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javax.persistence.PersistenceException: org.hibernate.HibernateException: Could not find datasource	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:737)	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:121)	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)	at org.openxava.jpa.XPersistence.getEntityManagerFactory(XPersistence.java:175)	at org.openxava.jpa.XPersistence.createManager(XPersistence.java:102)	at org.openxava.annotations.parse.AnnotatedClassParser.getManagedClassNames(AnnotatedClassParser.java:1633)	at org.openxava.annotations.parse.AnnotatedClassParser.getClassNameFor(AnnotatedClassParser.java:1601)	at org.openxava.annotations.parse.AnnotatedClassParser.parse(AnnotatedClassParser.java:47)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.openxava.util.Objects.execute(Objects.java:193)	at org.openxava.util.Objects.execute(Objects.java:112)	at org.openxava.component.ComponentParser.parseAnnotatedClass(ComponentParser.java:54)	at org.openxava.component.ComponentParser.parse(ComponentParser.java:34)	at org.openxava.component.MetaComponent.get(MetaComponent.java:60)	at org.openxava.view.View.getMetaModel(View.java:229)	at org.openxava.view.View.getMetaView(View.java:212)	at org.openxava.view.View.createMetaMembers(View.java:142)	at org.openxava.view.View.getMetaMembers(View.java:121)	at org.openxava.view.View.getMetaProperties(View.java:2302)	at org.openxava.view.View.getFirsEditablePropertyId(View.java:2995)	at org.openxava.view.View.calculateFocusPropertyId(View.java:2973)	at org.openxava.view.View.getFocusPropertyId(View.java:2959)