I was getting this error and I did two things and the problem went away.
1) - I was using @PersistenceUnit annotation for whatever reason so I switched it to use
@PersitenceContext
2) - I had the entity manager field private with a public getter and protected setter. I
had problems until I made both accessors public. I'm not sure if I had made them both
protected or removed them period if I would have had the same problem.
Hope this helps.
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