com.sun.tools.attach.AgentInitializationException: Agent JAR loaded but agent failed to initialize
    at sun.tools.attach.HotSpotVirtualMachine.loadAgent(HotSpotVirtualMachine.java:121)
    at com.sun.tools.attach.VirtualMachine.loadAgent(VirtualMachine.java:540)
    at com.company.AgentLoader.AgentLoader(AgentLoader.java:55)
    at com.company.AgentLoader.getPID(AgentLoader.java:27)
    at com.company.MyMainClass.main(MyMainClass.java:10)

public static void AgentLoader(VirtualMachine vm){

        System.out.println("Dynamically loading java agent");

        String agent = "C:/Users/.../JavaAgent.jar";

        try {
            String connectorAddress = vm.getAgentProperties().getProperty(CONNECTOR_ADDRESS);
            if (connectorAddress == null) {
                vm.loadAgent(agent);
                System.out.println("Agent inserted");
            }
            vm.detach();
        }
        catch (Exception e){
            e.printStackTrace();
        }
    }

package com.company;

import java.lang.instrument.Instrumentation;
public class JavaAgent {

    public static void premain (String args, Instrumentation inst) throws Exception{
        agentmain(args, inst);
    }

    public static void agentmain (String args, Instrumentation inst) throws Exception{
        System.out.println("Agent Inserted");
    }

}

Manifest-veriosn: 1.0
Agent-Class: com.company.JavaAgent
Premain-Class: com.company.JavaAgent
Can-Redefine-Classes: true
Can-Retransform-Classes: true
Boot-Class-Path: ../lib/tools.jar