Writing MBeans on Weblogic Server 8.1 sp5

Question

Hi,
I am trying to write a standard mbean for managing my application. As of now its a simple MBean which just needs to print hello world on the server when a MBean Client invokes it. Let me discuss the apporach i have taken. Classes that have been devloped are.
Interface HelloMBean.java which doesnt extend any interface (as this is not a dynamic mbean). This contains a method hello()
Class Hello.java implementing the HelloMBean. This contains the method hello() which does the printing on the server when invoked.
HelloStartup which registers the mbean with the MBeanServer after doing a JNDI lookup for "weblogic.management.server"
MBeanClient.java which does a look up for the mbean the code of which is :-
url = "t3://localhost:7001" ;
username = "weblogic";
password = "weblogic";
MBeanHome home = null;
Environment env = new Environment();
env.setProviderUrl(url);
env.setSecurityPrincipal(username);
env.setSecurityCredentials(password);
Context ctx = env.getInitialContext();
//Retrieving the Administration MBeanHome interface
Object obj = ctx.lookup(MBeanHome.ADMIN_JNDI_NAME);
home = (MBeanHome) PortableRemoteObject.narrow(obj, MBeanHome.class);
WebLogicObjectName mbeanName = new WebLogicObjectName("MBeanDomain:Name=Hello,Type=ServerConfig");
WebLogicMBean mbean = (WebLogicMBean)home.getMBean(mbeanName);
Now At the server startup i see that the mbean has got successfully registered by using the isRegistered() method. But when i try to retreive the object from client i am getting a exception javax.management.InstanceNotFoundException.
I would appreciate if anyone could help me out in this issue. Also if anyone has written any sample code to register and invoke the mbeans written using other interfaces like DynamicMBean, WeblogicMBean etc and could share them or perhaps give pointers in how to go about writing and invoking them in weblogic would be really helpfull.
I read somewhere that till 7.0 weblogic didnt support writing of custom MBeans can anyone confirm that we can write custom MBeans on 8.1 ??
My purpose of writing this MBean is to invoke it from across the JVM. I know its possible using rmi but do think MBean would be the rite choice for it.
Thanks in advance

Answer 1

Change this code
<i>WebLogicObjectName mbeanName = new WebLogicObjectName("MBeanDomain:Name=Hello,Type=ServerConfig");
WebLogicMBean mbean = (WebLogicMBean)home.getMBean(mbeanName);</i>
to
MBeanServer mbs = home.getMBeanServer()
ObjectName oname = new ObjectName("MBeanDomain:Name=Hello,Type=ServerConfig");
// to invoke your mbean's hello method
mbs.invoke(oname, "hello", null, null);
You should remember that for CustomMBean's you cannot use MBeanHome.
HTH,
-satya
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