I figured out the problem I was having, and hopefully this may help you... Make sure to put a try-catch around the entire body of code for your EJB interfaces. Basically I was having a problem with the SLSB.method, when it tried to invoke a SFSB.method2. I my body of code for "SLSB.method" I had lookup("SFSB"), and in Oracle this works fine, but for Jboss, I had to put "SFSB/local", and forgot to change the interface to Local as well, hense my SLSB.method was getting a ClassCastException, which propogated to the CLIENT as a null exception or ClassCastException with some sort of $Proxy cause... Anyway once I straightened this out, my Client worked OK. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4077038#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...