Multiple persistence units and OneToMany associations

Hi,
I have an EAR with two persistence units and corresponding entities. Each is contained within a separate library jar file. Some of the entities in one of the jars refer to entities in the other jar. If I refer to just a single entity (i.e., a OneToOne association), everything builds and deploys with no problems, but if I use a collection (OneToMany association), I get errors when trying to deploy the project.
I've been playing around with this for a while and have seen different errors such as the following:
[exec] CLI171 Command deploy failed : Deploying application in domain failed; Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0.1 (Build b04-fcs (04/11/2008))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
[exec] Exception Description: predeploy for PersistenceUnit [GrammarUserData] failed.
[exec] Internal Exception: Exception [TOPLINK-7155] (Oracle TopLink Essentials - 2.0.1 (Build b04-fcs (04/11/2008))): oracle.toplink.essentials.exceptions.ValidationException
[exec] Exception Description: The type [interface java.util.List] for the attribute [sentencePatterns] on the entity class [class com.leadingstep.grammar.configuration.CommonElementConfiguration] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
I also had the collection defined as a Set and it complained about that as well. I have many other OneToMany associations used between entities within the same persistence unit that use the List interface with no problems, and so that's why I'm wondering if the problem actually comes from the fact that the entities in the failed case belong to different persistence units?
At another point, the error message I was getting was:
[#|2009-12-22T20:05:02.427-0500|SEVERE|sun-appserver9.1|javax.enterprise.system.tools.deployment|_ThreadID=15;_ThreadName=Thread-32;_RequestID=67ca0eee-64d9-41dc-8093-eec811cb32b6;|Exception occured in J2EEC Phase
com.sun.enterprise.deployment.backend.IASDeploymentException: Exception [TOPLINK-28018] (Oracle TopLink Essentials - 2.0.1 (Build b04-fcs (04/11/2008))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: predeploy for PersistenceUnit [GrammarUserData] failed.
Internal Exception: Exception [TOPLINK-7250] (Oracle TopLink Essentials - 2.0.1 (Build b04-fcs (04/11/2008))): oracle.toplink.essentials.exceptions.ValidationException
Exception Description: [class com.leadingstep.grammar.configuration.CommonConstructorConfiguration] uses a non-entity [class com.leadingstep.grammar.db.sentences.SentenceGroup] as target entity in the relationship attribute [private java.util.List com.leadingstep.grammar.configuration.CommonConstructorConfiguration.sentenceGroups].
The target entity it refers to here definitely has the @Entity annotation and again, is associated with other entities within the same persistence unit with no problems.
Am I right in thinking the problem comes from the association of entities between the different persistence units? Is there something special I have to do to make this work?
BTW, both persistence units use the <exclude-unlisted-classes> and specifically list every entity that should be included.
Thanks for any help!
Renee

One other thought on this. I'm using Glassfish with Toplink and have it create the tables using:
<property name="toplink.ddl-generation" value="create-tables" />
Could it be something related to the table creation in this case that's causing the problem?
Renee

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