Cannot find or load main class ERROR

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Error: Could not find or load main class

ive been working on some game code for a few hours now and it worked perfectly fine before, but then my eclipse decided to corrupt some stuff, I recovered it fully and it works perfectly in eclipse but when I try to run it via CMD or just as an Executable JAR I get Cannot find or load main class ERROR. Here is the current main method I have.

public Game() {
    setMinimumSize(new Dimension(WIDTH * 2, HEIGHT * 2));
    setMaximumSize(new Dimension(WIDTH * 2, HEIGHT * 2));
    setPreferredSize(new Dimension(WIDTH * 2, HEIGHT * 2));
    frame = new JFrame(NAME);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());
    frame.add(this, BorderLayout.CENTER);
    frame.pack();
    frame.setResizable(false);
    frame.setLocationRelativeTo(null);
    frame.setVisible(true);
    frame.setIconImage(Icon);
}

private boolean running = false;
public InputHandler Inputs = new InputHandler(this);

public static void main(String[] args) {
    System.out.println("Starting");
    Game g = new Game();
    g.Start();
}

public void Start() {
    running = true;
    new Thread(this).start();
}

private static final int MapHeight = 40;

public void Stop() {
    running = false;

}

Im using windows 7 and JAVA 7. Hope I can get some help.

Have you set the main class in the manifest file? – Dave Newton Feb 02 '13 at 15:16 — Dave Newton, Feb 02 '13 at 15:16

score 0 · Answer 1 · answered Feb 02 '13 at 15:19

0

If you want an executable jar, you need to have a MANIFEST.MF file that defines the main class to run...

Main-Class: net.test.Class

If you want to run from the command line, you have to tell it what class to run, and probably the class path. This could go into a .bat

answered Feb 02 '13 at 15:19

DomV

124
4

Manifest-Version: 1.0 Class-Path: . Main-Class: Game Thats what in my manifest – Lucass Spencer Feb 02 '13 at 15:20
@LucassSpencer Is it possible that your `Game` class is inside some package? If so then `Main-Class:` should contain `your.package.name.Game`. – Pshemo Feb 02 '13 at 16:03
I have just updated it and yes it is in a package, it wasnt when I put up the message here is what it says now. – Lucass Spencer Feb 02 '13 at 16:10

score 0 · Answer 2 · answered Feb 02 '13 at 15:25

0

In Eclipse click on the project -> right click -> Export. Select Runnable Jar file.

Select a Launch Configuration which worked in Eclipse.

Eclispe will generate that MANIFEST.MF file for you into your jar file.

then oyu can run on your cmd: java -jar niceJarfile.jar and everything will work fine.

If not open the jar file and look if the right main-class is mentioned there.

answered Feb 02 '13 at 15:25

Zarathustra

2,853
4
33
62

Manifest-Version: 1.0 Class-Path: . Main-Class: Game Thats what in my manifest yes it is – Lucass Spencer Feb 02 '13 at 15:27
You don't have packages? Its always "save" to put your Classes into a package. http://en.wikipedia.org/wiki/Java_package Just try it out. – Zarathustra Feb 02 '13 at 15:30
I do now , to no avail... – Lucass Spencer Feb 02 '13 at 15:42
I did try what you siad multiple times. – Lucass Spencer Feb 02 '13 at 15:49

Cannot find or load main class ERROR

2 Answers2