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Thread: How to Use Instrumentation API

  1. #1
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    Question 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.


  2. #2
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    Default Re: How to Use Instrumentation API

    I don't know anything about this agent stuff you're talking about, but if you want to analyze the memory usage of your program, I recommend using eclipse's memory analyzer tool: Eclipse Memory Analyzer Open Source Project
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  3. The Following User Says Thank You to KevinWorkman For This Useful Post:

    arvindbis (September 5th, 2014)

  4. #3
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    Default Re: How to Use Instrumentation API

    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?

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    Default Re: How to Use Instrumentation API

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

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