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java.lang.NullPointerException: 	at java.lang.Class.searchFields(Class.java:2599)	at java.lang.Class.getField0(Class.java:2618)	at java.lang.Class.getField(Class.java:1518)	at org.hibernate.ejb.util.PersistenceUtilHelper.get(PersistenceUtilHelper.java:84)	at org.hibernate.ejb.util.PersistenceUtilHelper.isLoadedWithReference(PersistenceUtilHelper.java:76)	at org.hibernate.ejb.HibernatePersistence.isLoadedWithReference(HibernatePersistence.java:178)	at javax.persistence.Persistence$1.isLoaded(Persistence.java:81)	at org.hibernate.validator.engine.resolver.JPATraversableResolver.isReachable(JPATraversableResolver.java:33)	at org.hibernate.validator.engine.resolver.DefaultTraversableResolver.isReachable(DefaultTraversableResolver.java:112)	at org.hibernate.validator.engine.resolver.SingleThreadCachedTraversableResolver.isReachable(SingleThreadCachedTraversableResolver.java:47)	at org.hibernate.validator.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:764)	at org.hibernate.validator.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:331)	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForRedefinedDefaultGroup(ValidatorImpl.java:278)	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:260)	at org.hibernate.validator.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:213)	at org.hibernate.validator.engine.ValidatorImpl.validate(ValidatorImpl.java:119)