NullPointerException when hibernate.hbm2ddl.auto = update in a persistence unit using Oracle

01:50:20,928 ERROR [org.hibernate.tool.hbm2ddl.SchemaUpdate] (ServerService Thread Pool -- 57) HHH000299: Could not complete schema update: java.lang.NullPointerException
	at org.hibernate.tool.hbm2ddl.DatabaseMetadata.initSequences(DatabaseMetadata.java:156) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.tool.hbm2ddl.DatabaseMetadata.<init>(DatabaseMetadata.java:70) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.tool.hbm2ddl.DatabaseMetadata.<init>(DatabaseMetadata.java:63) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:196) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:178) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:505) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1750) [hibernate-core-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:94) [hibernate-entitymanager-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:920) [hibernate-entitymanager-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904) [hibernate-entitymanager-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:92) [hibernate-entitymanager-4.2.0.Final-redhat-1.jar:4.2.0.Final-redhat-1]
	at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.createContainerEntityManagerFactory(PersistenceUnitServiceImpl.java:200) [jboss-as-jpa-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
	at org.jboss.as.jpa.service.PersistenceUnitServiceImpl.access$600(PersistenceUnitServiceImpl.java:57) [jboss-as-jpa-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
	at org.jboss.as.jpa.service.PersistenceUnitServiceImpl$1.run(PersistenceUnitServiceImpl.java:99) [jboss-as-jpa-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [rt.jar:1.6.0_39]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [rt.jar:1.6.0_39]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_39]
	at org.jboss.threads.JBossThread.run(JBossThread.java:122)