JFrame "Hello World" hangs for no apparent reason...

Question

Not completely new to Java, I decided to pick it up again after some years away from it. To my surprise I'm not able to run the most simple examples on my Ubuntu 7.10 using Eclipse as IDE.
Here's my jre
auditor@mymachine:~/workspace/hello/src$ java -version
java version "1.5.0"
gij (GNU libgcj) version 4.2.1 (Ubuntu 4.2.1-5ubuntu5)
and my compiler:
auditor@mymachine:~/workspace/hello/src$ javac -version
Eclipse Java Compiler v_774_R33x, 3.3.1, Copyright IBM Corp 2000, 2007. All rights reserved.
My program goes as:
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Dimension;
public class hello {
    private static void initMainWindow() {
        //Create and set up the window.
        JFrame frame = new JFrame("FrameDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JLabel helloLabel = new JLabel("Hello world", JLabel.CENTER);
        helloLabel.setPreferredSize(new Dimension(175, 100));
        frame.getContentPane().add(helloLabel);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
    public static void main(String[] args) throws
    ClassNotFoundException {
         //Opens main window
         javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                 initMainWindow();
}and it compiles fine - even no warnings. :) To my disbelief the program starts, but quite soon (2 sec's or so) it refuses to repaint after resize, and certainly won't close when I click the close icon.
When I run it from Eclipse, though, the program doesn't seem to hang as badly as first suspected. It behaves as if I ran it from a terminal, but I can terminate the execution without error from Eclipse. So there's still some connection with the program, it seems.
Any ideas what's going on?
Thanks!

Answer 1

Thanks for your reply, sabre150.
Following
http://ubuntuforums.org/showthread.php?t=201378
resolves the problem (in terminal), though I still can't force Eclipse to use this environment.