api.DeadlineExceededException: This request
(8d11090a3c971760) started at 2009/09/04 20:55:22.204 UTC and was
still executing at 2009/09/04 20:55:50.718 UTC.
at org.python.core.PyException.tracebackHere(PyException.java:155)
at org.python.core.PyException.tracebackHere(PyException.java:145)
at org.python.core.PyTableCode.call(PyTableCode.java:169)
at org.python.core.PyBaseCode.call(PyBaseCode.java:297)
at org.python.core.PyBaseCode.call(PyBaseCode.java:191)
at org.python.core.PyFunction.__call__(PyFunction.java:385)
at org.python.core.PyMethod.__call__(PyMethod.java:215)
at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:
221)
at org.python.core.PyMethod.__call__(PyMethod.java:206)
at org.python.core.PyObject.__call__(PyObject.java:367)
at org.python.core.PyObject._jcallexc(PyObject.java:3504)
at org.python.core.PyObject._jcall(PyObject.java:3536)
at org.python.proxies.os$PythonPOSIXHandler$0.error(Unknown Source)
at org.python.posix.JavaLibCHelper.stat(JavaLibCHelper.java:172)
at org.python.posix.JavaPOSIX.stat(JavaPOSIX.java:172)
at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_
$3.run(Method_.java:164)
at java.security.AccessController.doPrivileged(Native Method)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke
(Method_.java:162)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_
(Method_.java:131)
at
com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke
(Method_.java:40)
at org.python.core.PyReflectedFunction.__call__
(PyReflectedFunction.java:175)
at org.python.core.PyObject.__call__(PyObject.java:355)
at org.python.core.PyMethod.__call__(PyMethod.java:215)
at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:
221)
at org.python.core.PyMethod.__call__(PyMethod.java:206)
at org.python.core.PyObject.__call__(PyObject.java:397)
at org.python.core.PyObject.__call__(PyObject.java:401)
at os$py.stat$38(/base/data/home/apps/showsort/1.336107385381934633/
WEB-INF/lib-python/Lib.zip/os.py:497)
at os$py.call_function(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/os.py)
at org.python.core.PyTableCode.call(PyTableCode.java:165)
at org.python.core.PyBaseCode.call(PyBaseCode.java:131)
at org.python.core.PyFunction.__call__(PyFunction.java:317)
at linecache$py.updatecache$5(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/linecache.py:136)
at linecache$py.call_function(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/linecache.py)
at org.python.core.PyTableCode.call(PyTableCode.java:165)
at org.python.core.PyBaseCode.call(PyBaseCode.java:146)
at org.python.core.PyFunction.__call__(PyFunction.java:327)
at linecache$py.getlines$3(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/linecache.py:40)
at linecache$py.call_function(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/linecache.py)
at org.python.core.PyTableCode.call(PyTableCode.java:165)
at org.python.core.PyBaseCode.call(PyBaseCode.java:146)
at org.python.core.PyFunction.__call__(PyFunction.java:327)
at inspect$py.findsource$30(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/inspect.py:522)
at inspect$py.call_function(/base/data/home/apps/showsort/
1.336107385381934633/WEB-INF/lib-python/Lib.zip/inspect.py)
at org.python.core.PyTableCode.call(PyTableCode.java:165)
at org.python.core.PyBaseCode.call(PyBaseCode.java:131)
at org.python.core.PyFunction.__call__(PyFunction.java:317)
at

[appengine-java] Re: GAE down? Response Error 500


Request deadline? I've not been exceeding any request deadline. I'm
getting this a lot now:

#

   1.
  09-04 12:01PM 00.892 /showsort/list-- 500 10455ms 0cpu_ms 0kb
Mozilla/5.0 (en-us) AppleWebKit/525.13 (KHTML, like Gecko) Version/3.1
Safari/525.13,gzip(gfe)
  See details

  72.14.192.66 - - [04/Sep/2009:12:01:11 -0700] GET /showsort/
list-- HTTP/1.1 500 0 - Mozilla/5.0 (en-us) AppleWebKit/525.13
(KHTML, like Gecko) Version/3.1 Safari/525.13,gzip(gfe)
showsort.appspot.com

   2.
  W 09-04 12:01PM 11.348

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


---

the problem with this is when I check my Quota page, I'm way, WAY
below my limit. There are only two things that show any sign of being
used by the quotas:

CPU Time4%  0.27 of 6.50 CPU hours  Okay

Deployments 2%  6 of 250Okay

Everything else is at 0%.

