I'am using Local SessionBeans with Object Arguments. For Example: @Stateless @Local(BiManager.class) @LocalBinding(jndiBinding="BiManager") public class UserManagerBean implements UserManager { public void registerUser(Object newUserData){ ... I get a error message (IllegalArgumentException....) When i am changing "Object newUserData" to "String newUserData" then i get a correct configurated Code, which is running on the deploy folder. On the other hand, when i change the code from LocalBean to RemoteBean then the code is not running. So my conclusion is that i can use primitive datatypes only on LocalBeans and with RemoteBeans i can handle object types. is this a bug or feature. Am I doing smth wrong? Thanks for your replies. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3978724#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...