App.start error

[TecnaGammer]

help i dount know what is wrong the code with app.start has an error and i tried for a week to fix it but i havent gotten anyware plz help me

[pspeed]

just fix. the error. or provide. more info

[TecnaGammer]

is this enough info

package mygame;

import com.jme3.app.SimpleApplication;
import com.jme3.input.KeyInput;
import com.jme3.input.MouseInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.AnalogListener;
import com.jme3.input.controls.KeyTrigger;
import com.jme3.input.controls.MouseButtonTrigger;
import com.jme3.input.controls.Trigger;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;

/** Basic jMonkeyEngine game template. */

class UserInput {

private final static Trigger TRIGGER_COLOR =
new KeyTrigger(KeyInput.KEY_SPACE);
private final static Trigger TRIGGER_ROTATE =
new MouseButtonTrigger(MouseInput.BUTTON_LEFT);
private final static String MAPPING_COLOR = “Toggle Color”;
private final static String MAPPING_ROTATE = “Rotate”;
private final static Trigger TRIGGER_COLOR2 =
new KeyTrigger(KeyInput.KEY_C);
public UserInput() {

    }

public class Main extends SimpleApplication {

UserInput app = new UserInput();

@Override
/** initialize the scene here */
public void simpleInitApp() {

    
    inputManager.addMapping(MAPPING_COLOR, TRIGGER_COLOR,
TRIGGER_COLOR2);
    inputManager.addMapping(MAPPING_ROTATE, TRIGGER_ROTATE);

inputManager.addListener(actionListener,
new String[]{MAPPING_COLOR});
inputManager.addListener(analogListener,
new String[]{MAPPING_ROTATE});
// create a cube-shaped mesh
Box b = new Box(Vector3f.ZERO, 1, 1, 1);
// create an object from the mesh
Geometry geom = new Geometry(“Box”, b);

   // create a simple blue material
   Material mat = new Material(assetManager,
           "Common/MatDefs/Misc/Unshaded.j3md");
   mat.setColor("Color", ColorRGBA.Blue);      
   // give the object the blue material
   geom.setMaterial(mat);
   // make the object appear in the scene
   rootNode.attachChild(geom);
}

   private final ActionListener actionListener = new ActionListener() {

@Override
public void onAction(String name, boolean isPressed, float tpf) {
System.out.println("You triggered: "+name);
}
};
private final AnalogListener analogListener = new AnalogListener() {
@Override
public void onAnalog(String name, float intensity, float tpf) {
System.out.println("You triggered: "+name);
}
};

@Override
/** (optional) Interact with update loop here */
public void simpleUpdate(float tpf) {}

@Override
/** (optional) Advanced renderer/frameBuffer modifications */
public void simpleRender(RenderManager rm) {}

‘’’
public static void main(String[] args) {
Main app = new Main();
‘’’
app.start();
}

}

}

[pspeed]

(says they got an error… doesn’t say what the error is.)

Walks into mechanic: “Hello, my car at home is broken can you tell me what’s wrong?”

We will need to know something about what is wrong to help with fixing what is wrong.

Also, you might look at the post about how to format code blocks to help people read your code.

How to type code blocks

Markdown code block : Embed your code in 3 backticks, like this ```<optional language> //your code here ``` If you don’t know how to type a backtick, here are some related links : How to type a backtick on windows For mac users : On qwerty keyboards it’s the key right to the left shift (along with the " key). On azerty keyboards it’s the key over the right shift (along with the £ key). This uses highlight.js, but uses a subset of the supported langages (following code block uses java)…

[TecnaGammer]

k i put the ‘’’ exactlay ware the errors are also i am still learning code

[pspeed]

WHAT IS THE ERROR?!?!?!?!?

Like. WHAT is it. Not WHERE is it. WHAT is it.

Just “error”?

I don’t think so.

What is the error. The error that happens. What is the information about the error? The error that happens has some information. It doesn’t just say “error”.

What is it?

[TecnaGammer]

the program fails to start

[TecnaGammer]

and the consol says this

run:
Error: Could not find or load main class mygame.Main
/Users/########/Library/Application Support/jmonkeyplatform/v3.2.0-prealpha-sdk1/var/cache/executor-snippets/run.xml:53: Java returned: 1
BUILD FAILED (total time: 1 second)

[pspeed]

@TecnaGammer

and the consol says this

run:

Error: Could not find or load main class mygame.Main

/Users/########/Library/Application Support/jmonkeyplatform/v3.2.0-prealpha-sdk1/var/cache/executor-snippets/run.xml:53: Java returned: 1

BUILD FAILED (total time: 1 second)

AHAH!!! The error! Right there.

Could not find or load main class mygame.Main

You do not have a class named Main in the package mygame. Either reconfigure the project to point to the right class or relocate/rename your package/class.

You are perhaps still too early in your Java programming learning to start with something as advanced as 3D game programming. Do some tutorials. Write some simpler things.

[TecnaGammer]

thats the problem IT’S IN THE RIGHT FOLDER

[TecnaGammer]

This is the problem

[pspeed]

Yes, but that class has errors in it.