My requests are:

Requests0%  201 of 128  Okay


If I've reached my simultaneous active request limit, somehow...
where would I even be able to see that? I'm thinking that's a false
alarm. Especially as my app really is not that taxing, at all. The
vast majority of the processing for it (the graphics/UI processing) is
done through GWT on the client side.


On Sep 4, 11:57 am, Toby Reyelts to...@google.com wrote:
 Unfortunately, when you exceed the request deadline, you can lose your logs
 for that request. I would suggest paring your RPC down to the very bare
 minimum, so that you're not exceeding the deadline, then adding in logic and
 logging timings as you go. You should then be able to narrow things down to
 the slow operations which are causing you problems.

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[appengine-java] Re: new stack traces after upgrading to SDK 1.2.5

2009-09-04 Thread Yegor


Vince,

If you are interested the reason for the exception is that App Engine
does not support threads. Reference finalizer usually runs as a
separate thread. In this case the finalizer (correctly) failed to
initialize. However, it looks like finalizer is not a critical
component in this context.

Guice prints a similar stacktrace for its reference finalizer too,
also as INFO.

Cheers,

Yegor


On Sep 4, 1:41 pm, Vince Bonfanti vbonfa...@gmail.com wrote:
 After upgrading to SDK 1.2.5, I've noticed a set of stack traces that
 show up in both the development environment and on the production
 server. These only appear if the logging level is set to INFO, and
 they show up as INFO logs on the production server. I'm pretty sure
 these are new in SDK 1.2.5 since I've been running at the INFO logging
 level for quite some time. They only happen for the first request
 after the application has been restarted. From my production server:

 com.google.appengine.repackaged.com.google.common.base.FinalizableReference 
 Queue$SystemLoader
 loadFinalizer: Not allowed to access system class loader.

 com.google.appengine.repackaged.com.google.common.base.internal.Finalizer
 getInheritableThreadLocalsField: Couldn't access
 Thread.inheritableThreadLocals. Reference finalizer threads will
 inherit thread local values.

 com.google.appengine.repackaged.com.google.common.base.FinalizableReference 
 Queue
 init: Failed to start reference finalizer thread. Reference cleanup
 will only occur when new references are created.
 java.lang.reflect.InvocationTargetException
         at 
 com.google.appengine.runtime.Request.process-ad303eae7c610e90(Request.java)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
         at java.lang.reflect.Method.invoke(Method.java:40)
         at 
 com.google.appengine.repackaged.com.google.common.base.FinalizableReference 
 Queue.init(FinalizableReferenceQueue.java:124)
         at 
 com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools$ 
 WeakInterningPool.clinit(InterningPools.java:104)
         at 
 com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools. 
 newWeakInterningPool(InterningPools.java:48)
         at 
 com.google.appengine.repackaged.com.google.io.protocol.ProtocolSupport.cli 
 nit(ProtocolSupport.java:55)
         at 
 com.google.apphosting.api.DatastorePb$Query.init(DatastorePb.java:1072)
         at 
 com.google.apphosting.api.DatastorePb$Query$1.init(DatastorePb.java:2355)
         at 
 com.google.apphosting.api.DatastorePb$Query.clinit(DatastorePb.java:2355)
         at 
 com.google.appengine.api.datastore.QueryTranslator.convertToPb(QueryTransla 
 tor.java:27)
         at 
 com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.c 
 onvertToPb(DatastoreServiceImpl.java:357)
         at 
 com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.r 
 unQuery(DatastoreServiceImpl.java:339)
         at 
 com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.a 
 ccess$100(DatastoreServiceImpl.java:269)
         at 
 com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl$1 
 .iterator(DatastoreServiceImpl.java:303)
         at 
 org.apache.jsp.test.listEntities_jsp._jspService(listEntities_jsp.java:49)
         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
         at 
 org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
 ...truncated
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[appengine-java] Discussion on will-it-play-in-app-engine

