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This exception has no message.
java.lang.NullPointerException at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.callPredeploy(JavaSECMPInitializer.java:120) at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initPersistenceUnits(JavaSECMPInitializer.java:279) at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initialize(JavaSECMPInitializer.java:298) at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initializeFromMain(JavaSECMPInitializer.java:335) at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.getJavaSECMPInitializer(JavaSECMPInitializer.java:78) at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.getServerSession(EntityManagerFactoryProvider.java:235) at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:94) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:61) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:50)