[jboss-jira] [JBoss JIRA] (AS7-5496) Hibernate proxy class not found in remote EJB call

[Scott Marlow (JIRA)]

    [ https://issues.jboss.org/browse/AS7-5496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717931#comment-12717931 ] 

Scott Marlow commented on AS7-5496:
-----------------------------------

To answer your question about *when* this can be addressed.  Once we have a patch for it, it can be applied for a future community release.  From everything that you have said so far, it is sounding like something that should be fixed in Hibernate (or possibly Javassist if needed).

Creating the patch, would probably involve:
* checkout Hibernate sources
* add a unit test to Hibernate that serializes the proxy class and then tries to deserialize it from a different classloader.  There might already be a similar test that could be modified to do this.
* fix the bug (after debugging to investigate further)

The last step is kind of open, depending on what the actual cause is.
                
> Hibernate proxy class not found in remote EJB call
> --------------------------------------------------
>
>                 Key: AS7-5496
>                 URL: https://issues.jboss.org/browse/AS7-5496
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: JPA / Hibernate
>    Affects Versions: 7.1.1.Final
>         Environment: Java 1.6.0_35 and Java 1.7.0_07
> Mac OS X 10.8.1, Windows XP and Gentoo Linux with Kernel 3.5.3
>            Reporter: Uwe Seimet
>            Assignee: Scott Marlow
>         Attachments: deployments.tar.gz, server.log, sources.tar.gz, sources2.tar.gz, test.sql
>
>
> Prerequisites:
> 1. A JPA entity A with a reference to a different JPA entity B. FetchType is FetchType.LAZY, e.g.
> @Entity
> public class A {
>   @ManyToOne(fetch = FetchType.LAZY)
>   private B refToB;
> }
> @Entity
> public class B {
> }
> 2. A remote interface with methods passing an instance of A, .e.g.
> @Remote
> public interface ITest {
>     A test1();
>     void test2(A a);
> }
> 3. A process calling test1() and then test2() on the remote interface like this:
>   @EJB(lookup = "...")
>   private ITest iTest;
>   public void ITest() {
>         final A a = iTest.test1();
>         iTest.test2(a);  }
>   }
> Error description: When calling test1() an instance of A is returned. This instance is valid and works as expected. The reference to B is a proxy (something like B_$$_javassist_2), which was expected because B was loaded lazily and was never accessed in the remote process before. When passing the instance of A back by calling test2(a) an exception of this type is raised:
> java.lang.ClassNotFoundException: B_$$_javassist_2 from [Module "deployment.x.ear.y_ejb.jar:main" from Service Module Loader]
> 	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
> 	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(Concurrent
> ClassLoader.java:468)
> It looks as if the proxy cannot be serialized or deserialized. The behavior is reproducible with different applications on different platforms. As soon as a Hibernate javassist proxy, which was received via a remote call, is passed back as an argument in another remote call (the remote process is the same in all calls) the exception is raised.
> The classloader settings are the standard JBoss settings.

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