Hi I have a big problem using richfaces-3.3.0 with JBoss 5.1.0.GA. I had a EAR (prueba.ear) that run perfect in JBoss-4.2.0.GA but when I run the same ear in jboss-5.1.0.GA the error is: java.lang.LinkageError: Class org/richfaces/component/html/HtmlPanelMenu violates loader constraints - prueba.ear was generated using seam-2.1.2 - I copy the three jar of richfaces (api,impl,ui) to server/default/lib The objective of application is to generate a dynamic menu. The classes are: Menu.class ---------- package com.mydomain.prueba.action; import javax.ejb.Local; import org.richfaces.component.UIPanelMenu; @Local public interface Menu { public UIPanelMenu getMenuSistemas(); } MenuEJB.class ------------- package com.mydomain.prueba.action; import javax.ejb.Stateless; import org.jboss.seam.annotations.Name; import org.richfaces.component.UIPanelMenu; import org.richfaces.component.UIPanelMenuGroup; import org.richfaces.component.UIPanelMenuItem; import org.richfaces.component.html.HtmlPanelMenu; import org.richfaces.component.html.HtmlPanelMenuGroup; import org.richfaces.component.html.HtmlPanelMenuItem; @Stateless @Name("Menu") public class MenuEJB implements Menu { private UIPanelMenu menuSistemas; private UIPanelMenuGroup grupo; private UIPanelMenuItem opcion; public UIPanelMenu getMenuSistemas() { try { this.menuSistemas = new HtmlPanelMenu(); this.grupo = new HtmlPanelMenuGroup(); this.grupo.setId("Sistema"); this.grupo.setLabel("Grupo"); this.opcion = new HtmlPanelMenuItem(); this.opcion.setId("rol"); this.opcion.setLabel("Opcion"); this.grupo.getChildren().add(this.opcion); this.menuSistemas.getChildren().add(this.grupo); } catch (Exception e) { System.out.println("Error creando el menu: " + e.toString()); } return this.menuSistemas; } } And in the page I write this: <rich:panelMenu binding="#{Menu.menuSistemas}" style="width:100%" mode="ajax" iconExpandedGroup="disc" iconCollapsedGroup="disc" iconExpandedTopGroup="chevronUp" iconGroupTopPosition="right" iconCollapsedTopGroup="chevronDown" iconCollapsedTopPosition="right"> </rich:panelMenu> The configurations file are the same that seam create. The error is: ------------- javax.el.ELException: /menuSistemas.xhtml @29,73 binding="#{CrearMenu.menuSistemas}": Error reading 'menuSistemas' on type org.javassist.tmp.java.lang.Object_$$_javassist_seam_3 The stack trace is: ------------------- javax.faces.FacesException: javax.el.ELException: /menuSistemas.xhtml @29,73 binding="#{CrearMenu.menuSistemas}": Error reading 'menuSistemas' on type org.javassist.tmp.java.lang.Object_$$_javassist_seam_3 at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:257) at org.jboss.seam.jsf.SeamApplication.createComponent(SeamApplication.java:394) at com.sun.facelets.tag.jsf.ComponentHandler.createComponent(ComponentHandler.java:224) at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:139) at com.sun.facelets.tag.CompositeFaceletHandler.apply(CompositeFaceletHandler.java:47) at com.sun.facelets.tag.jsf.ComponentHandler.applyNextHandler(ComponentHandler.java:314) at com.sun.facelets.tag.jsf.ComponentHandler.apply(ComponentHandler.java:169) at com.sun.facelets.tag.ui.CompositionHandler.apply(CompositionHandler.java:119) at com.sun.facelets.compiler.NamespaceHandler.apply(NamespaceHandler.java:49) at com.sun.facelets.compiler.EncodingHandler.apply(EncodingHandler.java:25) at com.sun.facelets.impl.DefaultFacelet.apply(DefaultFacelet.java:95) at com.sun.facelets.FaceletViewHandler.buildView(FaceletViewHandler.java:524) at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:567) at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100) at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176) at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110) at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178) at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:390) at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517) at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53) at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) at java.lang.Thread.run(Unknown Source) Caused by: javax.el.ELException: /menuSistemas.xhtml @29,73 binding="#{CrearMenu.menuSistemas}": Error reading 'menuSistemas' on type org.javassist.tmp.java.lang.Object_$$_javassist_seam_3 at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:76) at com.sun.faces.application.ApplicationImpl.createComponent(ApplicationImpl.java:246) ... 61 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32) at org.jboss.seam.intercept.ClientSideInterceptor$1.proceed(ClientSideInterceptor.java:76) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.ejb.RemoveInterceptor.aroundInvoke(RemoveInterceptor.java:43) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.SynchronizationInterceptor.aroundInvoke(SynchronizationInterceptor.java:32) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.ClientSideInterceptor.invoke(ClientSideInterceptor.java:54) at org.javassist.tmp.java.lang.Object_$$_javassist_seam_3.getMenuSistemas(Object_$$_javassist_seam_3.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at javax.el.BeanELResolver.getValue(BeanELResolver.java:62) at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54) at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) at org.jboss.el.parser.AstPropertySuffix.getValue(AstPropertySuffix.java:53) at org.jboss.el.parser.AstValue.getValue(AstValue.java:67) at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) at com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) ... 62 more Caused by: java.lang.LinkageError: Class org/richfaces/component/html/HtmlPanelMenu violates loader constraints at $Proxy409.getMenuSistemas(Unknown Source) ... 88 more Please help me! Thanks