Tried posting this on EJB3.0 forum but may be this is better forum for this issue
Basically, EJB3 MDBs which were working fine with JBoss 4.0.4.GA, JBoss Messaging1.0.1.CR5 and EJB3 RC8 have stopped working with EJB3 RC9.
Tried also running the example EJB3MDB that comes with JBoss Messaging and got the same exception
10:49:25,242 WARN [ServiceController] Problem starting service jboss.j2ee:jar=m db-example.ejb3,name=EJB3MDBExample,service=EJB3 java.lang.NullPointerException at org.jboss.ejb3.mdb.MDB.getMessagingType(MDB.java:85) at org.jboss.ejb3.mdb.inflow.JBossMessageEndpointFactory.resolveMessageL istener(JBossMessageEndpointFactory.java:241)
The MDB implements just the MessageListener interface so this really puzzling.