Java serialization of EJB entity not serializing one member of ManyToMany set - but only sometimes?

In case anyone is interested: I haven't found an answer to the question. I suspect it has something to do with the way the linked Group objects are stored in a bernate PersistentSet (although PersistentSet and the HashSet backing it are both serializable). I have given up on debugging - time is money.

I worked around the problem by adding an additional field to my User entity, Set groupIds. I fill up this set in User. WriteObject, which is called when User is serialized.

On the receiving side, I clear out the groups set, and then manually search for the groups based on the IDs stored in the groupIds field. I then add the groups to the user's group set. It's cumbersome, and it requires that I have first synchronized the groups in order to be able to reassign them - but it works.

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