Silently ignored remove()

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Take a look at this answer. Basically, JPA specification mandates that a removed entity becomes managed again if the persist operation is applied to it.

To verify that this is really happening, enable the trace log level for org.hibernate package and search for log entries like:

un-scheduling entity deletion ...

To avoid any unpredictable behaviour, it is recommended that references to removed entities are removed from all the other entity instances that are loaded the same session/transaction.

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