6

在做一个基于 java swing 程序的时候，我遇到了一个奇怪的错误，我只在我的电脑上遇到了一个奇怪的错误（我尝试了另外 2 个，一切都很好）。

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class ModalDialogsTest extends JFrame implements ActionListener{

        private JButton choice;

        ModalDialogsTest(){
                setSize(400,300);
                JPanel panel = new JPanel();
                getContentPane().add(panel);
                panel.setLayout(new BoxLayout(panel,BoxLayout.Y_AXIS));
            choice = new JButton("My button");
            panel.add(choice);
            choice.addActionListener(this);
        }

        public void actionPerformed(ActionEvent event){
                        simpleStringChoiceDialog();
        }

        private void simpleStringChoiceDialog(){
                Object[] possibilities = {"choice 1", "choice 2", "choice 3"};
                String s = (String)JOptionPane.showInputDialog(
                                    this, null, null,
                                    JOptionPane.PLAIN_MESSAGE, null,
                                    possibilities, possibilities[0]);
                System.out.println(s);
        }

        public static void main(String[] args) {
                ModalDialogsTest newWindow = new ModalDialogsTest();
                newWindow.setVisible(true);
        }
}

问题是当我单击下拉菜单选择选项时出现错误。错误是：

    java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
    at java.awt.Component.getLocationOnScreen_NoTreeLock(Component.java:2044)
    at java.awt.Component.getLocationOnScreen(Component.java:2018)
    at sun.lwawt.macosx.CAccessibility$22.call(CAccessibility.java:390)
    at sun.lwawt.macosx.CAccessibility$22.call(CAccessibility.java:388)
    at sun.lwawt.macosx.LWCToolkit$CallableWrapper.run(LWCToolkit.java:527)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:241)
    at sun.lwawt.macosx.LWCToolkit$CPeerEvent.dispatch(LWCToolkit.java:684)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:682)
    at java.awt.EventQueue$3.run(EventQueue.java:680)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:155)
    at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182)
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:219)
    at java.awt.Dialog.show(Dialog.java:1077)
    at javax.swing.JOptionPane.showInputDialog(JOptionPane.java:583)
    at ModalDialogsTest.simpleStringChoiceDialog(ModalDialogsTest.java:109)
    at ModalDialogsTest.actionPerformed(ModalDialogsTest.java:70)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6505)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6270)
    at java.awt.Container.processEvent(Container.java:2229)
    at java.awt.Component.dispatchEventImpl(Component.java:4861)
    at java.awt.Container.dispatchEventImpl(Container.java:2287)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
    at java.awt.Container.dispatchEventImpl(Container.java:2273)
    at java.awt.Window.dispatchEventImpl(Window.java:2719)
    at java.awt.Component.dispatchEvent(Component.java:4687)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:682)
    at java.awt.EventQueue$3.run(EventQueue.java:680)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
    at java.awt.EventQueue$4.run(EventQueue.java:696)
    at java.awt.EventQueue$4.run(EventQueue.java:694)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)
    choice 2

如您所见，发生了错误，但我仍然可以获得函数的结果，所以我不知道出了什么问题......有什么线索吗？我在 MacOS X Mountain Lion 上使用 Java 7。

好的，这是您问我的结果：
System.out.println(System.getProperty("java.vm.name")); 给我：

Java HotSpot(TM) 64-Bit Server VM.

System.getProperties().list(System.out); 给我：

-- listing properties --
java.runtime.name=Java(TM) SE Runtime Environment
sun.boot.library.path=/Library/Java/JavaVirtualMachines/jdk...
java.vm.version=23.3-b01
user.country.format=IE
gopherProxySet=false
java.vm.vendor=Oracle Corporation
java.vendor.url=http://java.oracle.com/
path.separator=:
java.vm.name=Java HotSpot(TM) 64-Bit Server VM
file.encoding.pkg=sun.io
user.country=FR
sun.java.launcher=SUN_STANDARD
sun.os.patch.level=unknown
java.vm.specification.name=Java Virtual Machine Specification
user.dir=/Users/hugo/Documents/workspace/dialogs
java.runtime.version=1.7.0_07-b10
java.awt.graphicsenv=sun.awt.CGraphicsEnvironment
java.endorsed.dirs=/Library/Java/JavaVirtualMachines/jdk...
os.arch=x86_64
java.io.tmpdir=/var/folders/2n/q2bb2df90qqb_x38djlwx...
line.separator=

