You haven't posted the exception stacktrace, so i can't say for sure - but I remember that there was a bug where if the jndi name used for injection was incorrect, then instead of a NameNotFoundException, this NullPointerException was being raised from the JndiUtil. This bug was fixed in AS 5.0. P.S: No matter what search term i try, i am not able to find the JIRA number for this. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4231510#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...