heipacker

private static Instrumentation instrumentation() {
        ClassLoader mainAppLoader = ClassLoader.getSystemClassLoader();
        try {
            Class<?> javaAgentClass = mainAppLoader.loadClass("com.dlmu.agent.AgentTest");
            Method method = javaAgentClass.getDeclaredMethod("instrumentation", new Class[0]);
            return (Instrumentation) method.invoke(null, new Object[0]);
        } catch (Throwable e) {
            System.out.println("can not get agent class" + e.getStackTrace());
            return null;
        }

heipacker

package com.dlmu.agent;

import java.lang.instrument.Instrumentation;

/**
 * Created by fupan on 16-4-2.
 */
public class AgentTest {

    private static Instrumentation inst = null;

heipacker

hey,hey,hey

heipacker

package com.dlmu.agent.test;

/**
 * Created by fupan on 16-4-2.
 */
public class HelloWorld {

    public static void main(String[] args) {
        System.out.println("hello, world.");
    }