Deployment problems that I don't know how to fix or trace - Please Help

Question

I have made a javafx application in netbeans where I import classes from the java library (specifically ones from java.io for writing/readning files). The program works great in the IDE, reading and writing files, but when I build it and run the .jnlp, It does not write any files or do anything that requires any of the imported functions. I have been trying for a few weeks now and have had no luck. The same thing happens when I create a brand new javafx desktop application and try to make it write a simple text file.
My questions are these:
1. Does someone know if I'm missing something? I tried checking the box that makes it a self signed jar and pack200 compression, no luck. This program is for running locally on the user's machine.
2. I do not no how to check for exception traces the application may have thrown. I am using Mac OSX 10.6.6, and the latest Java and Netbeans. Can someone help me with this?
My deadline is coming up and I don't want to rewrite the whole thing using something else. I was pleased with this javafx application until now. Please Help
here is my test .fx file
package savetest;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.File;
import java.io.IOException;
import javax.swing.JFileChooser;
public class Main {
    // <Generated Code by netbeans (unaltered or edited for this test)>
function writeData(source : java.net.URI) {
        var output: BufferedWriter;
        try {
            def text = "Test Data";
            def file = new File(source);
            output = new BufferedWriter(new FileWriter(file));
            output.write(text);
            output.flush();
            output.close();
        } catch (e: IOException) {
            e.printStackTrace();
function run (): Void {
    var design = Main {};
    var fileChooser : JFileChooser = new JFileChooser;
    var goalURI : java.net.URI;
    javafx.stage.Stage {
        title: "Main"
        scene: design.getDesignScene ()
     if (fileChooser.APPROVE_OPTION == fileChooser.showSaveDialog(null)) {
       goalURI = fileChooser.getSelectedFile().toURI();
    writeData(goalURI);
}

Answer 1

Hello user,
You can see the traces of your application from java console which will automatically appears when your application is running on browser. In MAC OSX the java console icon appears at top right bottom (tray icon) and you can view the console from their.
Please trace the exception what you have got so that we could find the real problem.
Thanks,
narayan