Hi, I think you should remove all three files from WEB-INF\lib of the WAR. The JBoss ones are found at those locations: -ejb3-persistence.jar => common\lib -el-api.jar => common\lib , jsf-api.jar => server\default\deploy\jbossweb.sar\jsf-libs Normally, NetBeans should add those to the references/class path of your project (at least Eclipse does so ;-) ). Best regards Wolfgang View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4253028#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...