Enterprise Client Won't Start Via Java Web Start

Hi all,

I'm trying to make a swing client application packaged inside a ear application archive. For some reason i couldn't figure out i keep getting a null pointer exception right after the download.

I've tried smaller applications and keep getting the same error.

Main.java
====================================================
import javax.swing.JOptionPane;

import yat.Session;

public class Main {

public static void main(String[] args) {
JOptionPane.showMessageDialog(null, "Hello");
}

public Main() {
super();
}

}
====================================================

java.lang.NullPointerException
at java.io.StringReader.(StringReader.java:50)
at org.glassfish.appclient.client.JWSAppClientContainerMain.insertMaskingLoader(JWSAppClientContainerMain.java:186)
at org.glassfish.appclient.client.JWSAppClientContainerMain.main(JWSAppClientContainerMain.java:132)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.sun.javaws.Launcher.executeApplication(Unknown Source)
at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Thread.java:744)