Have you tried 3.0.1?  It has better exception handling code, so you 
should get a better error message.

-dain

Arijit Ghosh wrote:
> Hi,
> 
>         I'm using container managed transaction of Jboss 3.0 with Tomcat
> 4.0.3.  We are using the Struts framework and Castor.
> 
>         When i try to modify an existing object, the first time it works
> fine. the next time it throws the
> exception given below. Again the third time it works, 4th time exception
> and so on..
> However if we try to modify object1 for the first time, there is no
> problem. Then we modfy object2 for the first time, there is no problem.
> If we now try to modify object1 again i.e. for the 2nd time, exception
> is thrown.
> 
> 
> First 2 set of codes are Deployment descriptor, ejb-jar.xml and Vendor
> specific file jboss.xml
> 
> modifyClientDetails() is first called from Action class. This in turn
> calls the corresponding method in the clientManagerBean.The method in
> the Bean performs 2 calls, 1st calls findByPrimaryKey() defined in
> CastorMain. This performs database operation. 2nd, it calls populate()
> [which is not a database call]. findByPrimaryKey() in CastorMain
> performs the following oeration --
> db = dobj.getDatabase();
> aData = db.load(aClass, aKey);
> 
> EXCEPTION is shown at the end.
> 
> Error seems to be on the client side and not on the Server side.
> 



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