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JPA /Hibernate mappiing error

 
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I'm trying to persist a simple User object to an HSQLDB.The code performs a check to see if the User already exist and if not , then persists the User object.
The code is shown below :



The User class looks like :


and my persistence.xml :




When I try to run the application , I'm getting the following exception:

 
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Please do not duplicate post.

Thanks

Mark
 
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