I have removed the reference to the Hibernate persistence provider in my persistence.xml. Now I get these two errors when I deploy: Error in allocating a connection. Cause: Connection could not be allocated because: java.net.ConnectException : Error opening socket to server localhost on port 1527 with message : Connection refused: no further information;_RequestID=9a3c9def-0d6d-4b07-9ebf-4884caec03cf;|RAR5114 : Error allocating connection : [Error in allocating a connection. Cause: Connection could not be allocated because: java.net.ConnectException : Error opening socket to server localhost on port 1527 with message : Connection refused: no further information] Exception sending context initialized event to listener instance of class org.jboss.seam.servlet.SeamListener java.lang.NullPointerException | at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:120) | at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83) | at org.jboss.seam.persistence.EntityManagerFactory.startup(EntityManagerFactory.java:72) If I had to guess, I'd say the first error is due to the Seam stuff trying to connect to a JNDI server, but I have no idea on the second. I guess I'm just going to have to revert to Spring-managed EMs for the time being, which is a pity, but I'm running out of time. :| View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4064579#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...