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I have a NullPointerException error that I dont understand
I get an error that I cant seem to fix. I have a lot of code, so ask me for each individual class.
Error:
Exception in thread "Thread-3" java.lang.NullPointerException at com.riddlekeys.src.gfx.SpriteSheet.crop3(SpriteSheet.java:29) at com.riddlekeys.src.gfx.ImageManager.<init>(ImageManager.java:177) at com.riddlekeys.src.Game.init(Game.java:173) at com.riddlekeys.src.Game.run(Game.java:235) at java.lang.Thread.run(Unknown Source)
Thanks!
Luke
Last edited by LukeR; December 26th, 2013 at 06:10 PM. Reason: I failed xD
Related threads:
Re: I have a NullPointerException error that I dont understand
There is a variable with a null value on line 29. Look at line 29 in the your source and see what variable is null. Then backtrack in the code to see why that variable does not have a valid value.Exception in thread "Thread-3" java.lang.NullPointerException
at com.riddlekeys.src.gfx.SpriteSheet.crop3(SpriteShe et.java:29)
If you can not tell which variable it is, add a println just before line 29 and print out the values of all the variables on that line.
If you don't understand my answer, don't ignore it, ask a question.
LukeR (December 14th, 2013)
Re: I have a NullPointerException error that I dont understand
Ok thanks, will try that. If it doesnt work I will get back to you.There is a variable with a null value on line 29. Look at line 29 in the your source and see what variable is null. Then backtrack in the code to see why that variable does not have a valid value.Exception in thread "Thread-3" java.lang.NullPointerException at com.riddlekeys.src.gfx.SpriteSheet.crop3(SpriteSheet.java:29)
If you can not tell which variable it is, add a println just before line 29 and print out the values of all the variables on that line.
-Luke
--- Update ---
I tried it, but I cant seem to find what is causing it. Could I send you source some how?
-Luke
Re: I have a NullPointerException error that I dont understand
Post the code you added with the println() and the line with the error. Also post what the println() printed out.
If you don't understand my answer, don't ignore it, ask a question.
Re: I have a NullPointerException error that I dont understand
I cant, because it is a class that only runs methods, and the variables are type BufferedImage.Originally Posted by Norm
(What I mean by that is that it is the type: int, boolean ect. IE:public static BufferedImage exampleVariable;
Re: I have a NullPointerException error that I dont understand
What do you expect anyone can do with that?
What code is on line 29?
What was printed out by the println you added?
If you don't understand my answer, don't ignore it, ask a question.
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