Exiting gracefully from simpleInitApp()

Troubleshooting General Help
1

Hello,



I would like to stop cleanly if something goes wrong during simpleInitApp().

I have tried stop() → I get ‘java.exe Application Error (…) The memory could not be read’

I have tried stop(true) → loops for ever until I kill the task…

Any idea ?



[java]public void simpleInitApp() {



try {

NeoTextureHelper.loadGraph(“wrong_filename.tgr”);

} catch (FileNotFoundException ex) {

Logger.getLogger(TestNeoTexture.class.getName()).log(Level.SEVERE, null, ex);

stop(); // causes java.exe error

// stop(true); // loops forever…

}[/java]

2

stop() works for me.

Are you running in a canvas by any chance?

3

I am not using canvas, but I could reproduce the problem with a very simple code.

it seems that simpleUpdate() is called at least once when I use stop(); the following code can reproduce the problem if you uncomment started=true :

[java]package mytests;



import com.jme3.app.SimpleApplication;

import com.jme3.renderer.RenderManager;

import com.jme3.scene.Node;

import com.jme3.system.AppSettings;



/**

  • test

    */

    public class TestSimpleAppStop extends SimpleApplication {



    Node neotex_node;

    boolean started = false;



    public static void main(String[] args) {

    TestSimpleAppStop app = new TestSimpleAppStop();

    app.start();

    }



    @Override

    public void start() {

    settings = new AppSettings(true);

    settings.setResolution(800, 600);

    setSettings(settings);

    //this.setShowSettings(false); causes a failure… grrr

    super.start();

    }



    @Override

    public void simpleInitApp() {

    // started = true; -> uncomment to reproduce the problem

    stop();

    }



    @Override

    public void simpleUpdate(float tpf) {

    if (started) {

    neotex_node.rotate(0, tpf, 0);

    }

    }



    @Override

    public void simpleRender(RenderManager rm) {

    //TODO: add render code

    }

    }

    [/java]
4

I get

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

java.lang.NullPointerException

at testcases.TestSimpleAppStop.simpleUpdate(TestSimpleAppStop.java:37)

at com.jme3.app.SimpleApplication.update(SimpleApplication.java:248)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:144)

at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:173)

at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:218)

at java.lang.Thread.run(Thread.java:619)[/java]



But that’s because neotex_node is set to null (you haven’t set it to anything in the test)

5

His assumption is that since he’s called stop() that simpleUpdate() won’t be run. Which is logical even if untrue for whatever reason.

6

Yeah, the app exits at the end of the loop, which implies that it runs through it at least once.

7

Yes, stop doesn’t immediately shut down the application. The whole loop must run at least once after the stop request is made …