java.lang.NullPointerException Error with Slick

Question

EDIT: I FIXED IT MYSELF. At the end if both classes, I typed

Return 0;

Menu should be 0 and Play should be 1 so I fixed it

You may need to initialize the `gc`s in you `init` methods. – Paul Samsotha Dec 18 '13 at 01:44 — Paul Samsotha, Dec 18 '13 at 01:44

score 0 · Answer 1 · edited May 23 '17 at 12:19

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The problem happens at javagame.Game.initStatesList(Game.java:19). I don't know which line that is from your code, but NullPointerException happens when you try to access members of a reference variable that wasn't previously allocated.

edited May 23 '17 at 12:19

Community

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answered Dec 18 '13 at 01:42

karlphillip

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`this.getState(play).init(gc, this);` this is the line the error happens at – user3113450 Dec 18 '13 at 01:48

score 0 · Answer 2 · answered Dec 18 '13 at 01:48

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You're passing gc to your init method:

this.getState(menu).init(gc, this);
this.getState(play).init(gc, this);

But in your init methods, you don't do anything with them

public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{
}

You may want to instantiate them in the method

answered Dec 18 '13 at 01:48

Paul Samsotha

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I'm sorry, I'm new to java, how do you instantiate them in the method? – user3113450 Dec 18 '13 at 02:04

java.lang.NullPointerException Error with Slick

2 Answers2