java.vm.specification.vendor=Oracle Corporation
os.name=Mac OS X
sun.jnu.encoding=US-ASCII
java.library.path=/Users/hugo/Library/Java/Extensions:/...
java.specification.name=Java Platform API Specification
java.class.version=51.0
sun.management.compiler=HotSpot 64-Bit Tiered Compilers
os.version=10.8
http.nonProxyHosts=local|*.local|169.254/16|*.169.254/16
user.home=/Users/hugo
user.timezone=
java.awt.printerjob=sun.lwawt.macosx.CPrinterJob
file.encoding=US-ASCII
java.specification.version=1.7
user.name=hugo
java.class.path=/Users/hugo/Documents/workspace/dialo...
java.vm.specification.version=1.7
sun.arch.data.model=64
java.home=/Library/Java/JavaVirtualMachines/jdk...
sun.java.command=ModalDialogsTest
java.specification.vendor=Oracle Corporation
user.language=fr
user.language.format=en
awt.toolkit=sun.lwawt.macosx.LWCToolkit
java.vm.info=mixed mode
java.version=1.7.0_07
java.ext.dirs=/Users/hugo/Library/Java/Extensions:/...
sun.boot.class.path=/Library/Java/JavaVirtualMachines/jdk...
java.vendor=Oracle Corporation
file.separator=/
java.vendor.url.bug=http://bugreport.sun.com/bugreport/
sun.cpu.endian=little
sun.io.unicode.encoding=UnicodeBig
sun.font.fontmanager=sun.font.CFontManager
socksNonProxyHosts=local|*.local|169.254/16|*.169.254/16
ftp.nonProxyHosts=local|*.local|169.254/16|*.169.254/16
sun.cpu.isalist=

编辑：我忘了提到我在另一台和我的完全一样的mac上试过（除了我的内存更多，但没关系）和windows 7电脑上。

4

4 回答 4

6

我在 Mac Yosemite 上使用 Java 7 时遇到了同样的问题。在我的情况下，它是由一个名为“Cinch”的第三方工具引起的，我用它来在桌面上安排我的窗口。停用该工具会使异常消失。

于 2015-09-16T17:41:01.737 回答
4

您是否正在使用（否则非常出色）窗口管理增强器zoom？

我在使用某些 Java GUI 时总是会出现这个错误，即使使用像 Matlab 这样的商业软件也是如此。

除了混乱的控制台之外，它似乎从来没有真正打扰过任何功能。

不幸的是，我没有解决方案。但也许知道这可能是原因是有帮助的。

于 2014-02-01T19:02:40.627 回答
2

Rewrite as Hovercraft Full Of Eels 说：

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            ModalDialogsTest newWindow = new ModalDialogsTest();
            newWindow.setVisible(true);
        }
    });

}

该异常不应再出现。

编辑：

用Oracle Java7编译和运行没有问题。看起来 OpenJDK for Mac 有一些问题。如果我没有看到这一点，我会确信您没有发布整个堆栈跟踪。请再次验证您是否已发布整个堆栈跟踪。如果您已经发布了整个堆栈跟踪，那么：

  1. 您使用的是 OpenJDK 还是Oracle Java？

  2. 另外两台电脑也是 Mac 还是？

要检查您正在使用的 JVM 实现，请将此行放入您的代码中：

System.out.println(System.getProperty("java.vm.name"));

并发布输出。如果输出为空，请输入以下行：

System.getProperties().list(System.out);

并发布输出。

于 2012-10-09T22:51:45.093 回答
0

只是一个想法。使您的panel变量成为全局变量，然后将showInputDialogfrom的第一个参数更改this为panel。

            String s = (String)JOptionPane.showInputDialog(
                                panel, null, null,
                                JOptionPane.PLAIN_MESSAGE, null,
                                possibilities, possibilities[0]);

编辑：

我认为这些行

at javax.swing.JOptionPane.showInputDialog(JOptionPane.java:583)
at ModalDialogsTest.simpleStringChoiceDialog(ModalDialogsTest.java:109)

表明问题是 的parentComponent论点showInputDialog。更改您的代码并创建一个JFrame而不是扩展它。另请参阅此和此

编辑2：

我稍微更改了您的代码，运行它，如果异常仍然存在，那么我不知道还有什么问题......

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class ModalDialogsTest implements ActionListener{

    private JButton choice;
    private JPanel panel = new JPanel();
    private JFrame frame = new JFrame();

    ModalDialogsTest() {
        frame.getContentPane().add(panel);
        panel.setLayout(new BoxLayout(panel,BoxLayout.Y_AXIS));
        choice = new JButton("My button");
        panel.add(choice);
        choice.addActionListener(this);        
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400,300);
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent event) {
        simpleStringChoiceDialog();
    }

    private void simpleStringChoiceDialog() {
        Object[] possibilities = {"choice 1", "choice 2", "choice 3"};
        String s = (String)JOptionPane.showInputDialog(
                    frame.getContentPane(), null, null,
                    // panel, null, null,                   // <-- or this
                    JOptionPane.PLAIN_MESSAGE, null,
                    possibilities, possibilities[0]);
                    System.out.println(s);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ModalDialogsTest();
            }
        });
    }
}
于 2012-10-09T23:34:58.473 回答