I installed JBoss 4.0.5 GA using the jems-installer-1.2.0.GA.jar: I started the jems-installer-1.2.0.GA.jar and used the EJB3 support (without clustering) and the standard configuration. Then I installed the JBM 1.2.0 GA with the ant build script in the util directory, started JBoss using "run ?c messaging", and executed the ant in the examples/ejb3mdb directory. System: Windows XP, jdk1.5.0_11 The same procedure works perfectly with the JBM 1.0.1.SP4. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4025357#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...