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[java] NullPointer in App

Started by Sir Sapo Jul 11, 2004 at 2:04 AM 3 replies 500+ views

Original Post

Jul 11, 2004 at 2:04 AM

I have an applet program that loads images and displays them using AWT. It works as an applet but when I put a main method in my applet , and chose to run it as an application, I get an error that says I have a null pointer exception when I try to use getDocumentBase() for my images. Does anyone know why this is happening or do I have to include some code snippets to help get my problem across?

etothex

Jul 11, 2004 at 6:32 AM

NullPointerExceptions can occur when you initialize a class to null, but then don't use the new operator or a factory to make a real instance. I imagine you could be doing this:

class FunkeyApplet extends Applet { //...}FunkeyApplet applet = null;//...//function assumes applet = new FunkeyApplet(); has been called, //but it hasn't, so applet == nullapplet.getDocumentBase();

If you're not doing this, then post some snippets of the lines around the call to getDocumentBase()

Sir Sapo

Jul 11, 2004 at 3:28 PM

Sorry that anonymouse post was me , I forgot to log in

Sir Sapo

Jul 11, 2004 at 5:32 PM

I figured out how to do it,

I made a method called loadImage that returned an ImageIcon with from the specified filename.

Thanks for your help.

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