[jboss-user] [Installation, Configuration & Deployment] - NoClassDefFoundError: org/jboss/system/ServiceMBean

Hi Sorry if this is a complete newbie question... I'm trying to move a set of .sars onto jboss 4.0.5 (from 3.something). One of the classes in the .sar extends org.jboss.system.ServiceMBean. But on attempting to deploy, I get the following error: org.jboss.deployment.DeploymentException: - nested throwable: (java.lang.reflect.UndeclaredThrowableException) at org.jboss.system.ServiceConfigurator.install(ServiceConfigurator.java:196) at org.jboss.system.ServiceController.install(ServiceController.java:226) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) (lines removed) Caused by: java.lang.NoClassDefFoundError: org/jboss/system/ServiceMBean at java.lang.ClassLoader.findBootstrapClass(Native Method) at java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:891) at java.lang.ClassLoader.loadClass(ClassLoader.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:299) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268) at java.lang.ClassLoader.loadClass(ClassLoader.java:299) at java.lang.ClassLoader.loadClass(ClassLoader.java:299) at org.jboss.mx.loading.RepositoryClassLoader.loadClassLocally(RepositoryClassLoader.java:190) at org.jboss.mx.loading.UnifiedLoaderRepository3.loadClassFromClassLoader(UnifiedLoaderRepository3.java:277) I presume that this is some sort of class loader issue... but I'm not making a lot of progress after several hours. Any suggestions gratefully received. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3994895#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...