I don't know if it is the right group to post my question. I run a default jboss server4.0.3 and I got the error as below. Anyone has any idea about it? Thanks a lot! ERROR [org.apache.catalina.core.ContainerBase.[jboss.web]. [localhost].[/jmx-console].[HtmlAdaptor]] Servlet.service() for servlet HtmlAdaptor threw exception javax.management.InstanceNotFoundException: jmx.loading:UCL=4f682a53 is not registered. at org.jboss.mx.server.registry.BasicMBeanRegistry.get(BasicMBeanRegistry. java:508) at org.jboss.mx.server.MBeanServerImpl.getMBeanInfo(MBeanServerImpl.java:6 51) at org.jboss.jmx.adaptor.control.Server.getMBeanData(Server.java:83) at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.inspectMBean(HtmlAdaptorS ervlet.java:186) at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdapto rServlet.java:81) at org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doGet(HtmlAdaptorServlet. java:62) at javax.servlet.http.HttpServlet.service(HttpServlet.java:697) at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applic ationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFil terChain.java:173) at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilt er.java:81) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applic ationFilterChain.java:202) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFil terChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperVal ve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextVal ve.java:178) at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincip alValve.java:39) at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityA ssociationValve.java:159) at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve. java:59) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.jav a:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.jav a:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve .java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java: 148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:8 56) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process Connection(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoin t.java:527) at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorke rThread.java:112) at java.lang.Thread.run(Thread.java:595) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4082727#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...