Update form another EJB with DAO persistence

We have two modules with EJB Session, stateless, with CMT requeried in all methods, the first module has the persistence tier wiht DAOs pattern and the other module uses TopLink. We are using JSF as framework in the presentation layer, when we are going to update the database from web form a backing bean JSFcalls the first EJB (DAOs persistence) and this EJB invokes the other EJB (Toplink persistence). and throws the next exception
05/10/31 17:12:12 java.lang.NullPointerException
05/10/31 17:12:12      at oracle.toplink.internal.indirection.UnitOfWorkValueHolder.getValueFromServerObject(UnitOfWorkValueHolder.java:105)
05/10/31 17:12:12      at oracle.toplink.internal.indirection.UnitOfWorkValueHolder.instantiate(UnitOfWorkValueHolder.java:144)
05/10/31 17:12:12      at oracle.toplink.internal.indirection.DatabaseValueHolder.getValue(DatabaseValueHolder.java:64)
05/10/31 17:12:12      at oracle.toplink.internal.indirection.BasicIndirectionPolicy.cloneAttribute(BasicIndirectionPolicy.java:88)
05/10/31 17:12:12      at oracle.toplink.mappings.ForeignReferenceMapping.buildClone(ForeignReferenceMapping.java)
05/10/31 17:12:12      at oracle.toplink.internal.descriptors.ObjectBuilder.populateAttributesForClone(ObjectBuilder.java:1492)
05/10/31 17:12:12      at oracle.toplink.publicinterface.UnitOfWork.cloneAndRegisterNewObject(UnitOfWork.java:601)
05/10/31 17:12:12      at oracle.toplink.publicinterface.UnitOfWork.internalRegisterObject(UnitOfWork.java:2294)
05/10/31 17:12:12      at oracle.toplink.internal.sessions.MergeManager.registerObjectForMergeCloneIntoWorkingCopy(MergeManager.java:688)
05/10/31 17:12:12      at oracle.toplink.internal.sessions.MergeManager.mergeChangesOfCloneIntoWorkingCopy(MergeManager.java:397)
05/10/31 17:12:12      at oracle.toplink.internal.sessions.MergeManager.mergeChanges(MergeManager.java:181)
05/10/31 17:12:12      at oracle.toplink.publicinterface.UnitOfWork.mergeClone(UnitOfWork.java:2634)
05/10/31 17:12:12      at oracle.toplink.publicinterface.UnitOfWork.deepMergeClone(UnitOfWork.java:1231)
05/10/31 17:12:12      at siscoi.declaracionescambio.business.DeclaracionesCambioMngr.grabarDeclaracionCambio(DeclaracionesCambioMngr.java:222)
when the objects are new the TopLink framework works good, but when the object already exist in the DB, does not make the update an thorw the null pointer exception why?.
We implements a Client Class to only test the EJB with Toplink persistence. In this class read a object from de database and i modify the object and calls the update method and the update works good.
Container oc4j 10.1.2
Toplink 9.0.4
jdk 1.4.2.04
please help me!!

It looks like the issue is occurring because the object that you are merging is a new object, or TopLink thinks it is a new object and it is being registered as a new object. The new object has a non-instantiated value-holder that seems to have been serialized so can no longer be instantiated, but the relationship is required to persist the new object.
My guess is that the object is not new, but existing, and the issue is most likely with your does-exist-check option. The original object may no longer be in the cache, so you most likely need to use check-database for your descriptor's does-exist option, instead of the default of check-cache.

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http://www.pwc.com/au
                                                                                Kacyndra
             <[email protected]
             >                                                          To
                                       Sandra K Smith/AU/TLS/PwC@AsiaPac
             08/08/2009 12:25                                           cc
             AM
Subject
                                       Livecycle
             Please respond to         Designer 8 - Is it possible to have
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you can either do it individually:
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