Cannot Attach to JVM using jdk 1.5

I have a java application that must run with jdk 1.5. I need a way to attach to this application JVM using its PID.
I tried ByteBuddy library but it is giving me the following error when trying to load the agent.

Exception in thread "main" java.lang.IllegalStateException: Target could not dispatch command successfully
at net.bytebuddy.agent.VirtualMachine$ForHotSpot$Connection$ForJnaWindowsNamedPipe.execute(VirtualMachine.java:1043)
at net.bytebuddy.agent.VirtualMachine$ForHotSpot.load(VirtualMachine.java:361)
at net.bytebuddy.agent.VirtualMachine$ForHotSpot.loadAgent(VirtualMachine.java:335)
at main.Agent.main(Agent.java:28)

Here's the code in the main method:

public static void main(String[] args) {
	try {
		VirtualMachine vm = VirtualMachine.ForHotSpot.attach("19708");
		vm.loadAgent("Agent.jar");
		vm.detach();
	} catch (IOException e) {
		System.out.println(e.getMessage());
	}
}

Can anyone help me with this issue?

The Attach API was introduced in JDK 6. You find it in package com.sun.tools.attach, which is unavailable in JDK 5. Also the corresponding library jre/lib/.../libattach.so (UNIX-like OS) or jre/bin/attach.dll (Windows) is unavailable in your JDK folder, if you want to compare JDK 5 against 6+. Hence, you cannot hot-attach an agent with this method to a Java 5 VM. Maybe you could run your Java 5 application on a Java 6+ VM and then attach to that one.

P.S.: You don't need ByteBuddy in order to hot-attach an agent, see this tutorial:

import com.sun.tools.attach.AgentInitializationException;
import com.sun.tools.attach.AgentLoadException;
import com.sun.tools.attach.AttachNotSupportedException;
import com.sun.tools.attach.VirtualMachine;

import java.io.File;
import java.io.IOException;

class Scratch {
  public static void main(String[] args) throws IOException, AttachNotSupportedException, AgentLoadException, AgentInitializationException {
    VirtualMachine jvm = VirtualMachine.attach("22384");
    jvm.loadAgent(new File("foo.jar").getAbsolutePath());
    jvm.detach();
  }
}

When running this against a program running in a Java 5 VM, you will also see a more specific error message:

Exception in thread "main" com.sun.tools.attach.AttachNotSupportedException: The VM does not support the attach mechanism
	at sun.tools.attach.HotSpotAttachProvider.testAttachable(HotSpotAttachProvider.java:162)
	at sun.tools.attach.WindowsAttachProvider.attachVirtualMachine(WindowsAttachProvider.java:67)
	at com.sun.tools.attach.VirtualMachine.attach(VirtualMachine.java:208)
	at Scratch.main(scratch.java:11)

From the stack trace, I can see that you are using VirtualMachine$ForHotSpot$Connection$ForJnaWindowsNamedPipe. This means Byte Buddy is emulating the attachment for you using JNA. While this is possible in Java 5 which does not offer an attachment provider, the target VM must be of at least version 6 where dynamic attachment was introduced to dispatch the command to attach.

It is not possible to attach to a version 5 VM, only from one if JNA is available.