Error at drawing on the C

From	"lrantisi" <lrantisi@THRWHITE.remove-dii-this>
Subject	Error at drawing on the C
Message-ID	<1175391057.060376.127730@y80g2000hsf.googlegroups.com> (permalink)
Newsgroups	comp.lang.java.gui
Date	2011-04-27 15:32 +0000
Organization	TDS.net

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  To: comp.lang.java.gui
I have the following code:

Graphics canvasGraphics
canvasGraphics.drawLine(x, y, 200, 200);

which works fine on a machine. But on another machine, I receive the
following error messages.

===============
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at pan$1.mouseClicked(pan.java:82)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown
Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown
Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)
+++++======================

Why do I get this

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Error at drawing on the C "lrantisi" <lrantisi@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: Error at drawing on t "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000

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