Re: Lazy fields issue with Hibernate/OpenEJB

Thu, 07 Aug 2008 03:08:57 -0700 

Ok.  Whipped up another build.

  http://people.apache.org/~dblevins/openejb-3.1-r683569.zip

Let's see if we don't have better luck with this one.

-David


On Aug 7, 2008, at 1:08 AM, Sami Jaber wrote:
I have checked out the last revision of EjbOutputStream and resolveClass 
method :
http://svn.apache.org/viewvc/openejb/trunk/openejb3/server/openejb-client/src/main/java/org/apache/openejb/client/EjbObjectInputStream.java?view=markup&pathrev=672430
This bug should not occurs if I have the right version of openejbclient.jar 

 catch (ClassNotFoundException e) {
           String n = classDesc.getName();
           if (n.equals("boolean")) return boolean.class;
           if (n.equals("byte")) return byte.class;
           if (n.equals("char")) return char.class;
           if (n.equals("short")) return short.class;
           if (n.equals("int")) return int.class;
           if (n.equals("long")) return long.class;
           if (n.equals("float")) return float.class;
           if (n.equals("double")) return double.class;

I have decompiled the jar you sent me David, here the result :

// Decompiled by Jad v1.5.8g. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3)
// Source File Name:   EjbObjectInputStream.java

package org.apache.openejb.client;

import java.io.*;
import java.lang.reflect.Proxy;

public class EjbObjectInputStream extends ObjectInputStream
{
   public EjbObjectInputStream(InputStream in)
       throws IOException
   {
       super(in);
   }

   protected Class resolveClass(ObjectStreamClass classDesc)
       throws IOException, ClassNotFoundException
   {
return Class.forName(classDesc.getName(), false, getClassloader()); 
   }

   protected Class resolveProxyClass(String interfaces[])
       throws IOException, ClassNotFoundException
   {
       Class cinterfaces[] = new Class[interfaces.length];
       for(int i = 0; i < interfaces.length; i++)
           cinterfaces[i] = getClassloader().loadClass(interfaces[i]);
       try
       {
           return Proxy.getProxyClass(getClassloader(), cinterfaces);
       }
       catch(IllegalArgumentException e)
       {
           throw new ClassNotFoundException(null, e);
       }
   }

   ClassLoader getClassloader()
   {
       return Thread.currentThread().getContextClassLoader();
   }
}
We got it. If you can send a working jar of openejb-ejb I will be grateful 


Sami

2008/8/7 Sami Jaber <[EMAIL PROTECTED]>


Damned, here is my stacktrace

Starting Main ...
Debug of initialContext
{java .naming .factory .initial=org.apache.openejb.client.RemoteInitialContextFactory, 
java.naming.security.principal=USERNAME,
openejb.home=W:\dev_tools\openejb-3.0,
openejb.embedded.remotable=true, local-copy=false,
openejb.server.debug=true, openejb.deployments.classpath.ear=true,
openejb.configuration=W:\dev_tools\openejb-3.0\conf\openejb.xml,
openejb.loader=embed, java.naming.security.credentials=PASS}

