Hi, that's a standard iterator problem, no EJB3 issue ;-): for(RoleFunction roleFunction:this.listRoleFunctions){ | ... | this.listRoleFunctions.remove(roleFunction); You remove an item from the list over which you iterate. Use this "for (int index = this.listRoleFunctions.size() - 1; index >= 0; index--)" to avoid this. Best regards Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4263717#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...