Question

在做基础的java swing程序时，我有一个奇怪的错误，我只在我的电脑上（我试过另外两个，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);
        }
}

问题是当我点击下拉菜单选择一个选项时出现错误。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

正如你所看到的，发生错误但我仍然可以得到函数的结果，所以我没有得到什么错误...任何线索？我在MacOS X Mountain Lion上使用Java 7。

好的，这就是你问我的结果：
的System.out.println（System.getProperty（ “java.vm.name”））;给了我：

Java HotSpot(TM) 64-Bit Server VM.

System.getProperties（）列表（的System.out）。给了我：

-- 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个mac上尝试过与我的完全相同（除了我有更多的内存但没关系）和Windows 7计算机上。

Answer 1

我在Mac Yosemite上遇到了与Java 7相同的问题。在我的情况下，它是由第三方工具引起的，叫做＆＃34; Cinch＆＃34;我用来在桌面上安排我的窗户。取消激活该工具会使例外消失。

Answer 2

您是否正在使用（另外优秀的）窗口管理增强器zooom？

我使用某些Java GUI始终会出现此错误，即使使用Matlab等商业软件也是如此。

除了混乱的控制台外，它似乎从来没有打扰任何功能。

不幸的是我没有解决方案。但也许知道这可能是有帮助的。

Answer 3

重写为充满鳗鱼的气垫船说：

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

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

}

不再出现例外情况。

编辑：

使用Oracle Java7编译和运行没有问题。看起来OpenJDK for Mac有一些issues。如果我没有看到这个，我会确信你没有发布整个堆栈跟踪。 请再次确认您已发布整个堆栈跟踪。如果您已发布整个堆栈跟踪，那么：

您使用的是OpenJDK还是Oracle Java？
另外两台电脑也是Mac或？

要检查您正在使用的JVM实现，请将此行放在代码中：

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

并发布输出。如果输出为null，则输入以下行：

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

并发布输出。

Answer 4

只是一个想法。将您的panel变量设为全局变量，然后将showInputDialog的第一个参数从this更改为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)

建议问题是parentComponent的{{1}}参数。更改您的代码并创建showInputDialog而不是扩展它。另请参阅this和this

编辑2：

我改变了你的代码，运行它，如果异常仍然存在，那么我不知道还有什么问题可能......

JFrame

Java Swing中的IllegalComponentStateException

正如你所看到的，发生错误但我仍然可以得到函数的结果，所以我没有得到什么错误...任何线索？我在MacOS X Mountain Lion上使用Java 7。

4 个答案: