date:20100611

[appengine-java] GUICE injection and access denied (java.lang.RuntimePermission modifyThreadGroup)

2010-06-11 Thread KasperDK

Hi,

I'm trying to do this;

public class PostalServiceImpl extends RemoteServiceServlet implements
PostalService {
private static final Logger log =
Logger.getLogger(PostalServiceImpl.class.getName());

@Inject
private PostalManager postalManager;

public PostalServiceImpl() {
Injector injector = Guice.createInjector(new 
NetGazelleModule());

injector.injectMembers(this);
}

public String getCity(String postal) {
log.info(PostalServiceImpl.getCity( + postal + ));

if (postalManager == null) {
log.severe(PostalServiceImpl.getCity: postalManager is 
null !);
}

return postalManager.getCity(postal);
}

...


But I get the following exception;

INFO: The server is running at http://localhost:/
Jun 11, 2010 6:38:57 AM
com.google.inject.internal.FinalizableReferenceQueue init
INFO: Failed to start reference finalizer thread. Reference cleanup
will only occur when new references are created.
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at
com.google.inject.internal.FinalizableReferenceQueue.init(FinalizableReferenceQueue.java:
124)
at com.google.inject.internal.MapMaker
$QueueHolder.clinit(MapMaker.java:787)
at com.google.inject.internal.MapMaker$WeakEntry.init(MapMaker.java:
946)
at com.google.inject.internal.MapMaker$Strength
$1.newEntry(MapMaker.java:312)
at com.google.inject.internal.MapMaker
$StrategyImpl.newEntry(MapMaker.java:498)
at com.google.inject.internal.MapMaker
$StrategyImpl.newEntry(MapMaker.java:419)
at com.google.inject.internal.CustomConcurrentHashMap
$ComputingImpl.get(CustomConcurrentHashMap.java:2029)
at
com.google.inject.internal.BytecodeGen.getClassLoader(BytecodeGen.java:
149)
at
com.google.inject.internal.BytecodeGen.getClassLoader(BytecodeGen.java:
132)
at
com.google.inject.internal.BytecodeGen.newFastClass(BytecodeGen.java:
162)
at com.google.inject.DefaultConstructionProxyFactory
$1.init(DefaultConstructionProxyFactory.java:54)
at
com.google.inject.DefaultConstructionProxyFactory.create(DefaultConstructionProxyFactory.java:
52)
at com.google.inject.ProxyFactory.create(ProxyFactory.java:152)
at
com.google.inject.ConstructorInjectorStore.createConstructor(ConstructorInjectorStore.java:
84)
at com.google.inject.ConstructorInjectorStore.access
$000(ConstructorInjectorStore.java:31)
at com.google.inject.ConstructorInjectorStore
$1.create(ConstructorInjectorStore.java:39)
at com.google.inject.ConstructorInjectorStore
$1.create(ConstructorInjectorStore.java:35)
at com.google.inject.internal.FailableCache
$1.apply(FailableCache.java:35)
at com.google.inject.internal.MapMaker
$StrategyImpl.compute(MapMaker.java:549)
at com.google.inject.internal.MapMaker
$StrategyImpl.compute(MapMaker.java:419)
at com.google.inject.internal.CustomConcurrentHashMap
$ComputingImpl.get(CustomConcurrentHashMap.java:2041)
at com.google.inject.internal.FailableCache.get(FailableCache.java:
46)
at
com.google.inject.ConstructorInjectorStore.get(ConstructorInjectorStore.java:
52)
at
com.google.inject.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:
57)
at com.google.inject.InjectorImpl.initializeBinding(InjectorImpl.java:
377)
at com.google.inject.BindingProcessor$1$1.run(BindingProcessor.java:
169)
at
com.google.inject.BindingProcessor.initializeBindings(BindingProcessor.java:
224)
at
com.google.inject.InjectorBuilder.initializeStatically(InjectorBuilder.java:
120)
at com.google.inject.InjectorBuilder.build(InjectorBuilder.java:105)
at com.google.inject.Guice.createInjector(Guice.java:92)
at com.google.inject.Guice.createInjector(Guice.java:69)
at com.google.inject.Guice.createInjector(Guice.java:59)
at
com.netgazelle.server.service.PostalServiceImpl.init(PostalServiceImpl.java:
20)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)

[appengine-java] Session object or memcache?

2010-06-11 Thread RAVINDER MAAN

Hello all
  what is the best option from performance point of view, storing
frequently used objects in session or loading from datastore for every
request(we can add memcache support before trying to fetch from
datastore).Can anybody tell me good link to develop high performance
and fast application development best practices link.I am using java
with JDO.
 thanks in advance.

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[appengine-java] Re: What is the best option for RPC (web services) on App engine?

2010-06-11 Thread Trung

http://code.google.com/p/gwt-syncproxy/ may be suitable for your
needs.



On Jun 10, 11:13 pm, dilbert dilbert.elbo...@gmail.com wrote:
 First I'd like to explain what I mean by RPC. I'd like to be able to
 write interfaces like this (simple Java interface):

 public interface EchoService {
   String echo(String message);

 }

 The framework would allow the creation of client classes that would
 handle the serialization from/to the RPC service. Of course the
 framework should support the serialization of ArrayLists, HashMaps and
 other collections and should also support the serialization of objects
 marked with the java.io.Serializable interface (or some other
 interface).
 We would create the RPC Client this way:

 EchoService echoService =
 RpcClientFactory.createInstance(EchoService.class,http://bla.com/
 smartApp/echo);

 And of course use it this way:

 String echoMessage = echoService.echo(The message !!!);

 The server side servlet would implement the previously mentioned
 interface.
 public class Service extends WhateverServlet implements EchoService {
     @Override
     String echo(String message) {
         return server sends: + message;
     }

 }

 A few additional nice features to have would be:
 -support for asynchronous calls (where the developer would provide a
 callback for handling the result, similar to GWT RPC)
 -the developers should be able to access the RPC client somehow to be
 able to handle Cookies or other http headers.
 -the client side should be usable from Android.

 After a long search I have found that the framework that most closely
 matches these requirements is Hessian (http://hessian.caucho.com/). It
 uses a binary protocol so it should be very fast and it works on
 Android. AFAIK it does not support async calls. However, not all is
 well. The current Hessian implementation does not handle exceptions
 well. It throws a SecurityException like this:

 java.lang.SecurityException: java.lang.IllegalAccessException:
 Reflection is not allowed on private java.lang.Throwable
 java.lang.Throwable.cause

 I considered GWT RPC for a while but it does not have a proper Java
 client or I could not find one. So I wanted to ask is there any other
 library that could be used in this case? Could the App engine team
 write such a library and add it to the SDK. Any suggestions?

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Re: [appengine-java] Already has the maximum number of versions, but I have only one.

2010-06-11 Thread Miroslav Genov

Still encountering the same problem in the last 4-5 days. I don't know 
whether this is connected with the last datastore outage, but it's 
really annoying that I must wait 15 minutes to upload a new version.


40% Uploading 0 files.
52% Initializing precompilation...
90% Deploying new version.
95% Will check again in 1 seconds
98% Will check again in 2 seconds
99% Will check again in 4 seconds
99% Will check again in 8 seconds
99% Will check again in 16 seconds
99% Will check again in 32 seconds
99% Will check again in 64 seconds
99% Will check again in 128 seconds
99% Rolling back the update.

Regards,
  Miroslav

On 06/02/2010 10:53 PM, Miroslav Genov wrote:
Today all day I get the same error when trying to upload an updated 
version of my application. I try to remove one existing version 
(currently I have 5 version of my app) but the administrative panel is 
failing with the following error:  A server error has occurred..


Any idea what is causing it ?


Also I wanna mention that the upload of my application is really slow 
and I have to wait several minutes to upload only 1 file change.


Regards,
  Miroslav

On 05/06/2010 03:20 PM, Tim Yates wrote:

Hiya!  For the past 3 hours, been trying to update my app engine java
instance, but have been getting the error:

Error posting to 
URL:https://appengine.google.com/api/appversion/deploy?app_id=check-emailversion=1;
403 Forbidden

Too Many Versions (403)
The application already has the maximum number of versions.

I see on the system status that things are under investigation

http://code.google.com/status/appengine/

Is this one of the things being investigated?

Tim

PS:  I only have a single version deployed, and this version is set to
be the default

   




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[appengine-java] Re: Manually create entity table and add rows using the dashboard.

2010-06-11 Thread Vaclav Bartacek

Try Extended GQL parser and simple 'gqlext.jsp' tool -
http://code.google.com/p/audao/wiki/ExtendedGQLParser
You can execute INSERT, SELECT, UPDATE and DELETE commands. The full
documentation is at http://audao.spoledge.com/doc-gae-features.html#gqlext

Vaclav

On Jun 11, 6:02 am, mar_novice mariocape1...@gmail.com wrote:
 Is there a way to use the dashboard dataviewer to manually create an
 entity table and add entities in it?
 So far, what I know is I can add an entity in a given kind if there
 are already existing entities of that kind. What if I am about to add
 the very first entity of that kind?

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[appengine-java] Re: org.datanucleus.jdo.exceptions.ClassNotPersistenceCapableException:

2010-06-11 Thread Ian Marshall

Hi Paul,

Your second set of log entries shows the problem and your way out of
it.

The first set of log entries complains that your compiled classes may
not have been enhanced. The second set of log entries confirms this
since your enhancement process did not complete successfully due to
the unexpected RuntimeException.

I have never used the Eclipse plug-in (a shame, since I use NetBeans
now and there is no plug-in officially-supported by Google), but I see
that

The URL file:/D:/MasteringWave/Eclipse/WaveAssistant/war/WEB-INF/lib/
datanucleus-appengine-1.0.6.final.jar is already registered, and you
are trying to register an identical plugin located at URL file:/C:/
eclipse/plugins/com.google.appengine.eclipse.sdkbundle.
1.3.3_1.3.3.v20100423/appengine-java-sdk-1.3.3.1/lib/user/orm/
datanucleus-appengine-1.0.6.final.jar.

I'll let you chose which .jar file to drop, but you might find it
easier not to include the one that currently finds its way to your D:/
MasteringWave/Eclipse/WaveAssistant/war/WEB-INF/lib folder.

Regards,

Ian



On Jun 10, 10:18 am, paul pjorti...@gmail.com wrote:
 Hi,

 This is the first time that I have worked with Datastore, I followed
 the tutorial 
 herehttp://code.google.com/appengine/docs/java/datastore/usingjdo.html,
 but whenever I run the project I got this error:

 org.datanucleus.jdo.exceptions.ClassNotPersistenceCapableException:
 The class The class my class is not persistable. This means that it
 either hasnt been enhanced, or that the enhanced version of the file
 is not in the CLASSPATH (or is hidden by an unenhanced version), or
 the Meta-Data/annotations for the class are not found. is not
 persistable. This means that it either hasnt been enhanced, or that
 the enhanced version of the file is not in the CLASSPATH (or is hidden
 by an unenhanced version), or the Meta-Data for the class is not
 found.
 Error on MailHandler
         at
 org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:
 241)
         at
 org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:
 674)
         at
 org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:
 694)
         at com.waveassistant.app.MailHandler.doPost(MailHandler.java:82)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
 ...

 Also, I tried to clean/build the project, just maybe there is a
 problem on the logs. So I got this error also:

 java.lang.RuntimeException: Unexpected exception
         at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:
 59)
         at com.google.appengine.tools.enhancer.Enhance.init(Enhance.java:
 60)
         at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:41)
 Caused by: java.lang.reflect.InvocationTargetException
         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 com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:
 57)
         ... 2 more
 Caused by: org.datanucleus.exceptions.NucleusException: Plugin
 (Bundle) org.datanucleus.store.appengine is already registered.
 Ensure you dont have multiple JAR versions of the same plugin in the
 classpath. The URL file:/D:/MasteringWave/Eclipse/WaveAssistant/war/
 WEB-INF/lib/datanucleus-appengine-1.0.6.final.jar is already
 registered, and you are trying to register an identical plugin located
 at URL file:/C:/eclipse/plugins/
 com.google.appengine.eclipse.sdkbundle.1.3.3_1.3.3.v20100423/
 appengine-java-sdk-1.3.3.1/lib/user/orm/datanucleus-
 appengine-1.0.6.final.jar.
         at
 org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:
 434)
         at
 org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:
 340)
         at
 org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensions(NonManagedPluginRegistry.java:
 222)
         at
 org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensionPoints(NonManagedPluginRegistry.java:
 153)
         at
 org.datanucleus.plugin.PluginManager.registerExtensionPoints(PluginManager.java:
 82)
         at org.datanucleus.OMFContext.init(OMFContext.java:160)
         at
 org.datanucleus.enhancer.DataNucleusEnhancer.init(DataNucleusEnhancer.java:
 172)
         at
 org.datanucleus.enhancer.DataNucleusEnhancer.init(DataNucleusEnhancer.java:
 150)
         at
 org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:
 1157)
         ... 7 more

 Please Advise.

 Thanks in advance,
 Paul

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Re: [appengine-java] GUICE injection and access denied (java.lang.RuntimePermission modifyThreadGroup)

2010-06-11 Thread Kasper Hansen

It seems to do no difference if I add the @Singleton to PostalManager or not.

Also, I've tried both;

public class MyModule extends AbstractModule {
@Override
protected void configure() {
}
}

and

public class MyModule extends AbstractModule {
@Override
protected void configure() {
bind(PostalManager.class).asEagerSingleton();
}
}

Any other ideas as to why I get the exception ?

Thanks.

On Fri, Jun 11, 2010 at 10:10 AM, RAVINDER MAAN rsmaan...@gmail.com wrote:
 have u declared PostalManager as @Singleton.

 On Fri, Jun 11, 2010 at 12:42 PM, KasperDK kbhdk1...@gmail.com wrote:

 Hi,

 I'm trying to do this;

 public class PostalServiceImpl extends RemoteServiceServlet implements
 PostalService {
        private static final Logger log =
 Logger.getLogger(PostalServiceImpl.class.getName());

       �...@inject
        private PostalManager postalManager;

        public PostalServiceImpl() {
                Injector injector = Guice.createInjector(new
 NetGazelleModule());

                injector.injectMembers(this);
        }

        public String getCity(String postal) {
                log.info(PostalServiceImpl.getCity( + postal + ));

                if (postalManager == null) {
                        log.severe(PostalServiceImpl.getCity:
 postalManager is null !);
                }

                return postalManager.getCity(postal);
        }

 ...


 But I get the following exception;

 INFO: The server is running at http://localhost:/
 Jun 11, 2010 6:38:57 AM
 com.google.inject.internal.FinalizableReferenceQueue init
 INFO: Failed to start reference finalizer thread. Reference cleanup
 will only occur when new references are created.
 java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
 39)
        at

 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
 25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at

 com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
 100)
        at

 com.google.inject.internal.FinalizableReferenceQueue.init(FinalizableReferenceQueue.java:
 124)
        at com.google.inject.internal.MapMaker
 $QueueHolder.clinit(MapMaker.java:787)
        at
 com.google.inject.internal.MapMaker$WeakEntry.init(MapMaker.java:
 946)
        at com.google.inject.internal.MapMaker$Strength
 $1.newEntry(MapMaker.java:312)
        at com.google.inject.internal.MapMaker
 $StrategyImpl.newEntry(MapMaker.java:498)
        at com.google.inject.internal.MapMaker
 $StrategyImpl.newEntry(MapMaker.java:419)
        at com.google.inject.internal.CustomConcurrentHashMap
 $ComputingImpl.get(CustomConcurrentHashMap.java:2029)
        at
 com.google.inject.internal.BytecodeGen.getClassLoader(BytecodeGen.java:
 149)
        at
 com.google.inject.internal.BytecodeGen.getClassLoader(BytecodeGen.java:
 132)
        at
 com.google.inject.internal.BytecodeGen.newFastClass(BytecodeGen.java:
 162)
        at com.google.inject.DefaultConstructionProxyFactory
 $1.init(DefaultConstructionProxyFactory.java:54)
        at

 com.google.inject.DefaultConstructionProxyFactory.create(DefaultConstructionProxyFactory.java:
 52)
        at com.google.inject.ProxyFactory.create(ProxyFactory.java:152)
        at

 com.google.inject.ConstructorInjectorStore.createConstructor(ConstructorInjectorStore.java:
 84)
        at com.google.inject.ConstructorInjectorStore.access
 $000(ConstructorInjectorStore.java:31)
        at com.google.inject.ConstructorInjectorStore
 $1.create(ConstructorInjectorStore.java:39)
        at com.google.inject.ConstructorInjectorStore
 $1.create(ConstructorInjectorStore.java:35)
        at com.google.inject.internal.FailableCache
 $1.apply(FailableCache.java:35)
        at com.google.inject.internal.MapMaker
 $StrategyImpl.compute(MapMaker.java:549)
        at com.google.inject.internal.MapMaker
 $StrategyImpl.compute(MapMaker.java:419)
        at com.google.inject.internal.CustomConcurrentHashMap
 $ComputingImpl.get(CustomConcurrentHashMap.java:2041)
        at com.google.inject.internal.FailableCache.get(FailableCache.java:
 46)
        at

 com.google.inject.ConstructorInjectorStore.get(ConstructorInjectorStore.java:
 52)
        at

 com.google.inject.ConstructorBindingImpl.initialize(ConstructorBindingImpl.java:
 57)
        at
 com.google.inject.InjectorImpl.initializeBinding(InjectorImpl.java:
 377)
        at
 com.google.inject.BindingProcessor$1$1.run(BindingProcessor.java:
 169)
        at

 com.google.inject.BindingProcessor.initializeBindings(BindingProcessor.java:
 224)
        at

 com.google.inject.InjectorBuilder.initializeStatically(InjectorBuilder.java:
 120)
        at
 com.google.inject.InjectorBuilder.build(InjectorBuilder.java:105)
        at

[appengine-java] Records Count

2010-06-11 Thread RAVINDER MAAN

How can we get records count for a query in JDO.
In sql we have select count(*) from table_name
i want to get number of records returned by a query. what is the
efficient way to do that.One option is to use size() function .I think
it is not best way.

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Re: [appengine-java] Re: JDO - Deleted data reappears

2010-06-11 Thread Andrew Myers

Hi Ian,

Thanks for your reply. I expect I only had the server running for a
minute or so at the time so that could well explain it.

I have not seen it happen again today so I will assume this is the
case and keep pushing ahead with what i'm doing.

Regards,
Andrew

On 11/06/2010, at 6:30 PM, Ian Marshall ianmarshall...@gmail.com
wrote:

Hi Andrew,

Without looking at your code, how long elapses between deleting your
items using your web application and stopping your development server?

I have found that writes to my local GAE/J datastore can take up to 1
minute to be written to the relevant file on my local file system
(which the dev app server uses as its persistent datastore). I always
wait around two minutes after the last update to this file before
stopping my dev app server.

Regards,

Ian

On Jun 10, 7:38 am, Andrew am2...@gmail.com wrote:

Hi,

I'm in the very early stages of building an app with GAE and am
trying

to do my first CRUD process.

Unfortunately I've run into a problem where when I delete items they
seem to disappear during the current session in development, but when
I stop and restart the development server they reappear.

I've pasted my DAO code here if anyone is able to give me some advice
on what I may have done wrong:

http://java.pastebin.com/Jr23cMTc

Best regards,
Andrew.

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[appengine-java] Re: Disable URLFetchService cache

2010-06-11 Thread mar_novice

Ooopppss.. my mistake, im looking at an old version of my app. I think
setting the headers with no-cache is enough and no need for the
timestamp.

On Jun 11, 6:27 pm, mar_novice mariocape1...@gmail.com wrote:
      Unfortunately, even using

 URL urlObj = new URL(url);
 HttpURLConnection connection = (HttpURLConnection)
 urlObj.openConnection();
 connection.addRequestProperty(Cache-Control, no-cache,max-age=0);
 connection.addRequestProperty(Pragma, no-cache);

 sometimes give me cached results. I'll try combining the two
 suggestions.

 On Jun 11, 9:48 am, mar_novice mariocape1...@gmail.com wrote:



        How quickly? Not that fast. I'm still testing my app and upon
  refreshing the page, sometimes what I get are the cached results. I
  even get sometimes the result that was supposed to be yesterday's
  result, meaning, a day old result. Can you somehow explain how the
  urlfetchservice cache works so that we can somehow avoid getting
  unexpected results from it. And I thought urlfetch does not do caching
  but it does. It seems that it is not in the documentation or I just
  missed it.

        Adding a timestamp seems a good workaround.

  On Jun 11, 3:01 am, Ikai L (Google) ika...@google.com wrote:

   How quickly are you making requests?

   One thing to try - I can't guarantee it'll work - is to append a timestamp
   parameters to the URL like this:http://www.somedomain.com?v=sometimestamp.
   You'll have to balance this against your latency requirements, as the 
   cache
   is several orders of magnitude faster.

   On Wed, Jun 9, 2010 at 5:29 AM, mar_novice mariocape1...@gmail.com 
   wrote:
Is there a way to disable urlfetchService cache? When I made a
urlfetch, sometimes, what I get is the cached result.

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[appengine-java] Re: Records Count

2010-06-11 Thread Ravi

Google app engine designed to work for any numbers of records with in
minimum time, so SQL features like counting the records whenever
needed is not supported.
So you need to take care of such counter by urself at the time of
adding or deleting the records in a table/entity.

If you just want total number of records and dont care if counting
happened in last 24 hours then look into low level api for datastore
statistics, GAE refreshes total count every 24 hours and you can read
the total count from there.

And if you want count of records with some where clause, then you need
to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

then you may need to create a new entity say counterForTb, and have
few fields entityName and count and where clause columns
and whenevr you add a new record in tb then increase the count of that
record in counter table and on delete decrease it.




Something for google guys
Just realized that all columns are indexed unless we specify to not to
index, and there must be some index meta data/statistics saved
somewhere in google data stores about index(like total records
matching to this index). And if that stats can be accessible through
some APIs then we may be able to get total count just by reading data
from indexes stats.
Is this something feasible?








On Jun 11, 11:39 am, RAVINDER MAAN rsmaan...@gmail.com wrote:
 How can we get records count for a query in JDO.
 In sql we have select count(*) from table_name
 i want to get number of records returned by a query. what is the
 efficient way to do that.One option is to use size() function .I think
 it is not best way.

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[appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread Mark

Hi, just joining in, trying to sum up:

In the best case (if we only use the low level datastore + no
frameworks on top) we can only hope that a fresh restart of our app
will take 4.5 seconds?

However if at least one user is hitting the site every 60 seconds from
somewhere in the world, then our app should be kept alive and no need
for restarts?

Not that I'm planning on doing it, but what prevents developers from
simply pinging the site every 60 seconds to force the app to stay in
memory? I ask what prevents it because if I play by the rules, I'm
going to get penalized if other developers are 'cheating' and doing
the artificial pinging,

Thanks

On Jun 9, 5:49 am, Jake jbrooko...@cast.org wrote:
 Hey Tin,

 Several people were using GAE's built in timing mechanism to ping the
 server to accomplish the same thing.  Google came out and officially
 discouraged this as it tends to throw off any attempts they are
 currently making to fix the problem.  I can't tell people what to do,
 but I opted to stop using this hack in the hopes that they will solve
 the problem.

 Besides, you'll notice that this hack doesn't really work over the
 long run.  It will essentially restart your server every minute and
 won't really prevent the loading request from falling on your users
 instead of on your ping.

 Jake

 On Jun 8, 1:54 pm, Tin tin.c...@gmail.com wrote:



  Hi all:

  We have found a temporary solution for this issue:
  Try with an AJAX timer kicking the server (doing nothing), maybe one
  request per minute (or less) and GAE will keep our site / users in the
  same node.
  In our testing it could avoid the GAE web instance reloaded, but if
  the request interval is long, it would cause another Datastore
  performance issue:http://goo.gl/98zkthatwill be fixed in near
  future.

  More info please refer to here:http://goo.gl/mzQR

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[appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread Thomas

Hi Mark:

   The 4.5 seconds is for struts 1.2 in my case. The startup time of
1.3~3.9 seconds is reported by using a more lightweight framework
(slim3). Please refer to 
http://groups.google.com/group/slim3-user/browse_thread/thread/e9d2f7a52f3408

On 6月11日, 下午7時32分, Mark mar...@gmail.com wrote:
 Hi, just joining in, trying to sum up:

 In the best case (if we only use the low level datastore + no
 frameworks on top) we can only hope that a fresh restart of our app
 will take 4.5 seconds?

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Re: [appengine-java] Re: Records Count

2010-06-11 Thread RAVINDER MAAN

Thanks for your reply Ravi
let me explain the entire scenario.I have an employee entity .User can
search employees by giving part of name .There are four type of employees .I
have to show number of employees matching user search criteria for every
type of employee under different tabs.Actual results are to be displayed
only if user open that tab.
In SQL term we could write following query

Select count(*) from employee where name like '%searchname%' and type ='A'
;

My first problem is that i dint find any equivalent of like operator.Is
there any way to do it?
Secondly we can not keep record count for each search combination.what will
you suggest for this case?
Thanks once again.

On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:

Google app engine designed to work for any numbers of records with in
minimum time, so SQL features like counting the records whenever
needed is not supported.
So you need to take care of such counter by urself at the time of
adding or deleting the records in a table/entity.

If you just want total number of records and dont care if counting
happened in last 24 hours then look into low level api for datastore
statistics, GAE refreshes total count every 24 hours and you can read
the total count from there.

And if you want count of records with some where clause, then you need
to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

then you may need to create a new entity say counterForTb, and have
few fields entityName and count and where clause columns
and whenevr you add a new record in tb then increase the count of that
record in counter table and on delete decrease it.

Something for google guys
Just realized that all columns are indexed unless we specify to not to
index, and there must be some index meta data/statistics saved
somewhere in google data stores about index(like total records
matching to this index). And if that stats can be accessible through
some APIs then we may be able to get total count just by reading data
from indexes stats.
Is this something feasible?

On Jun 11, 11:39 am, RAVINDER MAAN rsmaan...@gmail.com wrote:
How can we get records count for a query in JDO.
In sql we have select count(*) from table_name
i want to get number of records returned by a query. what is the
efficient way to do that.One option is to use size() function .I think
it is not best way.

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[appengine-java] Re: App Engine Scalability

2010-06-11 Thread David Sowerby

This is relevant too

http://code.google.com/p/googleappengine/issues/detail?id=2456

On Jun 10, 11:31 pm, Thomas mylee...@gmail.com wrote:
 Hi:

     Please 
 seehttp://groups.google.com/group/google-appengine-java/browse_thread/th...
 for more detail.

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[appengine-java] Re: MD5 Hash

2010-06-11 Thread Jake

Hey,

Nothing additional on the build path.  I am using Enterprise Edition
of Java.  I'm pretty sure the security package falls under Standard
Edition, but meh.  Who knows?

Jake

On Jun 10, 4:59 pm, Michael mrher...@gmail.com wrote:
 I am using eclipse, do I need to add it to my build path?  I don't
 think I need to since it is not an external library?

 I'll play around with it some more. Hopfully I can find something.

 Michael

 On Jun 10, 3:35 pm, Jake jbrooko...@cast.org wrote:

  Hey,

  The method below works fine for me.  No extra dependencies.  Just
  worked.  So, not at all helpful other than perhaps something wonky
  with your java install?

  Jake

  import java.security.MessageDigest;

  private static String md5Hex (String email) {
          try {
                  MessageDigest md = MessageDigest.getInstance(MD5);
                  // more stuff
          } catch (Exception ex) {
                  /* No Action */
          }

  }

  On Jun 10, 2:42 pm, Michael mrher...@gmail.com wrote:

   Any ideas on what is wrong then?

   On Jun 10, 1:03 pm, Nacho Coloma icol...@gmail.com wrote:

That should not be your 
problem:http://code.google.com/appengine/docs/java/jrewhitelist.html

I am using MD5 in AppEngine without issues.

On Jun 10, 3:17 pm, Michael mrher...@gmail.com wrote:

 Hi,

 I am pretty new to app engine (and Java) and I am seem to have run in
 to a wall.  I want to do an MD5 hash and I was trying to use the
 java.security package, but I get:
  [ERROR] Line 3: The import java.security cannot be resolved

 I am thinking that it is because app engine can't use java.security?

 Here is the MD5 code I have

 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 ...
 try {
 MessageDigest digest = java.security.MessageDigest.getInstance(MD5);
 digest.update(test.getBytes());
 PW = digest.digest().toString();

 } catch (NoSuchAlgorithmException e) {
 }

 Am I doing something wrong, or is there a different way to get a MD5
 hash?  I also need to do the same thing client side using GWT if their
 is any advice for that too.

 Thanks
 Michael

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Re: [appengine-java] Re: Records Count

2010-06-11 Thread John Patterson

A lot depends on how many Employee entities you have.

You could do a sub search for each of the 4 employee types and use
COUNT to get the results. This will only work up to 1000 employees
per employee type.

Twig can execute queries in parallel so this would take no more time
than running your original query.

On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

Thanks for your reply Ravi
let me explain the entire scenario.I have an employee
entity .User can search employees by giving part of name .There are
four type of employees .I have to show number of employees matching
user search criteria for every type of employee under different
tabs.Actual results are to be displayed only if user open that tab.

In SQL term we could write following query

Select count(*) from employee where name like '%searchname%' and
type ='A' ;

My first problem is that i dint find any equivalent of like
operator.Is there any way to do it?
Secondly we can not keep record count for each search
combination.what will you suggest for this case?

Thanks once again.

On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:
Google app engine designed to work for any numbers of records with in
minimum time, so SQL features like counting the records whenever
needed is not supported.
So you need to take care of such counter by urself at the time of
adding or deleting the records in a table/entity.

And if you want count of records with some where clause, then you need
to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

it is not best way.

--
Regards,
Ravinder Singh Maan

Re: [appengine-java] Re: Records Count

2010-06-11 Thread RAVINDER MAAN

number of employee entities is going to be high .So i guess that possibility
of getting more then 1000 employees for any search is quite high.

On Fri, Jun 11, 2010 at 6:56 PM, John Patterson jdpatter...@gmail.comwrote:

A lot depends on how many Employee entities you have.

You could do a sub search for each of the 4 employee types and use COUNT to
get the results. This will only work up to 1000 employees per employee
type.

Twig can execute queries in parallel so this would take no more time than
running your original query.

On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

Select count(*) from employee where name like '%searchname%' and type
='A' ;

On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:

And if you want count of records with some where clause, then you need
to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

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[appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread dflorey

It would be great if JPA/JDO could be disabled in the Google eclipse
plugin.
I don't need it, but I've not yet figured out how to get rid of the
jars...

On 7 Jun., 17:59, Jake jbrooko...@cast.org wrote:
 Hi all,

 @Thomas:  I will look into that, thank you.  The way we generate our
 pages in this framework, however, involves some interesting dynamic
 generation of image URLs that are mounted within the application
 itself.  It ends up being a bit more complicated than just displaying
 one string or another for the src attribute.  Whether this is a good
 practice on GAE is certainly up for debate, but I presume this
 wouldn't help the frequent restart issue, correct?  It just means that
 fewer files would be able to trigger a restart?

 @Tin:  I'm not sure I understand what I will learn from this.  From
 what I understand, contextDestroyed() is never called so all I would
 see is an additional log statement near GAE's loading request logging
 line?  I've never used a ServletContextListener, so perhaps it has
 other features that I'm not aware of?

 Thanks!

 Jake

 On Jun 7, 11:41 am, Tin tin.c...@gmail.com wrote:



  Hi Jack:

  I suggest that maybe you can write a ServletContextListener to monitor
  the web instance reloading issue, for our testing we just put a info
  logging in the contextInitialized(..) method:

  public void contextInitialized(ServletContextEvent evt) {
    log.info(Web context inited.);

  }

  And modify the DEFAULT logging level to INFO in the logging.properties
  file. If the web instance was reloaded, we could trace this in the
  logging messages.

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[appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread Jake

Hi Mark,

Yes, you can do better than 4.5 seconds without a framework.  Also,
there are layers that can be placed over the low level datastore (e.g
Objectify) that add ease-of-use without noticeable additions to the
startup time.

The 60 second pinging thing is, indeed, done by some users and is
officially discouraged by Google.  At one point, I set up a similar
pinging feature and found that it really didn't work.  Theoretically
it should, but the pings just caused loading requests every minute or
so, which simply reduced the likelihood that a user would see the
loading request; it didn't solve the problem.

Jake


On Jun 11, 7:32 am, Mark mar...@gmail.com wrote:
 Hi, just joining in, trying to sum up:

 In the best case (if we only use the low level datastore + no
 frameworks on top) we can only hope that a fresh restart of our app
 will take 4.5 seconds?

 However if at least one user is hitting the site every 60 seconds from
 somewhere in the world, then our app should be kept alive and no need
 for restarts?

 Not that I'm planning on doing it, but what prevents developers from
 simply pinging the site every 60 seconds to force the app to stay in
 memory? I ask what prevents it because if I play by the rules, I'm
 going to get penalized if other developers are 'cheating' and doing
 the artificial pinging,

 Thanks

 On Jun 9, 5:49 am, Jake jbrooko...@cast.org wrote:

  Hey Tin,

  Several people were using GAE's built in timing mechanism to ping the
  server to accomplish the same thing.  Google came out and officially
  discouraged this as it tends to throw off any attempts they are
  currently making to fix the problem.  I can't tell people what to do,
  but I opted to stop using this hack in the hopes that they will solve
  the problem.

  Besides, you'll notice that this hack doesn't really work over the
  long run.  It will essentially restart your server every minute and
  won't really prevent the loading request from falling on your users
  instead of on your ping.

  Jake

  On Jun 8, 1:54 pm, Tin tin.c...@gmail.com wrote:

   Hi all:

   We have found a temporary solution for this issue:
   Try with an AJAX timer kicking the server (doing nothing), maybe one
   request per minute (or less) and GAE will keep our site / users in the
   same node.
   In our testing it could avoid the GAE web instance reloaded, but if
   the request interval is long, it would cause another Datastore
   performance issue:http://goo.gl/98zkthatwillbe fixed in near
   future.

   More info please refer to here:http://goo.gl/mzQR

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[appengine-java] Re: Can't delete blobs via Google's admin UI

2010-06-11 Thread Alexander Orlov

Does anybody else has the same problem?

An answer to this question would help me a lot.

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[appengine-java] Re: Records Count

2010-06-11 Thread Ravi

Have u solved the problem of like SQL? If yes then please share with
me as i have not been able to solve it.

On Jun 11, 2:53 pm, RAVINDER MAAN rsmaan...@gmail.com wrote:
 number of employee entities is going to be high .So i guess that possibility
 of getting more then 1000 employees for any search is quite high.

 On Fri, Jun 11, 2010 at 6:56 PM, John Patterson jdpatter...@gmail.comwrote:





  A lot depends on how many Employee entities you have.

  You could do a sub search for each of the 4 employee types and use COUNT to
  get the results.  This will only work up to 1000 employees per employee
  type.

  Twig can execute queries in parallel so this would take no more time than
  running your original query.

  On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

  Thanks for your reply Ravi
     let me explain the entire scenario.I have an employee entity .User can
  search employees by giving part of name .There are four type of employees .I
  have to show number of employees matching user search criteria for every
  type of employee under different tabs.Actual results are to be displayed
  only if user open that tab.
  In SQL term we could write following query

  Select count(*) from employee where name like '%searchname%' and type
  ='A' ;

  My first problem is that i dint find any equivalent of like operator.Is
  there any way to do it?
  Secondly we can not keep record count for each search combination.what will
  you suggest for this case?
  Thanks once again.

  On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:

  Google app engine designed to work for any numbers of records with in
  minimum time, so SQL features like counting the records whenever
  needed is not supported.
  So you need to take care of such counter by urself at the time of
  adding or deleting the records in a table/entity.

  If you just want total number of records and dont care if counting
  happened in last 24 hours then look into low level api for datastore
  statistics, GAE refreshes total count every 24 hours and you can read
  the total count from there.

  And if you want count of records with some where clause, then you need
  to maintain it.

  like if u want like this
  select count(0) from tb where tb.propA='someValue'

  then you may need to create a new entity say counterForTb, and have
  few fields entityName and count and where clause columns
  and whenevr you add a new record in tb then increase the count of that
  record in counter table and on delete decrease it.

  Something for google guys
  Just realized that all columns are indexed unless we specify to not to
  index, and there must be some index meta data/statistics saved
  somewhere in google data stores about index(like total records
  matching to this index). And if that stats can be accessible through
  some APIs then we may be able to get total count just by reading data
  from indexes stats.
  Is this something feasible?

  On Jun 11, 11:39 am, RAVINDER MAAN rsmaan...@gmail.com wrote:
   How can we get records count for a query in JDO.
   In sql we have select count(*) from table_name
   i want to get number of records returned by a query. what is the
   efficient way to do that.One option is to use size() function .I think
   it is not best way.

  --
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Re: [appengine-java] Re: Records Count

2010-06-11 Thread RAVINDER MAAN

No Ravi I did not find any solution yet.Neither for like nor for count.Its
such a basic thing it think there must be a way.I dont see any reply from
google people too.

On Fri, Jun 11, 2010 at 8:12 PM, Ravi ping2r...@gmail.com wrote:

Have u solved the problem of like SQL? If yes then please share with
me as i have not been able to solve it.

On Jun 11, 2:53 pm, RAVINDER MAAN rsmaan...@gmail.com wrote:
number of employee entities is going to be high .So i guess that
possibility
of getting more then 1000 employees for any search is quite high.

On Fri, Jun 11, 2010 at 6:56 PM, John Patterson jdpatter...@gmail.com
wrote:

A lot depends on how many Employee entities you have.

You could do a sub search for each of the 4 employee types and use
COUNT to
get the results. This will only work up to 1000 employees per employee
type.

Twig can execute queries in parallel so this would take no more time
than
running your original query.

On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

Thanks for your reply Ravi
let me explain the entire scenario.I have an employee entity .User
can
search employees by giving part of name .There are four type of
employees .I
have to show number of employees matching user search criteria for
every
type of employee under different tabs.Actual results are to be
displayed
only if user open that tab.
In SQL term we could write following query

Select count(*) from employee where name like '%searchname%' and type
='A' ;

My first problem is that i dint find any equivalent of like operator.Is
there any way to do it?
Secondly we can not keep record count for each search combination.what
will
you suggest for this case?
Thanks once again.

On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:

And if you want count of records with some where clause, then you need
to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

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[appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread Rahul

Jake,

Is there any official comments on this from google which says that it
discourage the pinging every 60 seconds or so.

Also if we have some framework which we will always like to have if
doing some production application then what is the way out.

Thanks,
Rahul

On Jun 11, 10:16 am, Jake jbrooko...@cast.org wrote:
 Hi Mark,

 Yes, you can do better than 4.5 seconds without a framework.  Also,
 there are layers that can be placed over the low level datastore (e.g
 Objectify) that add ease-of-use without noticeable additions to the
 startup time.

 The 60 second pinging thing is, indeed, done by some users and is
 officially discouraged by Google.  At one point, I set up a similar
 pinging feature and found that it really didn't work.  Theoretically
 it should, but the pings just caused loading requests every minute or
 so, which simply reduced the likelihood that a user would see the
 loading request; it didn't solve the problem.

 Jake

 On Jun 11, 7:32 am, Mark mar...@gmail.com wrote:



  Hi, just joining in, trying to sum up:

  In the best case (if we only use the low level datastore + no
  frameworks on top) we can only hope that a fresh restart of our app
  will take 4.5 seconds?

  However if at least one user is hitting the site every 60 seconds from
  somewhere in the world, then our app should be kept alive and no need
  for restarts?

  Not that I'm planning on doing it, but what prevents developers from
  simply pinging the site every 60 seconds to force the app to stay in
  memory? I ask what prevents it because if I play by the rules, I'm
  going to get penalized if other developers are 'cheating' and doing
  the artificial pinging,

  Thanks

  On Jun 9, 5:49 am, Jake jbrooko...@cast.org wrote:

   Hey Tin,

   Several people were using GAE's built in timing mechanism to ping the
   server to accomplish the same thing.  Google came out and officially
   discouraged this as it tends to throw off any attempts they are
   currently making to fix the problem.  I can't tell people what to do,
   but I opted to stop using this hack in the hopes that they will solve
   the problem.

   Besides, you'll notice that this hack doesn't really work over the
   long run.  It will essentially restart your server every minute and
   won't really prevent the loading request from falling on your users
   instead of on your ping.

   Jake

   On Jun 8, 1:54 pm, Tin tin.c...@gmail.com wrote:

Hi all:

We have found a temporary solution for this issue:
Try with an AJAX timer kicking the server (doing nothing), maybe one
request per minute (or less) and GAE will keep our site / users in the
same node.
In our testing it could avoid the GAE web instance reloaded, but if
the request interval is long, it would cause another Datastore
performance issue:http://goo.gl/98zkthatwillbefixed in near
future.

More info please refer to here:http://goo.gl/mzQR

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[appengine-java] Re: Session object or memcache?

2010-06-11 Thread Rahul

No doubt if your application is low traffic you will definitely need
memcache as session will be lost every minute when the jvm restarts
and you need to reload everything and also session is highly
discouraged due to various reasons.

Thanks,
Rahul

On Jun 11, 4:16 am, RAVINDER MAAN rsmaan...@gmail.com wrote:
 Hello all
       what is the best option from performance point of view, storing
 frequently used objects in session or loading from datastore for every
 request(we can add memcache support before trying to fetch from
 datastore).Can anybody tell me good link to develop high performance
 and fast application development best practices link.I am using java
 with JDO.
  thanks in advance.

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Re: [appengine-java] Re: Session object or memcache?

2010-06-11 Thread RAVINDER MAAN

I was not aware about loss of session objects.strange!!

On Fri, Jun 11, 2010 at 8:39 PM, Rahul rahul.jun...@gmail.com wrote:

No doubt if your application is low traffic you will definitely need
memcache as session will be lost every minute when the jvm restarts
and you need to reload everything and also session is highly
discouraged due to various reasons.

Thanks,
Rahul

On Jun 11, 4:16 am, RAVINDER MAAN rsmaan...@gmail.com wrote:
Hello all
what is the best option from performance point of view, storing
frequently used objects in session or loading from datastore for every
request(we can add memcache support before trying to fetch from
datastore).Can anybody tell me good link to develop high performance
and fast application development best practices link.I am using java
with JDO.
thanks in advance.

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Re: [appengine-java] Re: Records Count

2010-06-11 Thread John Patterson

The best you could probably do is load into memory a structure that
keeps the employee type for every employee. When the user types some
letters of a name to search for you can perform a keys-only query and
lookup the employee type in this structure (rather than load the entity)

You would need 2 bits per employee (for 4 types) so even a million
employees would only require 250KB of memory (an array of 30K longs)
which shouldn't take too long to read from memcache when an instance
starts.

You would then need to iterate over every result and count which type
the employee is. To optimise this you might cache the counts in
memcache of 1 and 2 letter searches. So then you would only need to
count on the fly three letter searches i.e. all employees with names
starting with smi

On 11 Jun 2010, at 20:53, RAVINDER MAAN wrote:

number of employee entities is going to be high .So i guess that
possibility of getting more then 1000 employees for any search is
quite high.

On Fri, Jun 11, 2010 at 6:56 PM, John Patterson
jdpatter...@gmail.com wrote:

A lot depends on how many Employee entities you have.

You could do a sub search for each of the 4 employee types and use
COUNT to get the results. This will only work up to 1000 employees
per employee type.

Twig can execute queries in parallel so this would take no more time
than running your original query.

On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

Thanks for your reply Ravi
let me explain the entire scenario.I have an employee
entity .User can search employees by giving part of name .There are
four type of employees .I have to show number of employees matching
user search criteria for every type of employee under different
tabs.Actual results are to be displayed only if user open that tab.

In SQL term we could write following query

Select count(*) from employee where name like '%searchname%' and
type ='A' ;

My first problem is that i dint find any equivalent of like
operator.Is there any way to do it?
Secondly we can not keep record count for each search
combination.what will you suggest for this case?

Thanks once again.

And if you want count of records with some where clause, then you
need

to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

then you may need to create a new entity say counterForTb, and have
few fields entityName and count and where clause columns
and whenevr you add a new record in tb then increase the count of
that

record in counter table and on delete decrease it.

Something for google guys
Just realized that all columns are indexed unless we specify to not
to

index, and there must be some index meta data/statistics saved
somewhere in google data stores about index(like total records
matching to this index). And if that stats can be accessible through
some APIs then we may be able to get total count just by reading data
from indexes stats.
Is this something feasible?

it is not best way.

--
Regards,
Ravinder Singh Maan

[appengine-java] Re: update_indexes error

2010-06-11 Thread keyurva

Can someone on the app engine team help me out?

Thanks,
Keyur

On Jun 10, 5:45 pm, keyurva keyu...@gmail.com wrote:
 I have a Java app deployed on app engine and I use appcfg.py of the
 Python SDK to vacuum and update my indexes.

 Today I first ran vacuum_indexes and that completed successfully -
 i.e. it en-queued tasks to delete my existing indexes.

 The next step was probably a mistake on my part - I then ran
 update_indexes even though my previous indexes weren't yet deleted.
 Needless to say that my update_indexes call errored out. So much so
 that now when I look at my app engine console, it shows the status of
 all my indexes as Error.

 Can someone help my out of my fix?!

 Thanks,
 Keyur

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

2010-06-11 Thread jarent

I was able to run drools (http://www.jboss.org/drools) on GAE.
Required libraries, that works fine:

* drools-api-5.0.1.jar
* drools-compiler-5.0.1.jar
* antlr.jar
* antlr-runtime-3.1.1.jar


Problemtic ones:
* mvel2-2.0.18.jar - At least this version is required, older ones
have compatibility issues with GAE
* core-3.4.2.v_883_R34x-unsigned.jar  - All official distributions are
signed. Unfortunatelly, eclipse certificate causes some problems on
GAE. I had to unsign this jar manually in order to use them on GAE.
* drools-core-5.0.1.jar - There are two uncompatible classes in this
library:
org.drools.util.ChainedProperties: it contains
'ClassLoader.getSystemClassLoader()', which is illegal code on GAE. It
is enough to comment all those invocation - they are unneeded.
org.drools.util.asm.ClassFieldInspector: calling method 'private
String getResourcePath(final Class ?  clazz)' ends up with hard to
track StackOverflowError. To fix it you have to change body of this
method to 'return / + clazz.getCanonicalName().replace(., /) +
.class;'. Replacing all '.' with '/' in class names solves
everything!
I modified those classes (if you need source code, just send me an e-
mail), put them into WEB-INF/classes (to be sure that my version will
be loaded before classes from drools-core-5.0.1.jar)

And that's all.

Let me know if you have some problems with this instruction

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[appengine-java] Unable to locate the JVM error on Eclipse Galileo on Snow Leopard

2010-06-11 Thread Venkat

Hello,

I'm getting Unable to locate the JVM when i try to create a demo
project.

My configuration details
- Mac OS X 10.6.3
- Eclipse Galileo
- java version 1.6.0_20
- javac 1.6.0_20

Thanks in advance for the help.

Cheers
/Ven

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[appengine-java] Task Queue

2010-06-11 Thread sathish

Hi i'm new to task queue API concept and its difficult for me to
understand the concept theoretically so plz send me one simple
complete Task queue program it helps me to understand it. Plz Help me.

Regards
Sathish

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[appengine-java] Re: Transaction exception when not using a transaction ?

2010-06-11 Thread linette

I have the same exception with my app.
Here is my code:

PersistenceManager pm = PMF.get().getPersistenceManager();
Query query = this.pm.newQuery(select key from  +
Subscription.class.getName()
+  where nextMail = :dateParam  status == 
:statusParam);
ListKey keys = (ListKey) query.execute(new Date(), 1);
for (Key key: keys) {
 Queue queue = QueueFactory.getDefaultQueue();
 TaskOptions task = url('handler');
 task.param('key', KeyFactory.keyToString(key));
 queue.add(task);
}
pm.close();


This throws the exception during pm.close() :

NestedThrowablesStackTrace:
java.lang.IllegalArgumentException: can't operate on multiple entity
groups in a single transaction.
at
com.google.appengine.api.datastore.DatastoreApiHelper.translateError(DatastoreApiHelper.java:
34)
at
com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall(DatastoreApiHelper.java:
67)
at com.google.appengine.api.datastore.DatastoreServiceImpl
$1.run(DatastoreServiceImpl.java:128)
at
com.google.appengine.api.datastore.TransactionRunner.runInTransaction(TransactionRunner.java:
30)
at
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:
111)
at
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:
84)
at
com.google.appengine.api.datastore.DatastoreServiceImpl.get(DatastoreServiceImpl.java:
72)
at
org.datanucleus.store.appengine.RuntimeExceptionWrappingDatastoreService.get(RuntimeExceptionWrappingDatastoreService.java:
63)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.get(DatastorePersistenceHandler.java:
96)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.get(DatastorePersistenceHandler.java:
106)
at
org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:
478)
at
org.datanucleus.state.JDOStateManagerImpl.loadUnloadedFieldsInFetchPlan(JDOStateManagerImpl.java:
1627)
at
org.datanucleus.state.JDOStateManagerImpl.detach(JDOStateManagerImpl.java:
3560)
at
org.datanucleus.ObjectManagerImpl.performDetachOnClose(ObjectManagerImpl.java:
3270)
at org.datanucleus.ObjectManagerImpl.close(ObjectManagerImpl.java:
807)
at
org.datanucleus.jdo.JDOPersistenceManager.close(JDOPersistenceManager.java:
271)


The only thing I can think of is that PMF.get() is being recycled from
a previous request, and somehow it is in a bad state. But the doc
clearly says that we should recycle this object. What is going on ?

On Jun 8, 9:05 am, JD liva...@gmail.com wrote:
 I am not using atransaction(see original POST), which is the
 problem.

 On Jun 4, 11:03 am, Chau Huynh cmhu...@gmail.com wrote:



  Did you have different entity groups inside atransaction?
  Google have a constraint of what can be done in 
  atransactionherehttp://code.google.com/appengine/docs/python/datastore/transactions.h...

  On Fri, Jun 4, 2010 at 5:45 PM, JD liva...@gmail.com wrote:
   After debugging, I was able to get rid of the exception by removing a
   pm.newQuery() which was happening on a different entity group.

   To me this is a bug in App Engine, as there is no reason the query on
   a particular entity group should fail outside atransaction.

   On Jun 3, 12:25 pm, Millisecond millisec...@gmail.com wrote:
Hmmm.

How is your object model structured?  Do entities have other entities
as direct references?

If you have class A { B b } and setting b to an instance of B that
already existed might throw the error you're seeing.

I changed my structure to be class A { String bKey } for a variety
of other reasons, but guess it also may have gotten around this
problem.

Alternatively, post as much code as you can and I'll see if anything
else rings a bell, early on I spent a frustrated day or two working
around this exception in a variety of places so know it can be
frustrating.

-C

On Jun 3, 6:33 am, JD liva...@gmail.com wrote:

 I added a call to flush() after every change on the PM-managed object,
 but that did not help.

 Also doing a pm.flush() does not throw this exception, but doing a
 pm.close() does - which seems to be contrary to your reasoning (I
 would expect flush to throw the same exception if multiple entity
 groups were at cause).

 On Jun 3, 1:33 am, Millisecond millisec...@gmail.com wrote:

  Even though you're not using transactions, I think it's trying to
   make
  the .close() call atomic (maybe with an internal implicit
 transaction), failing or succeeding as a whole.  And as I understand
  it, entities not in the same group can be stored on separate 
  machines
  so can't be operated on atomically.

  I've worked around this by calling a flush() after most any change 
  on
  a PM-managed object until close().  If this has a huge number of

[appengine-java] How can I acquire blobkeys by uploaded input(type:file multiple)

2010-06-11 Thread you hori

How can I acquire blobkeys by uploaded input(type:file multiple)


Hi.
I develop project by GAE/J(Eclipse3.5 + SDK1.3.3.1).
When describing it by the following sources, two or more files cannot
be acquired well.

JSP
body
%
BlobstoreService blobstoreService =
BlobstoreServiceFactory.getBlobstoreService();
%
form action=%= blobstoreService.createUploadUrl(upload) %
method=post enctype=multipart/form-data
...

input type=file name=myFile id=myFile  multiple /
input type=submit value=upload  
/form

---

JAVA


BlobstoreService service;
MapString, BlobKey blobs;
BlobKey blobkey;
BlobInfoFactory blobfactory;
BlobInfo blobinfo;

request = RequestLocator.get();
service = BlobstoreServiceFactory.getBlobstoreService();
blobs = service.getUploadedBlobs(request);
blobkey = blobs.get(myFile);

//get blob info
blobfactory = new BlobInfoFactory();
blobinfo = blobfactory.loadBlobInfo(blobkey);




When two or more files are specified input(id=myFile) area, only
last file blobkey can be acquired.

How can I acquire all blobkeys by 'service.getUploadedBlobs(request)'?


I do not know how to do it. Could anyone help me?

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Re: [appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread Mark Wyszomierski

Hmm ok I see, so I'm just using JDO without any frameworks on top of that,
but as mentioned in the slim3 tests, JDO does add overhead (sometimes a
significant amount). I don't plan to be doing any large queries (the slim3
example fetches 10,000 objects which I don't plan on doing at any point),
but what is important to me is that startup time. One to two seconds is
fine, four seconds starts pushing it, anything above that is pretty bad.

If we start using slim3 though, we lose the flexibility in moving to another
host (not that I know of any that can compare to app engine) since it'll be
interacting directly with big table instead of using jdo or jpa is an
intermediate?

Thanks

On Fri, Jun 11, 2010 at 8:07 AM, Rahul rahul.jun...@gmail.com wrote:

Jake,

Is there any official comments on this from google which says that it
discourage the pinging every 60 seconds or so.

Also if we have some framework which we will always like to have if
doing some production application then what is the way out.

Thanks,
Rahul

On Jun 11, 10:16 am, Jake jbrooko...@cast.org wrote:
Hi Mark,

Yes, you can do better than 4.5 seconds without a framework. Also,
there are layers that can be placed over the low level datastore (e.g
Objectify) that add ease-of-use without noticeable additions to the
startup time.

The 60 second pinging thing is, indeed, done by some users and is
officially discouraged by Google. At one point, I set up a similar
pinging feature and found that it really didn't work. Theoretically
it should, but the pings just caused loading requests every minute or
so, which simply reduced the likelihood that a user would see the
loading request; it didn't solve the problem.

Jake

On Jun 11, 7:32 am, Mark mar...@gmail.com wrote:

Hi, just joining in, trying to sum up:

In the best case (if we only use the low level datastore + no
frameworks on top) we can only hope that a fresh restart of our app
will take 4.5 seconds?

However if at least one user is hitting the site every 60 seconds from
somewhere in the world, then our app should be kept alive and no need
for restarts?

Not that I'm planning on doing it, but what prevents developers from
simply pinging the site every 60 seconds to force the app to stay in
memory? I ask what prevents it because if I play by the rules, I'm
going to get penalized if other developers are 'cheating' and doing
the artificial pinging,

Thanks

On Jun 9, 5:49 am, Jake jbrooko...@cast.org wrote:

Hey Tin,

Several people were using GAE's built in timing mechanism to ping the
server to accomplish the same thing. Google came out and officially
discouraged this as it tends to throw off any attempts they are
currently making to fix the problem. I can't tell people what to do,
but I opted to stop using this hack in the hopes that they will solve
the problem.

Besides, you'll notice that this hack doesn't really work over the
long run. It will essentially restart your server every minute and
won't really prevent the loading request from falling on your users
instead of on your ping.

Jake

On Jun 8, 1:54 pm, Tin tin.c...@gmail.com wrote:

Hi all:

We have found a temporary solution for this issue:
Try with an AJAX timer kicking the server (doing nothing), maybe
one
request per minute (or less) and GAE will keep our site / users in
the
same node.
In our testing it could avoid the GAE web instance reloaded, but if
the request interval is long, it would cause another Datastore
performance issue:http://goo.gl/98zkthatwillbefixed in near
future.

More info please refer to here:http://goo.gl/mzQR

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Re: [appengine-java] Re: Records Count

2010-06-11 Thread RAVINDER MAAN

thanks john
any thought for like operator of sql.how can we implement like operator
of sql in GAE

On Fri, Jun 11, 2010 at 8:49 PM, John Patterson jdpatter...@gmail.comwrote:

The best you could probably do is load into memory a structure that keeps
the employee type for every employee. When the user types some letters of a
name to search for you can perform a keys-only query and lookup the employee
type in this structure (rather than load the entity)

You would need 2 bits per employee (for 4 types) so even a million
employees would only require 250KB of memory (an array of 30K longs) which
shouldn't take too long to read from memcache when an instance starts.

You would then need to iterate over every result and count which type the
employee is. To optimise this you might cache the counts in memcache of 1
and 2 letter searches. So then you would only need to count on the fly
three letter searches i.e. all employees with names starting with smi

On 11 Jun 2010, at 20:53, RAVINDER MAAN wrote:

number of employee entities is going to be high .So i guess that
possibility of getting more then 1000 employees for any search is quite
high.

On Fri, Jun 11, 2010 at 6:56 PM, John Patterson jdpatter...@gmail.comwrote:

A lot depends on how many Employee entities you have.

You could do a sub search for each of the 4 employee types and use COUNT
to get the results. This will only work up to 1000 employees per employee
type.

Twig can execute queries in parallel so this would take no more time than
running your original query.

On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

Select count(*) from employee where name like '%searchname%' and type
='A' ;

My first problem is that i dint find any equivalent of like operator.Is
there any way to do it?
Secondly we can not keep record count for each search combination.what
will you suggest for this case?
Thanks once again.

On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:

And if you want count of records with some where clause, then you need
to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

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Re: [appengine-java] Re: Records Count

2010-06-11 Thread John Patterson

To do a suffix search, instead of storing a field value smith you
would need to store a multi valued property with smith, mith,
ith...

You can do a prefix search without the need to do this.

On 12 Jun 2010, at 00:12, RAVINDER MAAN wrote:

thanks john
any thought for like operator of sql.how can we implement like
operator of sql in GAE

On Fri, Jun 11, 2010 at 8:49 PM, John Patterson
jdpatter...@gmail.com wrote:
The best you could probably do is load into memory a structure that
keeps the employee type for every employee. When the user types
some letters of a name to search for you can perform a keys-only
query and lookup the employee type in this structure (rather than
load the entity)

You would then need to iterate over every result and count which
type the employee is. To optimise this you might cache the counts
in memcache of 1 and 2 letter searches. So then you would only need
to count on the fly three letter searches i.e. all employees with
names starting with smi

On 11 Jun 2010, at 20:53, RAVINDER MAAN wrote:

number of employee entities is going to be high .So i guess that
possibility of getting more then 1000 employees for any search is
quite high.

On Fri, Jun 11, 2010 at 6:56 PM, John Patterson jdpatter...@gmail.com
wrote:

A lot depends on how many Employee entities you have.

You could do a sub search for each of the 4 employee types and use
COUNT to get the results. This will only work up to 1000 employees
per employee type.

Twig can execute queries in parallel so this would take no more
time than running your original query.

On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

Thanks for your reply Ravi
let me explain the entire scenario.I have an employee
entity .User can search employees by giving part of name .There
are four type of employees .I have to show number of employees
matching user search criteria for every type of employee under
different tabs.Actual results are to be displayed only if user
open that tab.

In SQL term we could write following query

Select count(*) from employee where name like '%searchname%' and
type ='A' ;

My first problem is that i dint find any equivalent of like
operator.Is there any way to do it?
Secondly we can not keep record count for each search
combination.what will you suggest for this case?

Thanks once again.

On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:
Google app engine designed to work for any numbers of records with
in

minimum time, so SQL features like counting the records whenever
needed is not supported.
So you need to take care of such counter by urself at the time of
adding or deleting the records in a table/entity.

the total count from there.

And if you want count of records with some where clause, then you
need

to maintain it.

like if u want like this
select count(0) from tb where tb.propA='someValue'

then you may need to create a new entity say counterForTb, and have
few fields entityName and count and where clause columns
and whenevr you add a new record in tb then increase the count of
that

record in counter table and on delete decrease it.

Something for google guys
Just realized that all columns are indexed unless we specify to
not to

from indexes stats.
Is this something feasible?

it is not best way.

--
Regards,
Ravinder Singh Maan

[appengine-java] Re: update_indexes error

2010-06-11 Thread keyurva

FWIW, I followed what was suggested in the error logs and that worked
for me:

   1. Empty the index.yaml file (create a backup first)
   2. Run vacuum_indexes again
   3. Look at your app's admin console and don't go to the next step
till all your indexes are deleted.
   4. Specify the indexes you want to be created in index.yaml
   5. Run update_indexes
   6. Look at your app's admin console and it should show that your
indexes are now building.
   7. Enjoy the fruits of your labor :)

Cheers,
Keyur

On Jun 11, 9:45 am, keyurva keyu...@gmail.com wrote:
 Can someone on the app engine team help me out?

 Thanks,
 Keyur

 On Jun 10, 5:45 pm, keyurva keyu...@gmail.com wrote:

  I have a Java app deployed on app engine and I use appcfg.py of the
  Python SDK to vacuum and update my indexes.

  Today I first ran vacuum_indexes and that completed successfully -
  i.e. it en-queued tasks to delete my existing indexes.

  The next step was probably a mistake on my part - I then ran
  update_indexes even though my previous indexes weren't yet deleted.
  Needless to say that my update_indexes call errored out. So much so
  that now when I look at my app engine console, it shows the status of
  all my indexes as Error.

  Can someone help my out of my fix?!

  Thanks,
  Keyur



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[appengine-java] Re: Can't delete blobs via Google's admin UI

2010-06-11 Thread Alexander Orlov

Who has NOT this problem? Is there help out there?! Hello?!

I can't delete blobs I've uploaded and I don't think I'm in a
singularity that could explain this miss-behavior.

Comments from Googlers like We're working on this issue! or WTF are
you talking about?! would really help.

On Jun 11, 4:32 pm, Alexander Orlov alexander.or...@loxal.net wrote:
 Does anybody else has the same problem?

 An answer to this question would help me a lot.

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[appengine-java] Application that holds images dynamically(Open Image Server)

2010-06-11 Thread ylmz

Hi, everybody.
I wrote a web app that lets you upload images and store them in app
engine. it is very easy to use (and very easy to integrate in other
projects). if you need such functionality, please consider using this
one. You can get source code from homepage  
http://sourceforge.net/projects/openimageserver/
 . To see how it works just go to showcase ( http://oisshowcase.appspot.com
) , create some albums upload some images and let me know what you
think.

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[appengine-java] Re: Uploading to blobstore gives OutOfMemoryError

2010-06-11 Thread Vishal Singh

I have the same issue.

On Jun 4, 11:51 am, eighty eightyste...@gmail.com wrote:
 +1

 On Jun 2, 4:14 pm, Jean Hsu jeanhs...@gmail.com wrote:



  Hi all,

  I am trying to set up a basic file upload to blobstore,  but I get
  this OutOfMemoryError:

  WARNING: Error for /_ah/upload/
  aghvbWdkcmVzc3IcCxIVX19CbG9iVXBsb2FkU2Vzc2lvbl9fGMACDA
  java.lang.OutOfMemoryError: Java heap space
          at java.util.Arrays.copyOf(Arrays.java:2786)
          at 
  java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:71)
          at
  javax.mail.internet.MimeMultipart.readTillFirstBoundary(MimeMultipart.java:
  316)
          at javax.mail.internet.MimeMultipart.parse(MimeMultipart.java:186)
          at 
  javax.mail.internet.MimeMultipart.getCount(MimeMultipart.java:109)
          at
 com.google.appengine.api.blobstore.dev.UploadBlobServlet.handleUpload(Uploa 
 dBlobServlet.java:
  135)
          at com.google.appengine.api.blobstore.dev.UploadBlobServlet.access
  $000(UploadBlobServlet.java:72)
          at com.google.appengine.api.blobstore.dev.UploadBlobServlet
  $1.run(UploadBlobServlet.java:100)
          at java.security.AccessController.doPrivileged(Native Method)
          at
  com.google.appengine.api.blobstore.dev.UploadBlobServlet.doPost(UploadBlobS 
  ervlet.java:
  98)
          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:
  511);

  I used the Memory Analyzer on Eclipse and it said that the memory leak
  suspect is QueuedThreadPool.  I found this information about a memory
  leak bug:

 http://jira.codehaus.org/browse/JETTY-1188

  How can I figure out what release of jetty is running locally?  It
  looks like they fixed this in version 6.1.23:

 http://jira.codehaus.org/secure/ReleaseNote.jspa?projectId=11160vers...

  Has anyone else had this issue?

  Thanks,
  Jean

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[appengine-java] Re: Performance issue for GAE auto-restart

2010-06-11 Thread Thomas

Hi:

You can define the dao interfaces and write the implementation of
the interfaces with datastore low level api or some fast startup
framework other than JDO or JPA. If you need to migrate to other
platform which supports standard RDBMS, you implement the dao
interface with JDO, JPA or JDBC.

