Unable to deploy MBeans in Tomcat 7 using Modeler API

[Yogesh Rao]

Hi,

I am trying to write a MBean using the Modeler API in tomcat. The details
of my environment are as below:-

Tomcat version : 7.0.54
JDK version : 1.7
OS : windows 7

 The MBean written using Modeler API is not getting deployed and hence not
showing up on JConsole.
 Following is the simple MBean code which has been written with its
mbeans-descriptors.xml

 HelloMBean.java
 -------------------------

package com.example.mbean;

public interface HelloMBean {

void sayHello();
}


Hello.java
---------------------------
package com.example.mbean;

import javax.management.MBeanException;
import javax.management.RuntimeOperationsException;

import org.apache.catalina.mbeans.MBeanUtils;
import org.apache.tomcat.util.modeler.BaseModelMBean;
import org.apache.tomcat.util.modeler.ManagedBean;
import org.apache.tomcat.util.modeler.Registry;

public class Hello extends BaseModelMBean implements HelloMBean  {


protected Registry registry = MBeanUtils.createRegistry();
protected ManagedBean managed = registry.findManagedBean("Custom");

protected Hello() throws MBeanException, RuntimeOperationsException {
super();
}

@Override
public void sayHello() {
System.out.println("sayHello()");
}

}

mbeans-descriptors.xml
------------------------------
<?xml version="1.0"?>
<mbeans-descriptors>
<mbean name="Custom"
  className="com.example.mbean.Hello"
          description="Custom Hello"
          domain="Catalina"
          group="Custom"
          type="com.example.mbean.HelloMBean">

         <operation name="sayHello"
                     description="Saying Hello"
                        impact="ACTION" returnType="void">
          </operation>
</mbean>
</mbeans-descriptors>


All the above files are in the same package and bundled as jar. I have
tried placing this jar in server\lib directory as well as in a webapp.

Sadly there is very little documentation on how to go about writing a MBean
using this API.

Any help on this would be greatly appreciated.

Thank You!

Regards,
-Yogesh