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java.lang.IllegalArgumentException: No persistence unit named 'entityManager' is available in scope jsf_ejb_jpa. Available persistence units: []	at weblogic.persistence.ModulePersistenceUnitRegistry.getPersistenceUnit(ModulePersistenceUnitRegistry.java:130)	at weblogic.persistence.BasePersistenceContextProxyImpl.init(BasePersistenceContextProxyImpl.java:40)	at weblogic.persistence.TransactionalEntityManagerProxyImpl.init(TransactionalEntityManagerProxyImpl.java:31)	at weblogic.persistence.EntityManagerInvocationHandlerFactory.createTransactionalEntityManagerInvocationHandler(EntityManagerInvocationHandlerFactory.java:20)	at weblogic.persistence.PersistenceManagerObjectFactory.createPersistenceContextProxy(PersistenceManagerObjectFactory.java:66)	at weblogic.persistence.PersistenceManagerObjectFactory.getObjectInstance(PersistenceManagerObjectFactory.java:31)	at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)	at weblogic.jndi.internal.WLEventContextImpl.lookup(WLEventContextImpl.java:251)	at weblogic.jndi.internal.WLContextImpl.lookup(WLContextImpl.java:406)	at weblogic.j2eeclient.java.ClientReadOnlyContextWrapper.lookup(ClientReadOnlyContextWrapper.java:35)	at weblogic.jndi.internal.AbstractURLContext.lookup(AbstractURLContext.java:130)	at javax.naming.InitialContext.lookup(InitialContext.java:392)	at javax.naming.InitialContext.doLookup(InitialContext.java:265)	at com.oracle.pitchfork.inject.Jsr250Metadata.jndiLookup(Jsr250Metadata.java:307)	at com.oracle.pitchfork.inject.Jsr250Metadata.resolveByName(Jsr250Metadata.java:303)	at com.oracle.pitchfork.inject.Jsr250Metadata.resolve(Jsr250Metadata.java:266)	at com.oracle.pitchfork.inject.Jsr250Metadata.applyInjections(Jsr250Metadata.java:228)	at com.oracle.pitchfork.inject.Jsr250Metadata.inject(Jsr250Metadata.java:219)	at com.oracle.pitchfork.spi.BaseComponentBrokerImpl.getBean(BaseComponentBrokerImpl.java:63)	at com.oracle.pitchfork.spi.EjbComponentCreatorBrokerImpl.getBean(EjbComponentCreatorBrokerImpl.java:33)	at weblogic.ejb.container.injection.EjbComponentCreatorImpl.getBean(EjbComponentCreatorImpl.java:76)	at weblogic.ejb.container.manager.BaseEJBManager.createNewBeanInstance(BaseEJBManager.java:209)	at weblogic.ejb.container.manager.BaseEJBManager.allocateBean(BaseEJBManager.java:235)	at weblogic.ejb.container.manager.StatelessManager.createBean(StatelessManager.java:293)	at weblogic.ejb.container.pool.StatelessSessionPool.createBean(StatelessSessionPool.java:185)	at weblogic.ejb.container.pool.StatelessSessionPool.getBean(StatelessSessionPool.java:114)	at weblogic.ejb.container.manager.StatelessManager.preInvoke(StatelessManager.java:174)	at weblogic.ejb.container.internal.BaseLocalObject.getBeanInstance(BaseLocalObject.java:146)	at weblogic.ejb.container.internal.BaseLocalObject.preInvoke(BaseLocalObject.java:103)	at weblogic.ejb.container.internal.BaseLocalObject.__WL_preInvoke(BaseLocalObject.java:67)	at weblogic.ejb.container.internal.SessionLocalMethodInvoker.invoke(SessionLocalMethodInvoker.java:20)	at com.example.dao.jpa.JpaUserDAO_wrkew_UserDAOImpl.add(Unknown Source)	at com.example.backing.IndexBacking.addUser(IndexBacking.java:38)