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谷歌搜索了很多，我没有发现这个特定类的问题Key.Adapter.class（rt.jar插件 Java Source Attacher（不起作用）。我也重新安装了Eclipse，但仍然出现错误：

错误截图

奇怪的是，我没有对与库相关的任何内容进行任何更改（如果我这样做了，那不是故意的）。我只是在移动一些东西，但与图书馆无关。控制台在第 190 行返回 NullPointerException：

name2.addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent arg0) {

                int key = arg0.getKeyCode();

                if (key == KeyEvent.VK_ESCAPE) {

                    //Custom button text
                    Object[] options = {"Sim",
                                        "Não"};

                        int choice = JOptionPane.showOptionDialog(frame1,
                        "Deseja sair do jogo?",
                        "Mensagem",
                        JOptionPane.YES_NO_CANCEL_OPTION,
                        JOptionPane.QUESTION_MESSAGE,
                        null,
                        options,
                        options[1]);

                        if (choice == 0) {

                            System.exit(0);
                }
            }
        }
        }

        );

做一个新项目也是如此。并且窗口设计器/运行也不能正常工作。

还有另一种可能rt.jar再次有用吗？

java.lang.NullPointerException
    at view.Main.<init>(Main.java:191)
    at view.Main$1.run(Main.java:49)
    at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$500(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
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