"jaikiran" wrote : Have you configured classloading in your application? These might help you understand what's going on: | | http://www.jboss.org/community/wiki/ClassCastExceptions | | http://www.jboss.org/community/wiki/ClassLoadingConfiguration | | http://www.jboss.org/community/wiki/JBossClassLoadingUseCases | | In relation to http://www.jboss.org/community/wiki/ClassCastExceptions about using the JMX console of JBoss for verify duplicate deployments, the jmx console show me: org.richfaces.component.UIPanelMenu Information Not loaded in repository cache There is no problem, and prueba.ear is the unique application in the server. The richfaces libraries only exist in server/default/lib and are the same version of application. In relation to http://www.jboss.org/community/wiki/ClassLoadingConfiguration about isolation: The first part (jboss-app.xml) <jboss-app> <loader-repository> prueba:archive=prueba.ear </loader-repository> </jboss-app> and jboss-web.xml <jboss-web> <class-loading> <loader-repository> pruebaWar:archive=pruebaWar </loader-repository> </class-loading> </jboss-web> It doesn't work. The second part about Isolation with Overriding Server Classes <jboss-app> <loader-repository> prueba:archive=prueba.ear <loader-repository-config> java2ParentDelegation=false </loader-repository-config> </loader-repository> </jboss-app> <jboss-web> <class-loading java2ClassLoadingCompliance="false"> <loader-repository> pruebaWar:archive=pruebaWar <loader-repository-config>java2ParentDelegation=false</loader-repository-config> </loader-repository> </class-loading> </jboss-web> It doesn't work. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4249249#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...