NetBeans的HintsController和EventQueue

Question

我们正在构建一个基于Netbeans平台的应用程序，其中一部分是我们使用的特定语言的编辑器。

我们有以下类来突出显示语法中的错误：

class SyntaxErrorsHighlightingTask extends org.netbeans.modules.parsing.spi.ParserResultTask {

public SyntaxErrorsHighlightingTask () {
}

@Override
public void run (org.netbeans.modules.parsing.spi.Parser.Result result, org.netbeans.modules.parsing.spi.SchedulerEvent event) {
    try {
        final javax.swing.text.Document document = result.getSnapshot().getSource ().getDocument(false);
        final List<ErrorDescription> errors = new ArrayList<ErrorDescription> ();
        // finds errors on the document and add them to 'errors' list
        }

        /***
        OFFENDING CODE GOES HERE
        ***/

    } catch (javax.swing.text.BadLocationException ex1) {
        org.openide.util.Exceptions.printStackTrace (ex1);
    } catch (org.netbeans.modules.parsing.spi.ParseException ex1) {
        Exceptions.printStackTrace (ex1);
    }
}

@Override
public int getPriority () {
    return 100;
}

@Override
public Class<? extends Scheduler> getSchedulerClass () {
    return Scheduler.EDITOR_SENSITIVE_TASK_SCHEDULER;
}

@Override
public void cancel () {
}

}

抛出异常的违规代码如下：

org.netbeans.spi.editor.hints.HintsController.setErrors (document, "testsequence", errors);

根据搜索结果，将其更改为：

SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                     System.err.println("is EDT? " + SwingUtilities.isEventDispatchThread());
                     HintsController.setErrors (document, "testsequence", errors);
                }
           });

以下是在编辑器中引入语法错误时会发生的情况：

is EDT? true
SEVERE [org.openide.util.RequestProcessor]: Error in RequestProcessor org.netbeans.spi.editor.hints.HintsController$1
java.lang.IllegalStateException: Must be run in EQ
    at org.netbeans.editor.Annotations.addAnnotation(Annotations.java:195)
    at org.netbeans.modules.editor.NbEditorDocument.addAnnotation(NbEditorDocument.java:251)
    at org.openide.text.NbDocument.addAnnotation(NbDocument.java:504)
    at org.netbeans.modules.editor.hints.AnnotationHolder$NbDocumentAttacher.attachAnnotation(AnnotationHolder.java:235)
    at org.netbeans.modules.editor.hints.AnnotationHolder.attachAnnotation(AnnotationHolder.java:208)
    at org.netbeans.modules.editor.hints.AnnotationHolder.updateAnnotationOnLine(AnnotationHolder.java:674)
    at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptionsImpl(AnnotationHolder.java:899)
    at org.netbeans.modules.editor.hints.AnnotationHolder.access$1300(AnnotationHolder.java:113)
    at org.netbeans.modules.editor.hints.AnnotationHolder$4.run(AnnotationHolder.java:812)
    at org.netbeans.editor.BaseDocument.render(BaseDocument.java:1409)
    at org.netbeans.modules.editor.hints.AnnotationHolder.setErrorDescriptions(AnnotationHolder.java:809)
    at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrorsImpl(HintsControllerImpl.java:111)
    at org.netbeans.modules.editor.hints.HintsControllerImpl.setErrors(HintsControllerImpl.java:93)
    at org.netbeans.spi.editor.hints.HintsController$1.run(HintsController.java:79)
    at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1424)
    at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1968)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to
    at org.openide.util.RequestProcessor.post(RequestProcessor.java:425)
    at org.netbeans.spi.editor.hints.HintsController.setErrors(HintsController.java:77)
    at com.#.#.#.editor.parser.SyntaxErrorsHighlightingTask$1.run(SyntaxErrorsHighlightingTask.java:74)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641)
    at java.awt.EventQueue.access$000(EventQueue.java:84)
    at java.awt.EventQueue$1.run(EventQueue.java:602)
    at java.awt.EventQueue$1.run(EventQueue.java:600)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:611)
    at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
[catch] at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

发生的情况是，对HintsController的调用是在EDT (EventDispatch线程)中进行的。然而，Annotations.addAnnotation()正在另一个线程中运行--有时是在“系统剪贴板同步器”线程中，有时是在“非活动RequestProcessor”线程中。因为它检查它是否在EDT上运行，所以它总是抛出一个IllegalStateException。

我不是使用Netbeans平台的专家，而且我对公司的这个特定应用程序非常陌生-所以我可能遗漏了一些非常明显的东西。谷歌帮不了多少忙。有人有什么建议吗？

Answer 1

事实证明，这毕竟不是代码的问题。

正如NetBeans-dev列表中所指出的：

HintsController.setErrors可以从任何线程调用-它使用自己的工作线程，并在必要时重新调度到AWT线程。

在AWT线程中调用Annotations.addAnnotation的要求在很长一段时间以前已经被：http://hg.netbeans.org/main-silver/rev/db82e4e0fbcc删除了

相同的变更集还删除了NbDocument.addAnnotation中自动重新调度到awt线程的功能。因此，您正在使用的构建似乎具有变更集的第二部分，但没有第一部分(...)

仔细查看maven的pom.xml文件后，我意识到应用程序加载的是较新版本的库，而模块加载的是较旧的版本，因此它会运行错误的代码。关于那个here的相关问题。

Answer 2

也许你应该尝试用下面这样的方法来更新你的错误：

private void updateError(javax.swing.text.Document document, List<ErrorDescription> errors) {
    if(javax.swing.SwingUtilities.isEventDispatchThread()) {
        HintsController.setErrors (document, "testsequence", errors);
    }
    else {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                 HintsController.setErrors (document, "testsequence", errors);
            }
       });
    }    
}