Hi, I've made progress. Not sure why, but the error has changed to: java.lang.ClassCastException: $Proxy75 cannot be cast to com.azavia.calculator.ejb.Calculator The line is: Calculator calculator = (Calculator)context | .lookup("CalculatorApplication/CalculatorBean/remote"); Have tried redeploying a few times, and restarting JBoss, to no avail. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3987033#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...