Java Swing中的IllegalComponentStateException

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在做基础 java swing程序的时候,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,JOptionPane.PLAIN_MESSAGE,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,一个错误发生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,这是你问我的结果:
的System.out.println(System.getProperty( “java.vm.name”));给我:

Java HotSpot(TM) 64-Bit Server VM.

.System.getProperties()名单(的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:我忘了提到我尝试在另一个mac上完全像我的(除了我有更多的内存,但没关系)和在Windows 7计算机上.

解决方法

我在Mac Yosemite上遇到了与Java 7相同的问题.在我的情况下,它是由我用于在桌面上安排我的窗口的第三方工具“Cinch”引起的.取消激活该工具会使例外消失.
原文链接:https://www.f2er.com/java/122160.html

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