Anyway, if you create a new game template based project and hit run then it should run. If not then your SDK is messed up.

If you create a new game template based project and modify it and it doesn’t run then your modifications are busted.

You keep posting follow ups… your code clearly has compile errors. Yet you don’t even tell us what the compile errors are. I’m not sure we can help you because you are basically helpless.

[Ogli]

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package mygame;

import com.jme3.app.SimpleApplication;
import com.jme3.input.KeyInput;
import com.jme3.input.MouseInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.AnalogListener;
import com.jme3.input.controls.KeyTrigger;
import com.jme3.input.controls.MouseButtonTrigger;
import com.jme3.input.controls.Trigger;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.jme3.renderer.RenderManager;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;

/** Basic jMonkeyEngine game template. */
public class Main extends SimpleApplication {

    public static class UserInput {
        private final static Trigger TRIGGER_COLOR =
        new KeyTrigger(KeyInput.KEY_SPACE);
        private final static Trigger TRIGGER_ROTATE =
        new MouseButtonTrigger(MouseInput.BUTTON_LEFT);
        private final static String MAPPING_COLOR = "Toggle Color";
        private final static String MAPPING_ROTATE = "Rotate";
        private final static Trigger TRIGGER_COLOR2 =
        new KeyTrigger(KeyInput.KEY_C);
        public UserInput() {
        }
    }
    
    UserInput ui = new UserInput();

    /** initialize the scene here */
    @Override
    public void simpleInitApp() {
        inputManager.addMapping(UserInput.MAPPING_COLOR, UserInput.TRIGGER_COLOR,
            UserInput.TRIGGER_COLOR2);
        inputManager.addMapping(UserInput.MAPPING_ROTATE, UserInput.TRIGGER_ROTATE);

        inputManager.addListener(actionListener,
        new String[]{UserInput.MAPPING_COLOR});
        inputManager.addListener(analogListener,
        new String[]{UserInput.MAPPING_ROTATE});
        // create a cube-shaped mesh
        Box b = new Box(Vector3f.ZERO, 1, 1, 1);
        // create an object from the mesh
        Geometry geom = new Geometry("Box", b);

        // create a simple blue material
        Material mat = new Material(assetManager,
                "Common/MatDefs/Misc/Unshaded.j3md");
        mat.setColor("Color", ColorRGBA.Blue);      
        // give the object the blue material
        geom.setMaterial(mat);
        // make the object appear in the scene
        rootNode.attachChild(geom);
    }

    private final ActionListener actionListener = new ActionListener() {
        @Override
        public void onAction(String name, boolean isPressed, float tpf) {
            System.out.println("You triggered: "+name);
        }
    };
    
    private final AnalogListener analogListener = new AnalogListener() {
        @Override
        public void onAnalog(String name, float intensity, float tpf) {
            System.out.println("You triggered: "+name);
        }
    };

    /** (optional) Interact with update loop here */
    @Override
    public void simpleUpdate(float tpf) {}

    /** (optional) Advanced renderer/frameBuffer modifications */
    @Override
    public void simpleRender(RenderManager rm) {}

    public static void main(String[] args) {
        Main app = new Main();
        app.start();
    }
}

This should compile and run.

You better first learn how to write Java code.

[pspeed]

@TecnaGammer

UserInput app = new UserInput();

A wild guess is that because you have no idea what you are doing then you are naming things “whatever random thing occurs to you” like calling your user input object “app” and that is confusing the compiler.

…which we could have told you right away if the first thing you posted was the compile error you got.

[zissis]

As I posted in Slack today … noobs need to learn how to crawl before they try to fly … it’s the endless problem with noobs in technology

Cut and paste is NOT your friend my padawan

[mack0929]

You know you either probably have two SDK’s on your computer and don’t even know it…Because I dealt with the same thing months ago whenever I had to redownload jmonkey and netbeans. … just delete one of them and reinstall if it still does those “errors”
OR… you could change your code of the actionlistener to…

private ActionListener actionListener = new ActionListener({
public void onAction(String name,boolean isPressed,float tpf){
//insert beat up code
});
}

[pspeed]

His issue is that he doesn’t know what a compile error is, how to read it, or what to do about it. It’s not really an SDK problem as it turns out. Just an operator problem.

[mack0929]

That ActionListener code is right tho…right?

[pspeed]

@TecnaGammer

UserInput app = new UserInput();

@TecnaGammer

Main app = new Main();

The fact that both of those had the same name is probably the real issue… and the compiler was probably saying exactly that.

[Ogli]

The problem were simple syntax errors. I just renamed that to “ui” because that makes way more sense than being named “app”, but that wasn’t the issue. There are still things in the code that are useless / unnecessary though.

Well, I’m not a big Know-it-all about Java, but more of an intermediate user. But it was easy for me to see the errors, and with the help of NetBeans I didn’t even have to think too much. But I can understand, that an absolute beginner was not able to make something of the compiler error message - since those can be kind of cryptic.