Re: [JBoss-user] JGStore Error: cannot assign instance of $Proxy90to field.. (fwd)

Jules Gosnell Wed, 02 Apr 2003 16:54:01 -0800

Joao Pedro Clemente wrote:


Ok. I think I've followed you. Is this the point where we should file a
bug report? Or direct this subject to someone else with more experties,
like Sacha, for instance?
Maybe he can validate this guess... From what you know, wich JBoss
developer is more confortable with the RMI Classloading implementation?

Thank you for your fast analysis, Jules.

It is in my code - so I should deal with it. I will try to look at it tomorrow and see if I can figure out what needs doing...

Can you confirm that you are pulling in an ejp proxy from a remote server ? Or perhaps the EJBs are local, and one has been made in the src server, but not in the tgt server ? Let me know the situation as this will help me figure out what is happening.

Jules

Joao Clemente

On Wed, 2 Apr 2003, Jules Gosnell wrote:

Hmmm...

I guess I must have made the assumption that if a class was available to
the src webapp to serialise, then it would be available to the
destination webapp to deserialise...

That may have been a mistake as it looks like your src webapp has
managed to obtain a proxy for an EJB, which can be serialised to a
destination webapp which cannot deserialise it as it does not have the
class to hand...

I guess we need to integrate this deserialisation with JBoss' RMI
classloading...

As far as I understand it, when you obtained the proxy via RMI, it was
shipped to you with a tag containing a URL from which it's class could
be downloaded. This pointed back to the JBoss WebServer (a confusing
misnomer for an HttpServer which only serves Classes).

When your source webapp ships the same proxy to your destination webapp,
it needs it's class to deserialise it. It should retireve it from the
same URL, but something is obviously going wrong. This is not really my
area, but if you know anything about RMI and classloading, this should
give you a good start.

Jules

P.S.

This is my best guess - it could be wrong...

---------- Forwarded message ----------
Date: Tue, 11 Mar 2003 16:48:04 -0000 (WET)
From: [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject: [JBoss-user] JGStore Error: cannot assign instance of $Proxy90 to
   field..

I've used the CVS version to overcome the

ERROR [JGStore] could not demarshal incoming update
java.lang.ClassNotFoundException

but now I got a new one:
Cannot assign instance of $Proxy<xx>
to field <remote.reference.to.ejb>
of type  <ejb.interface>
in instance of <servlet.that.contains.reference>

ERROR [org.mortbay.j2ee.session.JGStore] could not demarshal incoming update
java.lang.ClassCastException: cannot assign instance of $Proxy90 to field
inocrea.web.webmail.model.JwmaFolderImpl.remote of type
inocrea.ejb.mail.interfaces.MailFolder in instance of
inocrea.web.webmail.model.JwmaFolderImpl
at
java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:1840)
at java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1062)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1851)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)

I'll post the code I find relevant of the servlet in question:


/*snip*/
import inocrea.ejb.mail.interfaces.MailFolder;
/*snip*/

public class JwmaFolderImpl
implements JwmaFolder, JwmaTrashInfo, JwmaInboxInfo, Serializable {
 protected MailFolder remote;
 protected FolderVO vo;

 public JwmaFolderImpl(MailFolder mailFolder) {
   remote = mailFolder;
   try {
     vo = remote.getFolderVO();
   } catch(RemoteException e) {
     Log1.error(""+e);
   }
 }


Any tip? Thank you
Joao Clemente

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Re: [JBoss-user] JGStore Error: cannot assign instance of $Proxy90to field.. (fwd)

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