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  have a  running  Exception  (Read 934 times)
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Offline yy

Junior Newbie




Java games rock!


« Posted 2004-04-07 09:12:02 »

when   it   run,it  say   Exception    following:
    java.lang.NullPointerException

at javax.microedition.lcdui.game.Sprite.<init>(+17)
at myprojectb.MyGameWithSpriteCanvas1.createCharacter(+37)

     at myprojectb.MyGameWithSpriteCanvas1.<init>(+48)

     at myprojectb.MyGame.startApp(+15)

     at javax.microedition.midlet.MIDletProxy.startApp(+7)

     at com.sun.midp.midlet.Scheduler.schedule(+270)

     at com.sun.midp.main.Main.runLocalClass(+28)

     at com.sun.midp.main.Main.main(+116)


why?
Offline shmoove

Junior Member




Doh!


« Reply #1 - Posted 2004-04-07 13:29:19 »

Why? Because you have some null object when you call the Sprite constructor. Looking at the Sprite documentation, a NullPointerException is thrown from the constructor because either the image for the sprite is null, or in the case of the copy constructor the other sprite is null.

shmoove
Offline wooD

Senior Newbie




J2ME Developer


« Reply #2 - Posted 2004-04-07 15:02:59 »

Strart by puting a bunch of System.out.printlns in your

myprojectb.MyGameWithSpriteCanvas1.createCharacter(+37)

method.  This is one of the only ways I find null variables and exceptions. I've found debuggers to be less than adequate, but it's been a while since I used one with J2ME, maybe they've improved?

Wood

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