Problem solved. For those who are interested: http://www.ime.usp.br/~reverbel/SMA/maillist/msg00059.html Even if I don't speak Fench? Spanish? DontKnow?, it says: <trans-attribute>Required</trans-attribute> Has to be updated to <trans-attribute>RequiresNew</trans-attribute> in ejb-jar.xml, which is the initial origin of my error mentioned above. And as I already thougt, my "RMI-IIOP" - Issue was solved as well ;-) Just post here for more details. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3962881#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...