2009-09-04 Thread Geraldo Lopes


Please create a JasperReports entry.
Sadly it's not compatible
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[appengine-java] Re: After upgrade to Java SDK 1.2.5 Key property saved but retrieved as null

2009-09-04 Thread Yegor


Just so you know, I think I have solved the problem by setting
defaultFetchGroup=true on the Key property:

@Persistent(defaultFetchGroup=true)
private Key text;

Might have something to do with the recently closed issue #58 Queries
don't respect fetch groups: 
http://code.google.com/p/datanucleus-appengine/issues/detail?id=58

What's puzzling is that I have unowned relationships all over the
application, however only one class - CMSPage - fails to retrieve the
Key properties.

I am not sure why Key is not automatically in the default fetch group.
Key is not an entity class. It should be ok to fetch it non-lazily by
default.

Yegor

On Sep 4, 1:21 pm, Yegor yegor.jba...@gmail.com wrote:
 Hi,

 I am experiencing a problem after upgrading to Java SDK 1.2.5. In a
 simple CMS application a page is stored as a CMSPage entity, which
 points to its text saved as a DetachedText entity using a Key property
 (i.e. an unowned relationship) as follows:

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 public class CMSPage {

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

   @Persistent
   private Key text;

   public Key getId() {
     return id;
   }

   public void setId(Key id) {
     this.id = id;
   }

   public Key getText() {
     return text;
   }

   public void setText(Key text) {
     this.text = text;
   }

 }

 The Key property text points to:

 @PersistenceCapable(identityType = IdentityType.APPLICATION)
 public class DetachedText {

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

   @Persistent
   private Text content;

   public DetachedText(Text content) {
     this.content = content;
   }

   public Key getId() {
     return id;
   }

   public Text getContent() {
     return content;
   }

 }

 NOTE: I have removed other properties and code that I found unrelated
 to the problem

 After saving the page I can see the text field populated in the
 development console. The value shows as DetachedText(5). I also
 verified that the DetachedText entity exists and its ID equals 5.

 However, after I retrieve CMSPage from the datastore using a
 javax.jdo.Query the text field in the retrieved object is null (both
 the Eclipse debugger and the application throwing NPE confirm it).

 What am I doing wrong?

 Any pointers will be appreciated.

 Thanks,

 Yegor
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[appengine-java] Re: GAE down? Response Error 500


When uploading a new version, with a few more levels of debugging
enabled:


Compiling module org.darkhelm.showsort.ShowSort
   Compiling 6 permutations
  Permutation compile succeeded
   Linking into F:\Documents\Eclipse\workspace\ShowSort\war
  Link succeeded
   Compilation succeeded -- 95.312s
Creating staging directory
Scanning for jsp files.
Compiling jsp files.
Compiling java files.
Scanning files on local disk.
Initiating update.
Cloning 31 static files.
Cloning 116 application files.
Cloned 100 files.
Uploading 3 files.
Uploaded 1 files.
Uploaded 2 files.
Uploaded 3 files.
Deploying new version.
Rolling back the update.
java.io.IOException: Error posting to URL:
http://appengine.google.com/api/appversion/deploy?app_id=showsortversion=1;
500 Internal Server Error

Server Error (500)
A server error has occurred.


