Question

我有什么：我开发了一个Eclipse编辑器，并使用此方法覆盖SourceViewerConfiguration中的getTextHover方法：

public ITextHover getTextHover(ISourceViewer sourceViewer, String contentType) {
                return new AbstractAnnotationHover(true) {
                    public Object getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
                        IAnnotationModel model = ((SourceViewer) textViewer).getAnnotationModel();
                        @SuppressWarnings("unchecked")
                        Iterator<Annotation> parent = 
                        ((IAnnotationModelExtension2)model).getAnnotationIterator(hoverRegion.getOffset(), 
                                hoverRegion.getLength(), true, true);
                        Iterator<?> iter = new JavaAnnotationIterator(parent, false); 
                        Annotation annotation = null;
                        Position position = null;
                        while (iter.hasNext()) {
                            Annotation a = (Annotation) iter.next();
                            Position p = model.getPosition(a);
                            annotation = a;
                            position = p;
                        }
                        return new AnnotationInfo(annotation, position, textViewer) {
                            public ICompletionProposal[] getCompletionProposals() {
                                ICompletionProposal proposal1 = null;
                                IMarkerResolution [] resolutions = null;
                                ICompletionProposal [] com = null;
                                if (annotation instanceof MarkerAnnotation) {
                                    resolutions = new ErrorResolution().getResolutions(((MarkerAnnotation) annotation).getMarker());
                                    if(resolutions.length != 0){
                                        proposal1 = new MarkerResolutionProposal(resolutions[0], 
                                                ((MarkerAnnotation) annotation).getMarker());
                                        return new ICompletionProposal[] { proposal1 };
                                    }
                                }
                                return com ;
                            }
                        };
                    } 
                };  
  }

当鼠标悬停在代码查看器中的带注释错误上时，它会显示QuickFix。但是，如果我将鼠标悬停在一个没有快速修复或只是正确代码行的错误上，则会导致以下错误：

org.eclipse.swt.SWTException：无法执行runnable（java.lang.NullPointerException）在org.eclipse.swt.SWT.error（SWT.java:4491）在org.eclipse.swt.SWT.error（SWT.java:4406）在org.eclipse.swt.widgets.Synchronizer.runAsyncMessages（Synchronizer.java:138）在org.eclipse.swt.widgets.Display.runAsyncMessages（Display.java:4155）在org.eclipse.swt.widgets.Display.readAndDispatch（Display.java:3772） at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine $ 4.run（PartRenderingEngine.java:1127）在org.eclipse.core.databinding.observable.Realm.runWithDefault（Realm.java:337）在org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run（PartRenderingEngine.java:1018）在org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI（E4Workbench.java:156）在org.eclipse.ui.internal.Workbench $ 5.run（Workbench.java:694）在org.eclipse.core.databinding.observable.Realm.runWithDefault（Realm.java:337）在org.eclipse.ui.internal.Workbench.createAndRunWorkbench（Workbench.java:606）在org.eclipse.ui.PlatformUI.createAndRunWorkbench（PlatformUI.java:150）在org.eclipse.ui.internal.ide.application.IDEApplication.start（IDEApplication.java:139）在org.eclipse.equinox.internal.app.EclipseAppHandle.run（EclipseAppHandle.java:196）在org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication（EclipseAppLauncher.java:134）在org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start（EclipseAppLauncher.java:104）在org.eclipse.core.runtime.adaptor.EclipseStarter.run（EclipseStarter.java:380）在org.eclipse.core.runtime.adaptor.EclipseStarter.run（EclipseStarter.java:235） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:497）在org.eclipse.equinox.launcher.Main.invokeFramework（Main.java:669）在org.eclipse.equinox.launcher.Main.basicRun（Main.java:608）在org.eclipse.equinox.launcher.Main.run（Main.java:1515）在org.eclipse.equinox.launcher.Main.main（Main.java:1488）引起：java.lang.NullPointerException at org.eclipse.jdt.internal.ui.text.java.hover.AbstractAnnotationHover $ AnnotationInformationControl.createAnnotationInformation（AbstractAnnotationHover.java:329） at org.eclipse.jdt.internal.ui.text.java.hover.AbstractAnnotationHover $ AnnotationInformationControl.deferredCreateContent（AbstractAnnotationHover.java:282） at org.eclipse.jdt.internal.ui.text.java.hover.AbstractAnnotationHover $ AnnotationInformationControl.setInput（AbstractAnnotationHover.java:186） at org.eclipse.jface.text.AbstractInformationControlManager.internalShowInformationControl（AbstractInformationControlManager.java:1181） at org.eclipse.jface.text.AbstractInformationControlManager.presentInformation（AbstractInformationControlManager.java:1150） at org.eclipse.jface.text.AbstractHoverInformationControlManager.presentInformation（AbstractHoverInformationControlManager.java:902） at org.eclipse.jface.text.TextViewerHoverManager.doPresentInformation（TextViewerHoverManager.java:243） at org.eclipse.jface.text.TextViewerHoverManager $ 5.run（TextViewerHoverManager.java:233）在org.eclipse.swt.widgets.RunnableLock.run（RunnableLock.java:35）在org.eclipse.swt.widgets.Synchronizer.runAsyncMessages（Synchronizer.java:135） ......还有24个

并且未显示注释的消息。

我想要的是什么：我想，如果我在快速修复可用时出现错误，则会显示快速修复，如果没有，则只显示注释消息。

Eclipse插件：如果Annotation不存在，AbstractAnnotationHover会导致NullPointerException

0 个答案: