Thread: How to Use Instrumentation API

Hi
I want to check the memory allocation of my objects. As far as I know that java has a concept of agent which need to be passed to the JVM during startup.
Well I'm trying to use an API viz. classmexer which need to be passed to jvm as described there.
I did all those things as told ( so far the notion I have is I need to create a agent so that I can have a instance of instrumentation from JVM).

before I show what I did here are the some facts about my application.

Application server using : Resin 4.0.38
JDK in use : 1.6.10
using ant for build and deployment.
Passing jvm argument in servers config file as below:

Note : able to compile successfully.

HTML Code:

<resin xmlns="http://caucho.com/ns/resin"
       xmlns:resin="http://caucho.com/ns/resin/core">

  <resin:import path="${resin.home}/conf/base.xml"/>

  <cluster id="app-tier">

    <resin:import path="${resin.home}/conf/base-cluster.xml"/>
    <dependency-check-interval>1s</dependency-check-interval>

    <server-default>

      <!--
         - The JVM arguments
        -->
      <jvm-arg>-Xmx512m</jvm-arg>
      <jvm-arg>-Xss1m</jvm-arg>
      <jvm-arg>-Xdebug</jvm-arg>
      <jvm-arg>-XX:MaxPermSize=128m</jvm-arg>
      <jvm-arg>-Dcom.sun.management.jmxremote</jvm-arg>
        <jvm-arg>-javaagent:classmexer.jar</jvm-arg>------------------------>> is the jar file which is located in application's lib folder

when I start my server I get following Error on servers console:

HTML Code:

Error opening zip file or JAR manifest missing : classmexer.jar
Error occurred during initialization of VM
agent library failed to init: instrument

This classmexer.jar contains a manifest file under manifest folder.

all I want is a helping hand to start JVM with this agent!!!
Kiindly tell me where I got it wrong?

Thanking you in advance.

Thank for your wonderful suggestion.

But Question Comes here that we should a article about the instrumentation API available in Java.
What do you say?

I would say, "What's the question?"

Originally Posted by GregBrannon

I would say, "What's the question?"

Sorry Typing mistake.
The Question is :

Should we create an article about the instrumentation API here on JPF?

A tutorial perhaps? Did you have one in mind? Were you offering to post one, or are you looking for one from someone else?