[LibGDX] NullPointerException and batch

[Cinem]

Hi  

I'm trying to make a simple tile mapping but I have a problem with the rendering. I have a NullPointer exception

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Caused by: java.lang.NullPointerException    at Map.render(Map.java:51)    at .render(LabC.java:47)

I use 3 classes :
- Block => Each Tile
- Map => two dimensional "Block" array
- LabC => The main class

For rendering one Block I use this function:

Block.java:

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public void render(){ // "sprite" is a Sprite object for Texture, position ... of the Tile.       sprite.draw(LabC.batch);    }

To display all tiles I use this function:
Map.java

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public void render(){       for(int y = 0;y < map.length; y++){          for(int x =0;x < map[1].length; x++){             blockmap[x][y].render();          }       }    }

And the render method :

LaboC.java

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public static SpriteBatch batch; ... public void render() {             Gdx.gl.glClearColor(0, 0, 0, 1);       Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);       batch.setProjectionMatrix(camera.combined);             batch.begin();       test.render(); //"test" is a Map object       batch.end();    }

Thx for the help

[alaslipknot]

it must be an initialization problem, make sure you initialize all your variable before using them .
good luck

[Jimmt]

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public void render(){ // "sprite" is a Sprite object for Texture, position ... of the Tile.       LabC.batch.begin();       sprite.draw(LabC.batch);       LabC.batch.end();    }

That's your solution, I'm pretty sure. I'm not too keen on your use of statics for this, but I think that should work.

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[Longarmx]

Make sure you initialize everything in the create() method instead of statically in the class "header".

[ReBirth]

Full code of LabC class.

[heisenbergman]

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public void render(){ // "sprite" is a Sprite object for Texture, position ... of the Tile.       LabC.batch.begin();       sprite.draw(LabC.batch);       LabC.batch.end();    }

That's your solution, I'm pretty sure. I'm not too keen on your use of statics for this, but I think that should work.

Would passing an instance of Map (or maybe just blockmap[][]) to LaboC so it could be rendered there be a better solution (given of course that it makes sense considering the TS's code overall)?

[Cinem]

I fix my problem !
Appently my inititalization wasn't good
Thx for the help