Debugging information may be found in F:\Documents\Eclipse\temp
\appengine-deploy8021509217612458213.log

Contents of that file:

Unable to upload:
java.io.IOException: Error posting to URL:
http://appengine.google.com/api/appversion/deploy?app_id=showsortversion=1;
500 Internal Server Error

Server Error (500)
A server error has occurred.

at com.google.appengine.tools.admin.ServerConnection.send
(ServerConnection.java:143)
at com.google.appengine.tools.admin.ServerConnection.post
(ServerConnection.java:81)
at com.google.appengine.tools.admin.AppVersionUpload.send
(AppVersionUpload.java:429)
at com.google.appengine.tools.admin.AppVersionUpload.deploy
(AppVersionUpload.java:388)
at com.google.appengine.tools.admin.AppVersionUpload.commit
(AppVersionUpload.java:351)
at com.google.appengine.tools.admin.AppVersionUpload.doUpload
(AppVersionUpload.java:111)
at com.google.appengine.tools.admin.AppAdminImpl.update
(AppAdminImpl.java:53)
at com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy
(AppEngineBridgeImpl.java:271)
at
com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace
(DeployProjectJob.java:148)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run
(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

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[appengine-java] Re: new stack traces after upgrading to SDK 1.2.5


That's fine. :)

I just wanted to make sure someone was aware of this, since it
appeared to be something new introduced with the latest SDK.

On Fri, Sep 4, 2009 at 4:14 PM, Toby Reyeltsto...@google.com wrote:
 It's a message that you can safely ignore. There is a reason it's logged at
 INFO. :)


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[appengine-java] Re: Discussion on will-it-play-in-app-engine

Jimbo,

Would you mind seeing if this issue goes away with the latest 1.2.5?

On Tue, Aug 25, 2009 at 4:03 AM, Jimbo ji...@google-app-engine.com wrote:


 Hi,

 I managed to get spring security working by amending the source as
 suggested at: http://www.dotnetguru2.org/bmarchesson/index.php?p=1100

 If anyone would like a link to the re-compiled core jar I created
 please feel free to download at:


 http://www.google-app-engine.com/blog/post/Spring-security-fix-for-google-app-engine.aspx

 Jim
 


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[appengine-java] Re: GAE down? Response Error 500

Your app:

/showsort/list 500 41106ms
 /showsort/list 500 29590ms
 /showsort/list 500 40991ms
 /showsort/list 500 40340ms
 /showsort/list 500 30155ms
 /showsort/list 500 35481ms
 /showsort/list 500 40109ms
 /showsort/list 500 42148ms

 /showsort/list
 com.google.apphosting.api.DeadlineExceededException: This request
 (675bc7926055c7e2) started at 2009/09/04 21:33:38.750 UTC and was still
 executing at 2009/09/04 21:34:07.223 UTC


You are exceeding the 30s request deadline with prejudice on every single
request to /showsort/list. Your app gets terminated each time, which causes
it to have to be reloaded from scratch for subsequent requests. App reloads
can be expensive (and it appears that yours are), and that seems likely to
be the root cause behind the warnings you're receiving about excessively
high latency. In terms of quota, the warning is specifically describing your
simultaneous active request limit, not long-term quota like CPU time or
datastore usage.

On Fri, Sep 4, 2009 at 3:56 PM, Xlorep DarkHelm ch...@darkhelm.org wrote:


 Request deadline? I've not been exceeding any request deadline. I'm
 getting this a lot now:

 #

   1.
  09-04 12:01PM 00.892 /showsort/list-- 500 10455ms 0cpu_ms 0kb
 Mozilla/5.0 (en-us) AppleWebKit/525.13 (KHTML, like Gecko) Version/3.1
 Safari/525.13,gzip(gfe)
  See details

  72.14.192.66 - - [04/Sep/2009:12:01:11 -0700] GET /showsort/
 list-- HTTP/1.1 500 0 - Mozilla/5.0 (en-us) AppleWebKit/525.13
 (KHTML, like Gecko) Version/3.1 Safari/525.13,gzip(gfe)
 showsort.appspot.com

   2.
  W 09-04 12:01PM 11.348

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


 ---

 the problem with this is when I check my Quota page, I'm way, WAY
 below my limit. There are only two things that show any sign of being
 used by the quotas:

 CPU Time4%  0.27 of 6.50 CPU hours  Okay

 Deployments 2%  6 of 250Okay

 Everything else is at 0%.

 My requests are:

 Requests0%  201 of 128  Okay


 If I've reached my simultaneous active request limit, somehow...
 where would I even be able to see that? I'm thinking that's a false
 alarm. Especially as my app really is not that taxing, at all. The
 vast majority of the processing for it (the graphics/UI processing) is
 done through GWT on the client side.


 On Sep 4, 11:57 am, Toby Reyelts to...@google.com wrote:
  Unfortunately, when you exceed the request deadline, you can lose your
 logs
  for that request. I would suggest paring your RPC down to the very bare
  minimum, so that you're not exceeding the deadline, then adding in logic
 and
  logging timings as you go. You should then be able to narrow things down
 to
  the slow operations which are causing you problems.

 


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[appengine-java] QueueFactory.getQueue( String )


My first question on task queues...

I'd like to design my application to use a named (configured) queue if
it exists, but to drop back to using the default queue if the named
queue isn't configured. I'd like to do something like this:

Queue q = QueueFactory.getQueue( myQueue );
if ( q == null ) {
q = QueueFactory.getDefaultQueue();
}

But, the documentation for QueueFactory.getQueue( String ) implies
that this isn't how it works:

Attempting to use a non-existing queue name may result in errors
at the point of use of the Queue object and not when calling
getQueue(String).

Is there a way to simply and reliably determine whether a given queue
name has been configured?

Vince

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[appengine-java] Re: Confirmation of Google Multi-Tenant app policy

2009-09-04 Thread doc


Thank you Jason for your reply

I will file


On 9月5日, 午前2:53, Jason (Google) apija...@google.com wrote:
 Currently, registering multiple IDs for the same application is a violation
 of the App Engine terms of service. However, we do have an exception policy
 in place for developers with a multi-tenant strategy, and we handle these on
 a case-by-case basis. To begin, please file a new multi-instance exception
 request:

 http://code.google.com/support/bin/request.py?contact_type=AppEngineM...

 - Jason

 On Wed, Sep 2, 2009 at 5:33 AM, doc123 doc.u...@gmail.com wrote:

  Hi

  Now I am planning to start free project management service  =
 http://www.chainofasker.com/by using Google App Engine

  When I try to provide this free project management service, problem is
  server fee because once I release this service,  I can not expect how
  many user come to this site and use free service.

  So I want to ask user to have their dedicated server if they want use
  stable service. Procedure is following

  User create User own account at Google app engine site.
  User nominate me as a administrator or invite me as a developer.
  I install server software.
  User remove me from administrator list.
  User start using my service

  Is this meet Google App Engine’s terms of use?

  I found related article which is posted by Jason but now I can not
  find it url so I post previous multi-tenant discussion image to here
  =http://www.chainofasker.com/muti-tenant-past-post

  I think above procedure is keeping Jason’s recommendation.


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[appengine-java] Re: how to query to implement auto suggest query...

There are numerous tutorials out in the wild for this. I don't know of any
App Engine-specific examples, but they shouldn't be too hard to find. Since
App Engine doesn't currently support full-text search, you'll only be able
to match entities on their opening characters.

http://www.dynamicajax.com/fr/AJAX_Suggest_Tutorial-.html
http://www.google.com/search?q=ajax+suggest

- Jason

On Thu, Sep 3, 2009 at 3:08 AM, mar_novice mariocape1...@gmail.com wrote:


 Hi,
 I dont know how to implement a back-end for an autosuggest query.
 The idea is if a user type
 sa, the servlet will query from the datastore, for example employee
 names that starts with sa.

 Any body knows how to implement this??

 Thanks...

 -mar_novice

 


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[appengine-java] Re: how to query to implement auto suggest query...

By they shouldn't be too hard to find, I meant that any examples you find
shouldn't be too hard to tailor for App Engine, even if they are
RDBMS-based.
- Jason

On Fri, Sep 4, 2009 at 4:06 PM, Jason (Google) apija...@google.com wrote:

 There are numerous tutorials out in the wild for this. I don't know of any
 App Engine-specific examples, but they shouldn't be too hard to find. Since
 App Engine doesn't currently support full-text search, you'll only be able
 to match entities on their opening characters.

 http://www.dynamicajax.com/fr/AJAX_Suggest_Tutorial-.html
 http://www.google.com/search?q=ajax+suggest

 - Jason

 On Thu, Sep 3, 2009 at 3:08 AM, mar_novice mariocape1...@gmail.comwrote:


 Hi,
 I dont know how to implement a back-end for an autosuggest query.
 The idea is if a user type
 sa, the servlet will query from the datastore, for example employee
 names that starts with sa.

