java - Javaの例外が発生しました

Question

Javaを使用してゲームを作成し始めたばかりです。問題は、このエラーのために実行されないことです:

Exception in thread "main" java.lang.SecurityException: Prohibited package name: java.maze.game
at java.lang.ClassLoader.preDefineClass(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
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)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Java 例外が発生したと表示されますが、他のすべてのプログラムは実行されます。私はもう試した：

• Java のアンインストールと再インストール
• 最新の Eclipse プログラムを実行する (私は Juno を実行しています)

これが私のコードです：

package java.maze.game;

import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Dimension;

import javax.swing.JFrame;

public class Game extends Canvas implements Runnable {

private static final long serialVersionUID = 1L;

public static final int WIDTH = 160;
public static final int HEIGHT = WIDTH/12*9;
public static final int SCALE = 3;
public static final String NAME = "Maze game";

public boolean running = false;

private JFrame frame;

public Game(){
    setMinimumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));   //sets the minimum size of the frame
    setMaximumSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE));   //sets the maximum size of the frame
    setPreferredSize(new Dimension(WIDTH * SCALE, HEIGHT * SCALE)); //sets the preferred size of the frame

    frame = new JFrame(NAME);   //creates the frame
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   //set the default for what happens when the program is exited

    frame.setLayout(new BorderLayout());    //creating a new layout for the frame
    frame.add(this, BorderLayout.CENTER);   //keeps everything centered not overlapping the taskbar

    frame.pack();   //sets the frame above or at the preferred size
    frame.setResizable(false);  //makes sure the user can't resize the frame
    frame.setLocationRelativeTo(null);  //we don't want the location of the screen relative to any variable
    frame.setVisible(true); //sets the frame to visible
}

public void start() {
    running = true;
    new Thread(this).start(); //whenever the Thread is started it will run the run(); method

}
public void stop() {
    running = false;

}

public void run() {
    while(running){
        System.out.println("It worked!");
    }
}

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

ありがとうございました！

EDIT 今はばかのように感じますが、もう一度ありがとう.