My JFrame appears and disappears

Hello,

I've started a simple java application, it is a JFrame with a JLabel.

so when I execute it (I'm using ant), the JFrame appears and dissapears.

This is my piece of code:

publicclass Isp1extends JFrame{

Isp1()

{

super("Hola");

}

publicvoid inicia(){

JLabel l=new JLabel("HOLA");

this.getContentPane().setLayout(new BorderLayout());

this.addWindowListener(new WindowAdapter(){

publicvoid windowClosing(WindowEvent e)

{

System.exit(0);

}

});

this.getContentPane().add(l, BorderLayout.CENTER);

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE );

}

publicstaticvoid main(String args[]){

Isp1 p=new Isp1();

p.inicia();

p.pack();

p.setVisible(true);

}

}

If I use JDialog everything runs right.

[1801 byte] By [SAKYa] at [2007-11-27 8:07:46]