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java.lang.NullPointerException: 	at org.hibernate.id.enhanced.OptimizerFactory$PooledOptimizer.generate(OptimizerFactory.java:414)	at org.hibernate.id.enhanced.TableGenerator.generate(TableGenerator.java:463)	at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:119)	at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)	at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:178)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:134)	at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:64)	at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:729)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:705)	at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:709)	at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:846)	at org.jboss.as.jpa.container.AbstractEntityManager.persist(AbstractEntityManager.java:575)	at edu.city.set.eia.citypress.beans.AbstractFacade.create(AbstractFacade.java:24)	at edu.city.set.eia.citypress.beans.RegisUserFacade.create(RegisUserFacade.java:16)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:45)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:44)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)	at org.jboss.as.ee.component.ViewDescription$ComponentDispatcherInterceptor.processInvocation(ViewDescription.java:202)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:50)	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:287)	at org.jboss.as.ejb3.component.session.SessionInvocationContextInterceptor$CustomSessionInvocationContext.proceed(SessionInvocationContextInterceptor.java:126)	at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:211)