Do it and no success ;-(. Apparently jmx-console doesn´t find duplicate instances of class, and jboss-j2ee.jar is not packaged. Is strange, because if i copy util.jar too into war\web-inf\lib works perfectly The line where error is: UserFacadeHome userFacadeHome = | (UserFacadeHome) EJBHomeLocator.getEJBHome( | userFacadeHomeJNDIName, UserFacadeHome.class); | This code is in a class inside war. And EJBHomeLocator.getEJBHome is inside util.jar. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3973302#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...