Call Java/Swing from C++/Qt with JNI - requires Oracle Java 7u4 or OpenJDK 7u3 (or higher)

CreateAndShowGUI.java

import java.lang.reflect.InvocationTargetException;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;


public class CreateAndShowGUI extends Thread{
	Runnable HelloWorldFrame = new Runnable() {
        public void run() {
        	//Make sure we have nice window decorations.
            JFrame.setDefaultLookAndFeelDecorated(true);

            //Create and set up the window.
            JFrame frame = new JFrame("HelloWorldSwing");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            //Add the ubiquitous "Hello World" label.
            JLabel label = new JLabel("Hello World");
            frame.getContentPane().add(label);

            //Display the window.
            frame.pack();
            
            frame.setVisible(true);	
        }
    };
    
	public void run(){
    	
        try {
                        // Being Swing good citizens
			SwingUtilities.invokeAndWait(HelloWorldFrame);
		} catch (InvocationTargetException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    }

}

HolaMundoSwing.java

public class HolaMundoSwing {
    
    public static void main(String[] args) {
        CreateAndShowGUI t1=new CreateAndShowGUI();
        t1.start();
        try {
			t1.join();//is more important synchronize the main thread with the gui thread 
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
        
    }
}

main.cpp

#include "jvm.h"

Jvm::Jvm(){
}
void Jvm::create_jvm(){
    JavaVM *jvm;
    JNIEnv *env;
    JavaVMInitArgs vm_args;
    JavaVMOption options[3];
    //jvm options
    options[0].optionString = "-Djava.compiler=NONE";
    options[1].optionString = "-Djava.class.path=./javaApp";
    options[2].optionString = "";//other options example -verbose:jni
    //jvm args
    vm_args.version = JNI_VERSION_1_6;
    vm_args.nOptions = 3;
    vm_args.options = options;
    vm_args.ignoreUnrecognized = JNI_TRUE;

    jint res = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
    if (res < 0) {
        qDebug()<<"Can't create Java VM\n";
        exit(1);
    } else {
        invoke_class(env);
        jvm->DestroyJavaVM();
    }
}

void Jvm::invoke_class(JNIEnv* env) {
    jclass cls;
    jmethodID mainMethod;
    jobjectArray applicationArgs;
    jstring applicationArg0,applicationArg1,applicationArg2;

    //class and main method
    cls = env->FindClass("HolaMundoSwing");//HolaMundoSwing is the name of the class
    if (cls == 0) qDebug()<<"Sorry, I can't find the class";

    mainMethod = env->GetStaticMethodID(cls, "main", "([Ljava/lang/String;)V");//main is the name of the method

    //Application arguments array
    applicationArgs = env->NewObjectArray(3, env->FindClass("java/lang/String"), NULL);
    applicationArg0 = env->NewStringUTF("From");
    applicationArg1 = env->NewStringUTF("C");
    applicationArg2 = env->NewStringUTF("program");

    env->SetObjectArrayElement(applicationArgs, 0, applicationArg0);
    env->SetObjectArrayElement(applicationArgs, 1, applicationArg1);
    env->SetObjectArrayElement(applicationArgs, 2, applicationArg2);

    env->CallStaticVoidMethod(cls, mainMethod, applicationArgs); //Call to the method
}

What does

Jvm::Jvm(){
}

do?

hum, don't work on my side. Maybe because jvm.h is missing ? I'm not able to fix my problem, if you have it somewhere... It could be cool. It's a really interesting issue.