为什么我的Runnable Jar文件不起作用

问题描述：

我关注了大约10个不同的教程，其中没有一个似乎可以解决问题，我的runnable jar文件无效。

I followed about 10 different tutorials and none of them seemed to do the trick, my runnable jar file just isn't working.

我的游戏运行很好当我在eclipse中运行它时，我能够将它变成一个可运行的jar文件，仅在一两天前工作并且没有更改过多的代码。当我尝试运行.jar时，屏幕底部会弹出一个java图标但是没有任何反应。

My game runs fine when I run it in eclipse, and I was able to make it into a runnable jar file that worked only a day or two ago and have not changed too much code. When I try to run the .jar a java icon pops up at the bottom of my screen but then nothing happens.

这是我的启动器无法打开（如果我运行的话）没有启动器它工作正常），没有错误我打开终端或日食。

It's my launcher is failing to open (if I run without launcher it works fine), there are no errors wether I open with terminal or eclipse.

package com.l3g3nds.threed;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class Launcher extends JFrame implements MouseListener, MouseMotionListener {
    private static final long serialVersionUID = 1L;

    protected JPanel window = new JPanel();
    // private JButton play, options, help, quit, credits;
    // private Rectangle rplay, roptions, rhelp, rquit, rcredits;

    protected int buttonWidth = 120;
    protected int buttonHeight = 40;

    public Launcher(int id) {
        JPanel panel = (JPanel) getContentPane();

        JLabel label = new JLabel();
        label.setIcon(new ImageIcon("res/Launcher/schoolbackground.png"));
        System.out.println(Display.lScreen());
        if (Display.lScreen() == 5)
            label.setIcon(new ImageIcon("res/Launcher/quit1.png"));
        if (Display.lScreen() == 4)
            label.setIcon(new ImageIcon("res/Launcher/credits1.png"));
        if (Display.lScreen() == 3)
            label.setIcon(new ImageIcon("res/Launcher/options1.png"));
        if (Display.lScreen() == 2)
            label.setIcon(new ImageIcon("res/Launcher/help1.png"));
        if (Display.lScreen() == 1)
            label.setIcon(new ImageIcon("res/Launcher/beginrunning1.png"));
        panel.add(label);

        setUndecorated(true);

        System.out.println("launched");
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setLocationRelativeTo(null);
        pack();
        setVisible(true);

        addMouseListener(this);
        addMouseMotionListener(this);

    }

    public void drawButtons() {
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        int cx = e.getX();
        int cy = e.getY();
        if (cx >= 11 && cy >= 14 && cx <= 214 && cy <= 44) {
            dispose();
            new RunGame();
        } else if (cx >= 11 && cy >= 66 && cx <= 70 && cy <= 96) {
            //open help
        } else if (cx >= 11 && cy >= 119 && cx <= 119 && cy <= 144) {
            this.dispose();
            new Options();
        } else if (cx >= 11 && cy >= 170 && cx <= 114 && cy <= 200) {
            //open credits
        } else if (cx >= 11 && cy >= 222 && cx <= 74 && cy <= 254) {
            System.exit(0);
        }

    }

    @Override
    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseDragged(MouseEvent arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void mouseMoved(MouseEvent e) {
        // TODO Auto-generated method stub
        int mx = e.getX();
        int my = e.getY();
        if (mx >= 11 && my >= 14 && mx <= 214 && my <= 44) {
            if (Display.lScreen() != 1) {
                Display.setlScreen(1);
                new Launcher(1);
                System.out.println("1");
            }
        } else if (mx >= 11 && my >= 66 && mx <= 70 && my <= 96) {
            if (Display.lScreen() != 2) {
                Display.setlScreen(2);
                new Launcher(1);
                System.out.println("2");
            }
        } else if (mx >= 11 && my >= 119 && mx <= 119 && my <= 144) {
            if (Display.lScreen() != 3) {
                Display.setlScreen(3);
                new Launcher(1);
                System.out.println("3");
            }
        } else if (mx >= 11 && my >= 170 && mx <= 114 && my <= 200) {
            if (Display.lScreen() != 4) {
                Display.setlScreen(4);
                new Launcher(1);
                System.out.println("4");
            }
        } else if (mx >= 11 && my >= 222 && mx <= 74 && my <= 254) {
            if (Display.lScreen() != 5) {
                Display.setlScreen(5);
                new Launcher(1);
                System.out.println("5");
            }
        }
        else {
            if (Display.lScreen() != 0) {
                Display.setlScreen(0);
                new Launcher(1);
                System.out.println("0");
            }
        }
    }
}

我正在使用mac，如果这有帮助...

以下是我拍摄的确切步骤的截屏

Here are screen shots that I took of the exact steps I took

我得到的一些警告（我认为它们只是因为未使用的变量，我得到这个消息的时候我才能得到这个消息我的.jar工作）

Some warnings I got (I think they are only because of unused variables, I got this message earlier when I was able to get my .jar to work)

这似乎是我的屏幕顶部和底部的java图标，但没有其他事情发生。

This appears that the top of my screen along with the java icon at the bottom, but nothing else happens.

-Thanks

答

我假设你正在制作一个GUI应用程序，点击它启动Jar？很多时候，如果GUI应用程序在启动时出错，它不会明显地执行任何操作，例如弹出错误消息，因为它还没有机会构建任何类型的GUI来报告错误。我猜你改变的东西会在启动时导致异常，并且该消息不可见，因为你通过点击它来启动jar。

I assume you're making a GUI application, and launching the Jar by clicking on it? Many times if a GUI application has an error at startup, it doesn't visibly do anything, like pop an error message, because it hasn't had a chance to build any sort of GUI to report the error to yet. I would guess that something you changed causes an exception at startup, and that message is not visible because you're launching the jar by clicking on it.

如果你运行从终端罐子（聚光灯：终端）你将能够看到阻止你的Jar运行的堆栈跟踪，并希望这将有助于你进一步调试。

If you run the Jar from the terminal instead (spotlight: "terminal") you will be able to see the stack trace that's preventing your Jar from running, and hopefully that will help you debug further.

$ cd directory/of/jar
$ java -jar name_of_jar.jar
  .... stack trace should appear here, or program should run

您还可以尝试在 main 方法和显示GUI警报，但是如果在 main 方法启动之前引发异常（例如在类加载期间）。换句话说，这是一个很好的，但并不能完全解决问题。您可能仍需要从命令行运行Jar。

You can also try to catch the exception in your main method and display a GUI alert, however this doesn't work if the exception is raised before the main method starts (e.g. during class loading). In other words it's a nice-to-have, but doesn't totally solve the problem. You may still need to run the Jar from the command line.

public static void main(String[] args) {
  try {
    // body of main method goes here, including any other error handling
  } catch (Throwable t) {
    JOptionPane.showMessageDialog(
        null, t.getClass().getSimpleName() + ": " + t.getMessage());
    throw t; // don't suppress Throwable
  }
}

为什么我的Runnable Jar文件不起作用

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