 Any body knows how to implement this??

 Thanks...

 -mar_novice

 



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[appengine-java] Re: HttpSession handling question

Hi Marton. Yes, you need to explicitly call setAttribute() when you modify
any object in the session. Otherwise, the object won't be updated in App
Engine's cache/datastore, which are the mechanisms it uses to back sessions
- Jason

On Thu, Sep 3, 2009 at 2:11 AM, Marton Papp mapr...@gmail.com wrote:


 Hi!

 I am using HttpSession to store some information as session
 attributes. When I am testing the application locally, it works fine.
 But when I upload it to production, it seems that any session
 attributes that I retrieve from the session and modify it are not
 persisted back to the session again, unless I specifically call
 HttpSession.setAttribute() in each request. I am not sure whether it
 is the expected behavior or it is bug. Here are the two test cases:

 Test1:

 public class Test_gae_sessionServlet extends HttpServlet {
private static final String SESSION_ATTRIBUTE_NAME =
 test_session_attribute;

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
HttpSession session = req.getSession();
resp.setContentType(text/plain);

SessionContext sessionContext = (SessionContext)
 session.getAttribute
 (SESSION_ATTRIBUTE_NAME);

resp.getWriter().println(session retreived:  +
 sessionContext);

if (sessionContext==null) {
sessionContext = new SessionContext();
resp.getWriter().println(session created:  +
 sessionContext);

// calling setAttribute only when the object is
 first created
resp.getWriter().println(putting context into
 session:  +
 sessionContext);
session.setAttribute(SESSION_ATTRIBUTE_NAME,
 sessionContext);
}

sessionContext.value++;

resp.getWriter().println(context at end of retquest:  +
 sessionContext);
}
 }


 Test2:

 public class Test_gae_sessionServlet extends HttpServlet {
private static final String SESSION_ATTRIBUTE_NAME =
 test_session_attribute;

public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
HttpSession session = req.getSession();
resp.setContentType(text/plain);

SessionContext sessionContext = (SessionContext)
 session.getAttribute
 (SESSION_ATTRIBUTE_NAME);

resp.getWriter().println(session retreived:  +
 sessionContext);

if (sessionContext==null) {
sessionContext = new SessionContext();
resp.getWriter().println(session created:  +
 sessionContext);
}

// calling setAttribute in every request
resp.getWriter().println(putting context into session:  +
 sessionContext);
session.setAttribute(SESSION_ATTRIBUTE_NAME,
 sessionContext);

sessionContext.value++;

resp.getWriter().println(context at end of retquest:  +
 sessionContext);
}
 }


 The object stored in the session:

 public class SessionContext implements Serializable {

private static final long serialVersionUID = -5151175222401820614L;

public int value = 0;

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

 }


 In Test1 it is always the first version of the SessionContext that is
 retreived in each request, no matter that I try to change its contents
 during each request. Test2 works as expected. Is it so that I need to
 call HttpSession.setAttribute() for any object that is expected to
 change during the request? Is it according to the servlet
 specification?


 Marton

 


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[appengine-java] Re: Is there limitation of size of webapp uploaded to GAE?

By default, all files under war are treated as both static and resource
files. You can modify your appengine-web.xml file to explicitly indicate
which files are static and which are resource:
http://code.google.com/appengine/docs/java/config/appconfig.html#Static_Files_and_Resource_Files

- Jason

On Thu, Sep 3, 2009 at 5:47 AM, barak barak.ya...@gmail.com wrote:


 If I understood correctly - static files are the files that kept under
 the war directory. What are the resources files?

