获取java.lang.IllegalStateException:此调用必须在AWT事件调度线程中发生！请参阅 [英] Getting java.lang.IllegalStateException: This call must happen in the AWT Event Dispatch Thread! Please refer to
问题描述
我正在尝试使用Swing来实现Web浏览器.这是下面的代码.
I am trying to implement web browser using Swing. Here is code below.
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.Insets;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import chrriis.dj.nativeswing.swtimpl.NativeInterface;
import chrriis.dj.nativeswing.swtimpl.components.JWebBrowser;
public class WebPageDisplay extends JPanel{
public WebPageDisplay() {
super(new BorderLayout());
try{
NativeInterface.open();
JPanel webBrowserPanel = new JPanel(new BorderLayout());
final JWebBrowser webBrowser = new JWebBrowser();
webBrowser.setBarsVisible(false);
webBrowser.setStatusBarVisible(true);
webBrowserPanel.add(webBrowser, BorderLayout.CENTER);
add(webBrowserPanel, BorderLayout.CENTER);
webBrowser.navigate("www.google.com);
JScrollPane scrollPane = new JScrollPane();
Dimension preferredSize = scrollPane.getPreferredSize();
preferredSize.height += 20;
scrollPane.setPreferredSize(preferredSize);
add(scrollPane,new GridBagConstraints(0, 2, 2, 1, 1.0, 1.0, GridBagConstraints.CENTER,
GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));
}catch(Exception e){
e.printStackTrace();
}
}
public static void main(String[] args){
WebPageDisplay display = new WebPageDisplay();
}
}
我正处于异常之下.
On Mac, "NativeInterface.initialize()"/"NativeInterface.open()" should not be called after AWT static initializers have run, otherwise there can be all sorts of side effects (non-functional modal dialogs, etc.). Generally, the problem is when the "main(String[])" method is located inside an AWT component subclass and the fix is to move that main method to a standalone class. The problematic class here is "WebPageDisplay"
***WARNING: Display must be created on main thread due to Cocoa restrictions.
2012-09-17 22:48:04.943 java[248:407] _createMenuRef called with existing principal MenuRef already associated with menu
2012-09-17 22:48:05.134 java[248:407] (
0 CoreFoundation 0x00007fff96568286 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff9244dd5e objc_exception_throw + 43
2 CoreFoundation 0x00007fff965680ba +[NSException raise:format:arguments:] + 106
3 CoreFoundation 0x00007fff96568044 +[NSException raise:format:] + 116
4 AppKit 0x00007fff8fea7597 -[NSCarbonMenuImpl _createMenuRef] + 64
5 AppKit 0x00007fff8fea6e82 -[NSCarbonMenuImpl _instantiateCarbonMenu] + 148
6 AppKit 0x00007fff8fe7bb43 -[NSApplication finishLaunching] + 878
7 libawt.jnilib 0x0000000106a6a157 -[NSApplicationAWT finishLaunching] + 641
8 libswt-pi-cocoa-3730.jnilib 0x00000001080f9eb2 Java_org_eclipse_swt_internal_cocoa_OS_objc_1msgSendSuper__Lorg_eclipse_swt_internal_cocoa_objc_1super_2J + 89
9 ??? 0x0000000102abdd6e 0x0 + 4339785070
)
java.lang.IllegalStateException: This call must happen in the AWT Event Dispatch Thread! Please refer to http://java.sun.com/docs/books/tutorial/uiswing/concurrency/index.html and http://java.sun.com/javase/6/docs/api/javax/swing/SwingUtilities.html#invokeLater(java.lang.Runnable)
at chrriis.dj.nativeswing.swtimpl.core.MessagingInterface.checkUIThread(MessagingInterface.java:161)
at chrriis.dj.nativeswing.swtimpl.core.SWTNativeInterface.checkUIThread(SWTNativeInterface.java:475)
at chrriis.dj.nativeswing.swtimpl.core.SWTNativeComponent.runSync(SWTNativeComponent.java:184)
at chrriis.dj.nativeswing.swtimpl.components.core.NativeWebBrowser.navigate(NativeWebBrowser.java:728)
at chrriis.dj.nativeswing.swtimpl.components.JWebBrowser.navigate(JWebBrowser.java:315)
at chrriis.dj.nativeswing.swtimpl.components.JWebBrowser.navigate(JWebBrowser.java:305)
at WebPageDisplay.<init>(WebPageDisplay.java:31)
at WebPageDisplay.main(WebPageDisplay.java:54)
我在我的类路径中使用下面的jars.
I am using below jars in my classpath.
DJNativeSwing-SWT.jar
DJNativeSwing.jar
swt-3.7M7-cocoa-macosx-x86_64.jar
推荐答案
您的错误消息告诉您出了什么问题:
Your error message is telling you what's wrong:
在Mac上，AWT静态初始化程序运行后，不应调用"NativeInterface.initialize()"/"NativeInterface.open()"，否则可能会产生各种副作用(非功能性模式对话框等). ).通常，问题在于"main(String [])"方法位于AWT组件子类内部，而解决方法是将该main方法移至独立类.这里有问题的类是"WebPageDisplay"
On Mac, "NativeInterface.initialize()"/"NativeInterface.open()" should not be called after AWT static initializers have run, otherwise there can be all sorts of side effects (non-functional modal dialogs, etc.). Generally, the problem is when the "main(String[])" method is located inside an AWT component subclass and the fix is to move that main method to a standalone class. The problematic class here is "WebPageDisplay"
您需要在事件调度线程EDT上启动GUI.但话虽如此，在您的GUI在EDT上排队之前，需要在 main 线程而不是EDT上启动NativeInterface.根据 NativeInterface API 的open()方法部分:
You need to start your GUI on the Event Dispatch Thread, the EDT. But having said that, the NativeInterface needs to be started up on the main thread, not the EDT, before your GUI is queued on the EDT. Per the open() method section of the NativeInterface API:
如果尚未初始化接口，则会进行初始化.如果未明确执行初始化，则应在程序的早期调用此方法，最好的位置是在main方法中的第一个调用.
Initialization takes place if the interface was not already initialized. If initialization was not explicitely performed, this method should be called early in the program, the best place being as the first call in the main method.
因此您的代码应如下所示:
So your code could look like this:
public static void main(String[] args){
// start your NativeInterface here!
NativeInterface.open(); // not sure what else may be needed for this
SwingUtilities.invokeLater(new Runnable() {
public void run() {
WebPageDisplay display = new WebPageDisplay();
}
});
}
请注意，我没有，也没有使用过NativeInterface库，因此无法测试此代码.
Note that I do not have nor have I used the NativeInterface library so cannot test this code.
请注意，我看不到将GUI组件添加到顶级窗口(例如JFrame)的位置，所以我不确定如何显示GUI.
Note that I do not see where you add your GUI components to a top-level window such as a JFrame, so I'm not sure how you display the GUI.
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