the mbean implemetation: public class ModelService extends ServiceMBeanSupport implements ModelServiceMBean { public ModelObj getModelObj(String id) { ModelObj obj = new ModelObj(); some action here; returen obj; } } ModelObj is a simple pojo I defined,there're only some getter and setter the mbean definition: the web service method code as follows: public String getModelName(String id) { try { MBeanServer server = org.jboss.mx.util.MBeanServerLocator.locateJBoss(); Class clazz = server.getClassLoaderRepository().loadClass("jboss.mbean.model.ModelObj"); ObjectName oname = new ObjectName("jboss.momo:service=ModelSvr"); String[] sig = { String.class.getName() }; Object[] opArgs = { new String("A01") }; Object result = server.invoke(oname, "getModelObj", opArgs, sig); ModelObj mo = (ModelObj)clazz.cast(result);//some thing error,I wanna make the return object to cast to my defined object to invoke more operation,but just here comes some error "java.lang.ClassCastException: jboss.mbean.model.ModelObj" return mo.getName(); } catch (Exception e) { e.printStackTrace(); return null; } } the web service definition: <beanMapping languageSpecificType="java:jboss.mbean.model.ModelObj" qname="ns7:ModelSvc" xmlns:ns7="ModelSvc"/> when in other client(command line run mode) Object result = server.invoke(oname, "getModelObj", opArgs, sig); can be write like this: //MBeanServer server = org.jboss.mx.util.MBeanServerLocator.locateJBoss(); Hashtable env = new Hashtable(); env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory"); env.put(Context.PROVIDER_URL, "10.1.0.2"); Context iniCtx = new InitialContext(env); RMIAdaptor server = (RMIAdaptor) iniCtx.lookup("jmx/rmi/RMIAdaptor"); ModelObj result = (ModelObj)server.invoke(oname, "getModelObj", opArgs, sig); this will not throws java.llang.ClassCastException View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3963997#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...