LibGDX运行错误“ ClassNotFoundException”

Question

I've created a Java LibGDX project in Eclipse and haven't edited anything other than the window's title and the dimensions of the window. When running the project it returns the following error: Exception in thread "main" java.lang.NoClassDefFoundError: com/badlogic/gdx/jnigen/NativeCodeGenerator at com.badlogic.gdx.physics.bullet.BulletBuild.main(BulletBuild.java:32) Caused by: java.lang.ClassNotFoundException: com.badlogic.gdx.jnigen.NativeCodeGenerator at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 1 more

I never used to have this issue and it has only just began occurring in this new project.

Code

import com.badlogic.gdx.backends.lwjgl.LwjglApplication;
import com.badlogic.gdx.backends.lwjgl.LwjglApplicationConfiguration;


import de.matthiasmann.twlthemeeditor.Main;

public class DesktopLauncher {
    public static void main (String[] arg) {
        LwjglApplicationConfiguration config = new LwjglApplicationConfiguration();
        config.title = "AI Path Finding";
        config.width = Main.WIDTH;
        config.height = Main.HEIGHT;
        new LwjglApplication(new Game(), config);
    }
}

Other class:

import com.badlogic.gdx.ApplicationAdapter;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;

public class Game extends ApplicationAdapter {

    private final static int WIDTH = 800;
    private final static int HEIGHT = 800;

    SpriteBatch batch;
    Texture img;

    @Override
    public void create () {
        batch = new SpriteBatch();
        img = new Texture("badlogic.jpg");
    }

    @Override
    public void render () {
        Gdx.gl.glClearColor(1, 0, 0, 1);
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
        batch.begin();
        batch.draw(img, 0, 0);
        batch.end();
    }
}

Answer 1

To develop your application via Eclipse, you need to install the

following pieces of software. You can find an in depth guide HERE :

• Java Development Kit 7+ ( JDK ) (6 will not work!): http://www.oracle.com/technetwork/java/javase/downloads/index.html

• Android SDK : http://developer.android.com/sdk/installing.html

• Android Development Tools for Eclipse :
  https://dl-ssl.google.com/android/eclipse/ (use this link as update site for eclipse)

• Eclipse Integration Gradle :
  http://dist.springsource.com/snapshot/TOOLS/gradle/nightly (for Eclipse 4.4) or http://dist.springsource.com/release/TOOLS/gradle (for Eclipse < 4.4)

See also:

https://github.com/libgdx/libgdx/wiki/Setting-up-your-Development-Environment-(Eclipse,-Intellij-IDEA,-NetBeans)