a jar problem

well, I'm facing a problem with my jar

I was creating a digital clock application , I used the class loader to load a font that is not rgestered with my system and it runs perfectly from the netbeans , but when I build the jar it doesn't work as it says that there is a NullPointerException as the jar couldn't Identify my new font,please help me.

public Display(){

super("Digital Clock");

ClassLoader cl =ClassLoader.getSystemClassLoader();

is = cl.getResourceAsStream("Font/DIGITALDREAM.ttf");

try{

font = Font.createFont(java.awt.Font.TRUETYPE_FONT, is);//here the problem goes

}catch(Exception e){}

font=font.deriveFont(Font.BOLD,20f);

[1078 byte] By [mohamad.atef.khafagaa] at [2007-11-27 11:52:00]