//My Java Class which makes a simple JFrame with a label
//It works fine from within Java

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class JavaClass 
{
    static
    {
        System.loadLibrary( "JavaClass" );
    }
    
    
    private JFrame frame;
    private JLabel label;
 
    public JavaClass() 
    {
        
    }
    
    public native void Call_MakeJFrame();
    
    public void MakeJFrame()
    {
        frame = new JFrame("JFrame Source Demo");
        frame.setSize(512, 512);
        frame.setVisible( true );
        
         //Add a window listner for close button
        frame.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {System.exit(0);}});

        label = new JLabel( "label");
        label.setSize( 100, 50 );
        frame.getContentPane().add(label);   
    }
    
}

//This is my c++ code which is trying to make an instance of JavaClass

#include <iostream>
#include "javaclass.h"
using namespace std;



JNIEXPORT void JNICALL Java_JavaClass_Call_1MakeJFrame(JNIEnv* JEnv, jobject JObj)
{
	//don't need this right now, just look at the main function
}

int main()
{
	JavaVM*				JavaVirtualMachine;
	JNIEnv*				JavaNativeEnvironment;
	JavaVMInitArgs		VirtualMachineInitArgs;
	JavaVMOption		VirtualMachineOptions[1];

	VirtualMachineOptions[0].optionString = "-Djava.class.path=C:\\Documents and Settings\\conway.m\\JavaClassLib\\build\\classes\\";
	VirtualMachineInitArgs.version  = JNI_VERSION_1_6;
	VirtualMachineInitArgs.nOptions = 1;
	VirtualMachineInitArgs.options = VirtualMachineOptions;
	VirtualMachineInitArgs.ignoreUnrecognized = JNI_FALSE;

	JNI_CreateJavaVM( &JavaVirtualMachine, (void**) &JavaNativeEnvironment, &VirtualMachineInitArgs );

	cout << "before FindClass\n";
	
	//crashes here
	jclass JavaClass = JavaNativeEnvironment->FindClass( "JavaClass" );

	cout << "after FindClass\n";

	JavaVirtualMachine->DestroyJavaVM();
	return 0;
}

JavaVMInitArgs vm_args;JNI_GetDefaultJavaVMInitArgs(&vm_args);res = JNI_CreateJavaVM(&jvm,&env,&vm_args);if (res < 0) {  fprintf(stderr, "Can't create Java VM\n");}

set PATH=c:\jdk1.6\jre\bin\client;%PATH%  <-- obviously path to your 1.6 jvm, %PATH% is laststart_jvm.exe   <-- your exe