The entity relationship model design in appengine is very
different from other RDBMS. You can not use more than two inequality
filters or the 'OR' operator in your query. So the design which works
great with appengine is probably not good with RDBMS and vice versa. I
think even the model redesign is necessary when you leave appengine.
Unless you don't choose to use appengine, use JDO(JPA) save you
nothing.

On 6月12日, 上午1時07分, Mark Wyszomierski mar...@gmail.com wrote:
 Hmm ok I see, so I'm just using JDO without any frameworks on top of that,
 but as mentioned in the slim3 tests, JDO does add overhead (sometimes a
 significant amount). I don't plan to be doing any large queries (the slim3
 example fetches 10,000 objects which I don't plan on doing at any point),
 but what is important to me is that startup time. One to two seconds is
 fine, four seconds starts pushing it, anything above that is pretty bad.

 If we start using slim3 though, we lose the flexibility in moving to another
 host (not that I know of any that can compare to app engine) since it'll be
 interacting directly with big table instead of using jdo or jpa is an
 intermediate?

 Thanks


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[appengine-java] Re: Records Count

2010-06-11 Thread nischalshetty

For count, you need to implement sharded counters -
http://code.google.com/appengine/articles/sharding_counters.html

The code required to do the same is provided. Just understand what
sharded counters are and make use of the provided code.

-Nischal

On Jun 11, 10:37 pm, Nacho Coloma icol...@gmail.com wrote:
 GAE already includes a left-like operator (property LIKE 'foo%'). I
 don't know how to use it with JDO though, but it should be in the
 Reference Guide.

 For a full LIKE operator (LIKE '%foo%') there is a recent entry in the
 AppEngine 
 blog:http://googleappengine.blogspot.com/2010/04/making-your-app-searchabl...

 Hope  this helps.

 On Jun 11, 7:12 pm, RAVINDER MAAN rsmaan...@gmail.com wrote:



  thanks john
     any thought for like operator of sql.how can we implement like operator
  of sql in GAE

  On Fri, Jun 11, 2010 at 8:49 PM, John Patterson 
  jdpatter...@gmail.comwrote:

   The best you could probably do is load into memory a structure that keeps
   the employee type for every employee.  When the user types some letters 
   of a
   name to search for you can perform a keys-only query and lookup the 
   employee
   type in this structure (rather than load the entity)

   You would need 2 bits per employee (for 4 types) so even a million
   employees would only require 250KB of memory (an array of 30K longs) which
   shouldn't take too long to read from memcache when an instance starts.

   You would then need to iterate over every result and count which type the
   employee is.  To optimise this you might cache the counts in memcache of 1
   and 2 letter searches.  So then you would only need to count on the fly
   three letter searches i.e. all employees with names starting with smi

   On 11 Jun 2010, at 20:53, RAVINDER MAAN wrote:

   number of employee entities is going to be high .So i guess that
   possibility of getting more then 1000 employees for any search is quite
   high.

   On Fri, Jun 11, 2010 at 6:56 PM, John Patterson 
   jdpatter...@gmail.comwrote:

   A lot depends on how many Employee entities you have.

   You could do a sub search for each of the 4 employee types and use COUNT
   to get the results.  This will only work up to 1000 employees per 
   employee
   type.

   Twig can execute queries in parallel so this would take no more time than
   running your original query.

   On 11 Jun 2010, at 19:39, RAVINDER MAAN wrote:

   Thanks for your reply Ravi
      let me explain the entire scenario.I have an employee entity .User can
   search employees by giving part of name .There are four type of 
   employees .I
   have to show number of employees matching user search criteria for every
   type of employee under different tabs.Actual results are to be displayed
   only if user open that tab.
   In SQL term we could write following query

   Select count(*) from employee where name like '%searchname%' and type
   ='A' ;

   My first problem is that i dint find any equivalent of like operator.Is
   there any way to do it?
   Secondly we can not keep record count for each search combination.what
   will you suggest for this case?
   Thanks once again.

   On Fri, Jun 11, 2010 at 4:23 PM, Ravi ping2r...@gmail.com wrote:

   Google app engine designed to work for any numbers of records with in
   minimum time, so SQL features like counting the records whenever
   needed is not supported.
   So you need to take care of such counter by urself at the time of
   adding or deleting the records in a table/entity.

   If you just want total number of records and dont care if counting
   happened in last 24 hours then look into low level api for datastore
   statistics, GAE refreshes total count every 24 hours and you can read
   the total count from there.

   And if you want count of records with some where clause, then you need
   to maintain it.

   like if u want like this
   select count(0) from tb where tb.propA='someValue'

   then you may need to create a new entity say counterForTb, and have
   few fields entityName and count and where clause columns
   and whenevr you add a new record in tb then increase the count of that
   record in counter table and on delete decrease it.

   Something for google guys
   Just realized that all columns are indexed unless we specify to not to
   index, and there must be some index meta data/statistics saved
   somewhere in google data stores about index(like total records
   matching to this index). And if that stats can be accessible through
   some APIs then we may be able to get total count just by reading data
   from indexes stats.
   Is this something feasible?

   On Jun 11, 11:39 am, RAVINDER MAAN rsmaan...@gmail.com wrote:
How can we get records count for a query in JDO.
In sql we have select count(*) from table_name
i want to get number of records returned by a query. what is the
efficient way to do that.One option is to use size() function .I think
it is not best way.

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[appengine-java] Dump Datastore Queries

2010-06-11 Thread Phuong Nguyen

I want to dump all queries to the datastore for performance analysis
reason. Is there any way to do it in local development environment

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[appengine-java] Re: Need help on java.security.AccessControlException: access denied

2010-06-11 Thread Nick

Hello Ikai,


While,
I moved file to new location WEB-INF/ssma_std.txt, It worked.

Thank you so much.

Nick


On Jun 7, 2:38 pm, Ikai L (Google) ika...@google.com wrote:
 Can you try placing the file into WEB-INF and setting filename to
 WEB-INF/ssma_std.txt?



 On Sat, Jun 5, 2010 at 4:42 PM, Nick lgfr...@gmail.com wrote:
  Hi,

  I'm new to GoogleAppEngine,
  please help me on resolving following erro...

  1. I would like to  read a ssma_stud.txt file as an input file.
     This file resides in a path  web/ssma_stud.txt

  2. As well, updated appengine-web.xml with following...
         system-properties
               property name=com.google.gdata.DisableCookieHandler
  value=true/
       /system-properties

  3.  My objective is to read a text file and generate a HashMap which I
  can use into my servlet

        Code:
                                 String fileName = /ssma_stud.txt;

                                 ArrayList arrayListLineReadData = new
  ArrayList();
                                 try
                                 {
                                         BufferedReader inBuffReader = new
  BufferedReader(new
  FileReader(fileName));
                                         if (!inBuffReader.ready())
                                                 throw new IOException();

  4. on this line   BufferedReader inBuffReader = new
  BufferedReader(new FileReader(fileName));
     I get following error..:

  java.security.AccessControlException: access denied
  (java.io.FilePermission \ssma_stud.txt read)
         at

  java.security.AccessControlContext.checkPermission(AccessControlContext.java:
  323)
         at
  java.security.AccessController.checkPermission(AccessController.java:
  546)
         at java.lang.SecurityManager.checkPermission(SecurityManager.java:
  532)
         at com.google.appengine.tools.development.DevAppServerFactory
  $CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
         at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
         at java.io.FileInputStream.init(FileInputStream.java:100)
         at java.io.FileInputStream.init(FileInputStream.java:66)
         at java.io.FileReader.init(FileReader.java:41)
         at

  com.lgframe.design.C_Stud_Comb_Axial_Bend_Servlet.getArrayListLineReadData(C_Stud_Comb_Axial_Bend_Servlet.java:
  411)
         at

  com.lgframe.design.C_Stud_Comb_Axial_Bend_Servlet.doPost(C_Stud_Comb_Axial_Bend_Servlet.java:
  114)
         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:
  511)
         at org.mortbay.jetty.servlet.ServletHandler
  $CachedChain.doFilter(ServletHandler.java:1166)
         at

  com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:
  51)
         at org.mortbay.jetty.servlet.ServletHandler
  $CachedChain.doFilter(ServletHandler.java:1157)
         at

  com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:
  43)
         at org.mortbay.jetty.servlet.ServletHandler
  $CachedChain.doFilter(ServletHandler.java:1157)
         at

  com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:
  122)
         at org.mortbay.jetty.servlet.ServletHandler
  $CachedChain.doFilter(ServletHandler.java:1157)
         at
  org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
  388)
         at
  org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
  216)
         at
  org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
  182)
         at
  org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
  765)
         at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
  418)
         at

  com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:
  70)
         at
  org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
  152)
         at com.google.appengine.tools.development.JettyContainerService
  $ApiProxyHandler.handle(JettyContainerService.java:349)
         at
  org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
  152)
         at org.mortbay.jetty.Server.handle(Server.java:326)
         at
  org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
  542)
         at org.mortbay.jetty.HttpConnection
  $RequestHandler.content(HttpConnection.java:938)
         at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
         at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
         at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
         at
  org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
  409)
         at org.mortbay.thread.QueuedThreadPool

Re: [appengine-java] Dump Datastore Queries

2010-06-11 Thread John Patterson


Have you checked out Appstats?

On 12 Jun 2010, at 09:38, Phuong Nguyen wrote:


I want to dump all queries to the datastore for performance analysis
reason. Is there any way to do it in local development environment

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