Hi, when I click on "service=TreeCache-Cluster" link under "jboss.cache" in JMX console, I get a NoClassDefFoundError. I just copied my whole JBoss 4.2 installation from my windows dev machine to the linux server. Everything works perfectly, even TreeCache itself. The only difference is that on the server machine I get the exception whereas dev machine does work. This is the exception: java.lang.NoClassDefFoundError: org/jgroups/MembershipListener | java.lang.ClassLoader.defineClass1(Native Method) | java.lang.ClassLoader.defineClass(ClassLoader.java:620) | java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) | java.net.URLClassLoader.defineClass(URLClassLoader.java:260) | java.net.URLClassLoader.access$100(URLClassLoader.java:56) | java.net.URLClassLoader$1.run(URLClassLoader.java:195) | java.security.AccessController.doPrivileged(Native Method) | java.net.URLClassLoader.findClass(URLClassLoader.java:188) | org.jboss.mx.loading.RepositoryClassLoader.findClassLocally(RepositoryClassLoader.java:675) | org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:655) | java.lang.ClassLoader.loadClass(ClassLoader.java:306) | org.jboss.mx.loading.RepositoryClassLoader.loadClassLocally(RepositoryClassLoader.java:193) | org.jboss.mx.loading.ClassLoadingTask$ThreadTask.run(ClassLoadingTask.java:131) | org.jboss.mx.loading.LoadMgr3.nextTask(LoadMgr3.java:399) | org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:520) | org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:408) | java.lang.ClassLoader.loadClass(ClassLoader.java:299) | java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:580) | java.lang.ClassLoader.loadClass(ClassLoader.java:251) | org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1345) | org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204) | org.jboss.jmx.adaptor.control.Server.getMBeanAttributeResultInfo(Server.java:156) | org.apache.jsp.inspectMBean_jsp._jspService(inspectMBean_jsp.java:185) | org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) | javax.servlet.http.HttpServlet.service(HttpServlet.java:803) | org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:387) | org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320) | org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266) | javax.servlet.http.HttpServlet.service(HttpServlet.java:803) | org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.inspectMBean(HtmlAdaptorServlet.java:204) | org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.processRequest(HtmlAdaptorServlet.java:96) | org.jboss.jmx.adaptor.html.HtmlAdaptorServlet.doGet(HtmlAdaptorServlet.java:77) | javax.servlet.http.HttpServlet.service(HttpServlet.java:690) | javax.servlet.http.HttpServlet.service(HttpServlet.java:803) | org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | | Any ideas? tazman View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057487#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...