Hello,
This problem sounds odd, as entities are really just POJO's. What is stranger is that I would expect that the A->B relationship is null, not that B would be populated with nulls. It is almost like all your data has been marked transient and so is lost during serialization. Can you try sending just the B entity across and see if you still lose your data?
Also, please post the A and B entities (or a subset just so we can get an idea of what goes missing).
Best Regards,
Chris
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