Re: can't create BufferedImage

I am trying to create a BifferedImage and Graphics2D associated with a
JPanel. I understand that the JPanel must be displayable else the
createImage method may return null. However in my stub program below I
always get null returned from createGraphics. I obviously am missing
something but I can't figure out what. If the program below is run without
a runline parameter it does not attempt to create a BufferedImage and it
runs OK. If it is run with a runline parameter it throws an exception
because bh is null. Why?

public class Test extends javax.swing.JFrame {

   public Test() {
      init();
   }

   void init() {
         java.awt.image.BufferedImage bh =
            (java.awt.image.BufferedImage)graphPanel.createImage(
            s.width, s.height);
   }

   public static final void main(String[] argv) {
      Test test = new Test();
      test.setVisible(true);
   }
}