NullPointerException « Graphics « Java Swing Q&A

  1. Java Swing Q&A
  2. Graphics
  3. NullPointerException




1. sun.awt.RepaintArea.paint (java.Lang.NullPointerException)    stackoverflow.com

I haven't posted any code because I don't even know where to begin. The exception shown below occurs twice after I call setVisible(true) on my JFrame and then never again. That's ...

2. NullPointerException when trying to paint    java-forums.org

I have a little program i'm workin on, and it keeps complaining about nullPointerExceptions. Also, every once in a while, the program just draws a white screen instead of what i want it to print. Exception in thread "main" java.lang.NullPointerException at Cell.draw(InitClass.java:206) at MyGrid.drawCells(InitClass.java:125) at MainClass.(InitClass.java:40) at InitClass.main(InitClass.java:11) Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at MyPanel.paint(InitClass.java:87) at javax.swing.JComponent.paintChildren(Unknown Source) at javax.swing.JComponent.paint(Unknown Source) ...

3. Graphics Giving me NullPointerException in my swings program    forums.oracle.com

Ok let me re-specify my problem. I want to accept an image, calculate its histogram and then draw the histogram on an image (i start by creating a blank image of size 320 by 240). Then i want to put that image using imageIcon onto my panel. Please tell me how to go about doing this. I am still a java ...