 On Sep 2, 7:19 pm, Jason (Google) apija...@google.com wrote:
  Static files can be up to 10 MB each. There is no limit on the total
 storage
  size for static files. There is, however for resource files -- the
 combined
  size of all resource files can't exceed 150 MB.
  - Jason
 
 
 
  On Mon, Aug 31, 2009 at 12:21 AM, barak barak.ya...@gmail.com wrote:
 
   I was wondering - does GAE has some limitation regarding the size of
   an applicatian uploaded to GAE? I know there is limitation regarding
   single size upload, but can my application for example holds hundreds
   of files (source, static, what ever)?
 
   Thanks.- Hide quoted text -
 
  - Show quoted text -
 


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[appengine-java] Write text on an image..?

2009-09-04 Thread jago


Hi,

I want the user to fill some text in a textfield and then allow him to
hit a 'create' button. The text will written as a title on the top of
an image. The image will then be shown in the browser.

What I didn't figure out was how to write the text on the image file.
Can somebody help me with example code?
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[appengine-java] Re: querying using ANCESTOR IS

I'm glad you got it working using the low-level API. If you ever want to
return to JDO, see the last post in this thread, which describes how to
perform ancestor queries:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/97ba3209ec6a65de

- Jason

On Thu, Sep 3, 2009 at 9:14 AM, Clay Lenhart c...@lenharts.net wrote:


 I got this working using the low-level API.

 Actually, I'm not sure what JDO gives you over this.  I wrap the low-
 level Entity with my class and give it getters and setters.  It
 doesn't feel any more or less verbose.

 


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[appengine-java] Re: GAE takes 28 sec to read just 200 records

Based on one of your recent posts, it seems like multiple
PersistenceManagerFactory instances are being created by different
classloaders. Since this is an expensive operation, this could explain why
you're experiencing such slow performance. Did you follow Toby's suggestion
in the last post?
-
1)  Are you maybe loading that singleton class in different classloaders?
Try logging the classloader object reference that tries to create the
PersistenceManagerFactory. You can add a static initializer ABOVE
pmfInstance.

static {
  logger.log(Level.SEVERE, Loading PMF in  + PMF.class.getClassLoader());
}
-

- Jason

On Thu, Sep 3, 2009 at 10:03 AM, Vik vik@gmail.com wrote:

 Hie
 Strange to hear that if it is creating PMF again

 Should it do it just once when i logged in? In the logging process I do get
 an instance of PMF. So, why it is doing that again?
 Any advise what may be going wrong here?


 Thankx and Regards

 Vik
 Founder
 www.sakshum.com
 www.sakshum.blogspot.com


 On Thu, Sep 3, 2009 at 10:25 PM, datanucleus andy_jeffer...@yahoo.comwrote:


 17.  I09-03 09:46AM 31.994
 
 vik.sakshum.sakshumweb.jsp.model.jdo.PMF clinit: Loading PMF in
  com.google.apphosting.runtime.security.userclassloa...@8fcc7b
 
 18.  I09-03 09:46AM 41.622

 Don't you think it's a strange way to benchmark things by including
 known one-off operations like creating a PMF ?
 Personally that ought to be included in application startup timings,
 rather than time taken to read 200 records.




 


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[appengine-java] Re: Bulk writes to datastore

Batch puts are supported, yes, and as of yesterday's release, calling
makePersistentAll (JDO) and the equivalent JPA call will take advantage of
this support (previously, you had to use the low-level API).

Two quick notes:

1) All of the entities that you're persisting should be in separate entity
groups since two entities in the same entity group can't be written to
consecutively, and you will see datastore timeout exceptions if many
simultaneous write requests come in for the same entity or entity group.
2) Batch puts do not operate in a transaction. This means that some writes
may succeed but others may not, so if you need the ability to rollback,
you'll need transactions.

- Jason

Let me know if you have any more questions on this.

- Jason

On Thu, Sep 3, 2009 at 7:24 PM, Nicholas Albion nalb...@gmail.com wrote:


 Is it possible to overcome the datastore's 10 writes/second limit by
 batching them?

 I've got a table containing just over one million records (in CSV
 format).  Does a batched write (of around 1MB of data and, say 1000
 records) count as one write, or 1000 writes?
 


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[appengine-java] Re: JDO queries on owned/unowned one-to-many relationships