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This exception has no message.
java.lang.NullPointerException at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes( at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions( at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush( at org.hibernate.internal.SessionImpl.autoFlushIfRequired( at org.hibernate.internal.SessionImpl.list( at org.hibernate.internal.QueryImpl.list(