javax.ejb.EJBException: Container has suffered a SystemException
   at
org .apache .openejb.client.EJBObjectHandler._invoke(EJBObjectHandler.java:173) 
   at
org .apache .openejb .client.EJBInvocationHandler.invoke(EJBInvocationHandler.java:117) 
   at
org .apache .openejb .client .proxy.Jdk13InvocationHandler.invoke(Jdk13InvocationHandler.java:52) 
   at $Proxy0.call(Unknown Source)
   at fr.aeag.redevances.presentation.Main.main(Main.java:45)
Caused by: java.rmi.RemoteException: The server has encountered a fatal 
error: Error caught during request processing
java.lang.ClassNotFoundException: boolean; nested exception is:
   java.lang.ClassNotFoundException: boolean
   at
org .apache .openejb .server .ejbd.EjbRequestHandler.replyWithFatalError(EjbRequestHandler.java: 425) 
   at
org .apache .openejb .server .ejbd.EjbRequestHandler.processRequest(EjbRequestHandler.java:103) 
   at
org .apache .openejb.server.ejbd.EjbDaemon.processEjbRequest(EjbDaemon.java:164) at org.apache.openejb.server.ejbd.EjbDaemon.service(EjbDaemon.java:122) at org.apache.openejb.server.ejbd.EjbDaemon.service(EjbDaemon.java:84) at org.apache.openejb.server.ejbd.EjbServer.service(EjbServer.java:60) at org.apache.openejb.server.ServicePool$2.run(ServicePool.java: 78) at org.apache.openejb.server.ServicePool$3.run(ServicePool.java: 101) 
   at
java.util.concurrent.ThreadPoolExecutor $Worker.runTask(ThreadPoolExecutor.java:885) 
   at
java.util.concurrent.ThreadPoolExecutor $Worker.run(ThreadPoolExecutor.java:907) 
   at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassNotFoundException: boolean
   at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
   at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
   at java.lang.Class.forName0(Native Method)
   at java.lang.Class.forName(Class.java:247)
   at
org .apache .openejb .client.EjbObjectInputStream.resolveClass(EjbObjectInputStream.java: 35) 
   at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java: 1575) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) at java.io.ObjectInputStream.readClass(ObjectInputStream.java: 1462) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java: 1312) at java.io.ObjectInputStream.readObject(ObjectInputStream.java: 351) 
   at
org.apache.openejb.client.EJBRequest $Body.readMethodParameters(EJBRequest.java:386) 
   at
org.apache.openejb.client.EJBRequest $Body.readExternal(EJBRequest.java:200) 
   at
org .apache .openejb .server .ejbd.EjbRequestHandler.processRequest(EjbRequestHandler.java:101) 
   ... 9 more

Your test case works obviously over LocalInitialContext.
Does it mean it is a regression ?


Sami


2008/8/7 David Blevins <[EMAIL PROTECTED]>



On Aug 6, 2008, at 2:33 PM, Sami Jaber wrote:
Well David, I have the bits you sent me (kindly) yesterday by mail when I 
asked you for a "patched" version of 3.0 supporting
deployments.classpath.ear.
(http://people.apache.org/~dblevins/openejb-3.1-r683137.tar.gz<http://people.apache.org/%7Edblevins/openejb-3.1-r683137.tar.gz > 
)
Do you think that I could get a patched version of the patched version 
that
correct this bug ?
I pay you a beer to thank you ;-)



It should contain that bug fix.  Hmmm...
Give a bean like this a try over the RemoteInitialContextFactory, if it 
works, then the explanation given in
https://jira.jboss.org/jira/browse/EJBTHREE-440 cannot be accurate.

  @Stateless
  public class TesterBean implements Tester {
      public Object call(Object object) {
          return object;
      }
  }

  public interface Tester {
      public Object call(Object object);
  }

Then in your client code make these calls:

tester.call(boolean.class);
tester.call(byte.class);
tester.call(char.class);
tester.call(short.class);
tester.call(int.class);
tester.call(long.class);
tester.call(float.class);
tester.call(double.class);

-David






2008/8/6 David Blevins <[EMAIL PROTECTED]>

On Aug 6, 2008, at 10:28 AM, Dain Sundstrom wrote:


I believe this this the JIRA for the issue:



https://jira.jboss.org/jira/browse/EJBTHREE-440
It appears that Hibernate requires a custom ObjectInputStream to work 
properly.  They claim the root cause is this VM bug:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4171142

It seems strange that is could be the cause of the bug.

David, what do you think?



We did have that bug in 3.0 final.  It's since been fixed:

http://issues.apache.org/jira/browse/OPENEJB-832
http://svn.apache.org/viewvc?view=rev&revision=672429  (the fix)
http://svn.apache.org/viewvc?view=rev&revision=672444  (the tests)

Sami, what version of the openejb-client.jar are you using?

