UISpec4J and external application

I am trying to launch an external application for testing using UISpec4J.

Here are the questions and their answers I referred so far:

How to automate a swing java web start application which runs clicking a link into a web application, which is automated with Selenium WebDriver?

Getting all windows using UISpec4J

UISpec4J Capturing modal dialog, before the trigger finish

my.exe referred below is a Java application wrapped in exe using some tool. Internally it uses the jars and is Java GUI application.

Based on these questions I have come up with following code fragments:

        this.setAdapter(new UISpecAdapter() {
        @Override
        public Window getMainWindow() {
            return WindowInterceptor.run(new Trigger() {
                @Override
                public void run() throws Exception {
                    // running jnlp by netx launcher 
                    Runtime.getRuntime().exec("C:\\my.exe"); 
                    Thread.sleep(10000);
                }
            });
        }
    });

In the approach above I simple get "No window was shown" error.

        this.setAdapter(new UISpecAdapter() {
        @Override
        public Window getMainWindow() {
            final Window[] result = new Window[1];
            WindowInterceptor
            .init(new Trigger() {
                @Override
                public void run() throws Exception {
                    Runtime.getRuntime().exec("C:\\my.exe"); 
                    //Thread.sleep(10000);
                }
              })
              //.processTransientWindow()
              .process(new WindowHandler() {
                    public Trigger process(Window window) throws Exception {
                    result[0] = window;
                    return Trigger.DO_NOTHING;
                    }
                })
            .run();
            return result[0];
        }
    });     

In the second approach above, I still get "No window shown" error AND control never reaches to overriden "process" method.

From the first question I referred, mentioned above, we should be able to do that because the answer to it mentions launching jnlp application which is external application.

I tried with jre 6 update 0 and I can at least run test. In java update 37, from the third question I referred above, I get abstract method not implemented error.

What am I doing wrong? Any idea?

I am using latest UISpec4J package - version 2.4.

Thanks in advance, -Neel.