I know what you are thinking: the Objecttype of the parameters in the service is int and not java.lang.Integer. I have changed the code inside the Service to java.lang.Integer and so on. And I have used your type of service-call. But I allways get the ReflectionException. The parameter type now equals. I think this is not the error anymore. A XMBean I have to install into a sar directory. The ejb3-Service I have installed as .jar file inside a normal folder in the deploy directory. Can this be the error? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4148529#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...