assetManager in a class not extending Application

Troubleshooting import-assets
1

Hello, I’m new to the forum and obviously new to the jMonkeyEngine3. If that matters, I’m using the nightly builds.



The problem is as in the title: the same line that works in Main doesn’t in a different class. I have an AssetManager field but the line



[java]Material mat = new Material(assetManager, “Common/MatDefs/Misc/SimpleTextured.j3md”);[/java]



throws a NullPointerException. What should I do?



Thanks in advance.

2

could you post the complete stack trace please?

This line can hardly throw that kind of exception.

3

Yup, sorry for not posting it in my previous post, I thought it was some kind of common noob mistake:



2011-02-20 11:22:50 com.jme3.app.Application handleError

SEVERE: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]

java.lang.NullPointerException

at com.jme3.material.Material.(Material.java:166)

at mygame.Cor.makeWall(Cor.java:52)

at mygame.Cor.r(Cor.java:40)

at mygame.Main.simpleInitApp(Main.java:36)

at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:218)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.initInThread(LwjglAbstractDisplay.java:136)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:193)

at java.lang.Thread.run(Thread.java:619)

4

ok you assetManager is null.

where do you call it? do you use SimpleApplication?

5

No, my assetManager is in the class Cor that doesn’t extend anything. I guess I should use assetManager.registerLocator(); but I’m not sure what are those parameters it takes.

6

no you should pass the assetManager to the Cor class from the simpleApplication.

what do you do then?

AssetManager assetManager;

Material mat = new Material(assetManager, “Common/MatDefs/Misc/SimpleTextured.j3md”);

???

1 Like
7

I used this method getAssetManager(); and made a new method that returned assetManager but both gave me the same stack trace.

8

If you just put a field there its null. You have to assign a value to it… So in the constructor of the class you go something like:

[java]

public MyClass(AssetManager manager){

this.assetManager=manager;

}

[/java]

1 Like
9

Thanks guys, it’s working now!