I have a method to calculate some values before persisting to the database. So i annotated it with @PrePersist. If i merge an object the annotated method get's called but all members are on their default values. I only tried it with new objects. So merge get's an object with id = null and therefore shoud behave like persist. (I always use merge)
If i set a breakpoint before the em.merge(..) call the object is ok. Inside the @PrePersist method all fields are cleared.
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