jmx-console

[editha]

In the documentation it says that the jmx-console provides a listing of all MBeans registered with the MBeanServer.

but when I try:

myrmiadaptor.invoke(new javax.management.ObjectName("JMImplementation:service=LoaderRepository","getLoaders",new Object[]{},newString[]{});

I get a InstanceNotFoundException:JMImpementation:service=LoaderRepsoitory is not registered

although it is listed in jmx-console.

Why is that?

[peterj]

When I want to look up an mbean, I usually go through JNDI as follows:

Context ctx = new InitialContext(...);
MBeanServerConnection mconn = (MBeanServerConnection)ctx.lookup("jmx/invoker/RMIAdaptor");
String mbean = "JMImplementation:service=LoaderRepository";
Object result = mconn.invoke(new ObjectName(mbean), "getLoaders", new Object[]{} ,newString[]{});

[editha]

Thank you for your answer!

I tried to do it your way but it still isn't working. I still get the MBeanException caused by the InstanceNotFoundException..

[peterj]

I went to the jmx-console and noticed that the name you should be looking up is:

String mbean = "JMImplementation:name=Default,service=LoaderRepository";

[editha]

Thank you very much!
I was indeed looking at the wring name.

[editha]

Now I'm facing another problem:

Invoking some methods of the LoaderRepository mbean works, and invoking other methods doesn't work:

e.g.
mconn.invoke(new ObjectName(mbean), "getUrls", new Object[]{} ,newString[]{});

works, whereas

mconn.invoke(new ObjectName(mbean), "getLoaders", new Object[]{} ,newString[]{});

throws a ReflectionException caused by an IllegalArgumentException: Unable to find operation getLoaders() in AbstractMBeanInvoker.

The method getLoaders() doesn't take any arguments, so I do not know why this exception is thrown. Any ideas?

[peterj]

There is no "getLoaders" method, nor is there a "Loaders" property. I do see a getPackageClassLoaders method.

[editha]

Thank you for your quick answer. Where do you see that? I was looking at the jboss LoaderRepository class...

[peterj]

I ran the jmx-console and looked at the available properties and operations.

[editha]

Ah, now I saw it too. thanks again!

I thought since since it is an instance of UnifiedLoaderRepository3, I thought it was inheriting the methods of the LoaderRepository class, but it seems I was wrong..