Hi,

I am trying to find memory used by a class while the application runs. Earlier i tried Classmexer and i received "Agent not initted" errorstack. Now i have written a class with premain() method and using

-javaagent:MyAgent-1.0.jar option in the VM arguments (MyAgent jar is created by me).

Following is the MyAgent class code -

package com.instrument;

import java.lang.instrument.Instrumentation;

public class MyAgent {

     private static volatile Instrumentation globalInstr;

     public static void premain(String args, Instrumentation inst) {

          System.out.println("************************* REACHED PREMAIN *************************");

          globalInstr = inst;

     }    

     public static long getObjectSize(Object obj) {

          if (globalInstr == null){

                    throw new IllegalStateException("Agent not initted");

     }    

     return globalInstr.getObjectSize(obj);

  }

}

Next i could see the text (REACHED PREMAIN) printed in the jboss console, which means jboss is reading MyAgent class. From my application i included MyAgent jar by maven and used MyAgent class in one class of my application as follows -

long l = MyAgent.getObjectSize(this);

LOGGER.debug("SIZE .. " + l);

Still i am receiving "java.lang.IllegalStateException: Agent not initted" error. Actually i need to use classmexer for deepMemoryUsageOf() methods, but even this simple one is also not working. Any help would be appreciated.