Ok, i found that the reason actually was my using isolated ears with dedicated loader repositores, enabled in the jboss-app.xml <!DOCTYPE jboss-app | PUBLIC "-//JBoss//DTD J2EE Application 1.4//EN" | "http://www.jboss.org/j2ee/dtd/jboss-app_4_2.dtd"> | <jboss-app> | <loader-repository> | palmyra-bsp-bestandsdaten-1.0:loader=bsp-bestandsdaten-1.0.EAR | <loader-repository-config> | java2ParentDelegation=true | </loader-repository-config> | </loader-repository> | </jboss-app> Once I empty the jboss-app.xml, everything works fine. Is there a way to have my isolated ear serve its classes for remote class loading? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4143117#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...