-David



On Aug 6, 2008, at 9:53 AM, Sami Jaber wrote:



Hi all,



I try to get the couple JPA(Hibernate) and OpenEJB works with an
application
that uses lazy fields in Pojo.
My application is pretty simple, I have an inheritance and some lazy 
fields
are declared FetchMode.LAZY.
When I run a client remotely, i get the same error before any call : 


javax.ejb.EJBException: Unknown Container Exception:
java.rmi.RemoteException: Error reading response from server
(OEJP/3.0) :
cannot assign instance of
org.hibernate.proxy.pojo.javassist.SerializableProxy to field
mypackage.Pojo.controleur of type mypackage.domain.user.User in
instance
of
mypackage.OtherPojo; nested exception is:
java.lang.ClassCastException: cannot assign instance of
org.hibernate.proxy.pojo.javassist.SerializableProxy to field
mypackage.Pojo.controleur of type mypackage.domain.user.User in
instance
of
mypackage.OtherPojo

OtherPojo inherits from Pojo. With all kind of combination
(remotable=true,
local-copy/true or false, ....), switching to cglib<- >javaassist, I 
get
desperately the same exception. Note that with LocalInitialContext, 
all
works perfectly. As soon as I run cross JVM calls thru
RemoteInitialContext,
it hangs.

My problem is very close to this issue :


http://www.jboss.com/index.html?module=bb&op=viewtopic&t=76737&postdays=0&postorder=asc&start=0

any clue? this is very frustrating ...
Or, if anybody can provide me with a test case that makes OpenEJB and 
Hibernate work with lazy fields, i would really appreciate


Sami

ps : here is my server stacktrace when the error raises
2008-08-06 18:39:02,975 - FATAL - Couldn't write EjbResponse to output 
stream
java.net.SocketException: Software caused connection abort: socket 
write
error
  at java.net.SocketOutputStream.socketWrite0(Native Method)
  at
java .net.SocketOutputStream.socketWrite(SocketOutputStream.java:92) at java.net.SocketOutputStream.write(SocketOutputStream.java: 136) 
  at
java.io.ObjectOutputStream $BlockDataOutputStream.drain(ObjectOutputStream.java:1838) 
  at
java.io.ObjectOutputStream $ BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java: 1747) 
  at
java .io .ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java: 1249) 
  at
java .io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java: 1203) 
  at
java .io .ObjectOutputStream .writeOrdinaryObject(ObjectOutputStream.java:1387) 
  at
java .io.ObjectOutputStream.writeObject0(ObjectOutputStream.java: 1150) 
  at
java .io .ObjectOutputStream .writeFatalException(ObjectOutputStream.java:1538) 
  at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java: 329) 
  at
org .apache .openejb.client.EJBResponse.writeExternal(EJBResponse.java:133) 
  at
org .apache .openejb .server .ejbd.EjbRequestHandler.processRequest(EjbRequestHandler.java: 215) 
  at
org .apache .openejb .server.ejbd.EjbDaemon.processEjbRequest(EjbDaemon.java:164) 
  at
org .apache.openejb.server.ejbd.EjbDaemon.service(EjbDaemon.java: 122) 
  at
org .apache.openejb.server.ejbd.EjbDaemon.service(EjbDaemon.java:84) 
  at
org .apache.openejb.server.ejbd.EjbServer.service(EjbServer.java:60) at org.apache.openejb.server.ServicePool $2.run(ServicePool.java:78) 
  at
org.apache.openejb.server.ServicePool$3.run(ServicePool.java: 101) 
  at
java.util.concurrent.ThreadPoolExecutor $Worker.runTask(ThreadPoolExecutor.java:885) 
  at
java.util.concurrent.ThreadPoolExecutor $Worker.run(ThreadPoolExecutor.java:907) 
  at java.lang.Thread.run(Thread.java:619)

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