Hi, We had this issue in production. For us it was a bug in hibernate and java assist when using remote interfaces to the SLSB's. The fix is to replace javaassist.jar and hibernate jars in jboss. We used javaassist 3.4 and hibernate 3.2.3.ga. Hope this helps. Here is our patch script. | <copy file="../JNET-LIBS/jboss-patch/javassist.jar" todir="${jboss.home}/client"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate3.jar" todir="${jboss.home}/client"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate-annotations.jar" todir="${jboss.home}/client"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate-commons-annotations.jar" todir="${jboss.home}/client"/> | <copy file="../JNET-LIBS/jboss-patch/javassist.jar" todir="${jboss.home}/server/default/lib"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate3.jar" todir="${jboss.home}/server/default/lib"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate-annotations.jar" todir="${jboss.home}/server/default/lib"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate-commons-annotations.jar" todir="${jboss.home}/server/default/lib"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate-entitymanager.jar" todir="${jboss.home}/server/default/lib"/> | <copy file="../JNET-LIBS/jboss-seam-1-1-6-lib/hibernate-validator.jar" todir="${jboss.home}/server/default/lib"/> | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4039784#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...