我已经使用Eclipse几年了，一切都很好。但是几天前，必定会发生一些事情，因为代码完成了。
问题似乎只与特定项目的1个工作区有关，而与此项目的类无关。
这些建议很好，但确认它们没有插入代码中。
我已经尝试了整个首选项＆gt; ...＆gt;高级到默认，关闭和打开项目，重新启动Eclipse并切换到另一个工作区并返回，但问题仍然存在。
EDIT0：为了澄清，autocomplet在另一个工作区，另一个项目或使用java自己的功能（例如System.out.println（））时工作正常
EDIT1：错误日志打开后，我注意到每次完成失败时都会出现一个新错误，这里是完整的跟踪
java.lang.NullPointerException
at org.eclipse.jdt.internal.compiler.ast.ArrayInitializer.traverse(ArrayInitializer.java:247)
at org.eclipse.jdt.internal.compiler.SourceElementNotifier.visitIfNeeded(SourceElementNotifier.java:783)
at org.eclipse.jdt.internal.compiler.SourceElementNotifier.notifySourceElementRequestor(SourceElementNotifier.java:530)
at org.eclipse.jdt.internal.codeassist.CompletionElementNotifier.notifySourceElementRequestor(CompletionElementNotifier.java:199)
at org.eclipse.jdt.internal.compiler.SourceElementNotifier.notifySourceElementRequestor(SourceElementNotifier.java:696)
at org.eclipse.jdt.internal.codeassist.CompletionElementNotifier.notifySourceElementRequestor(CompletionElementNotifier.java:214)
at org.eclipse.jdt.internal.compiler.SourceElementNotifier.notifySourceElementRequestor(SourceElementNotifier.java:460)
at org.eclipse.jdt.internal.codeassist.CompletionElementNotifier.notifySourceElementRequestor(CompletionElementNotifier.java:193)
at org.eclipse.jdt.internal.codeassist.InternalExtendedCompletionContext.computeEnclosingJavaElements(InternalExtendedCompletionContext.java:158)
at org.eclipse.jdt.internal.codeassist.InternalExtendedCompletionContext.getEnclosingElement(InternalExtendedCompletionContext.java:251)
at org.eclipse.jdt.internal.codeassist.InternalCompletionContext.getEnclosingElement(InternalCompletionContext.java:152)
at org.eclipse.jdt.internal.ui.text.java.ParameterGuessingProposal.getEnclosingElement(ParameterGuessingProposal.java:100)
at org.eclipse.jdt.internal.ui.text.java.ParameterGuessingProposal.guessParameters(ParameterGuessingProposal.java:325)
at org.eclipse.jdt.internal.ui.text.java.ParameterGuessingProposal.computeGuessingCompletion(ParameterGuessingProposal.java:258)
at org.eclipse.jdt.internal.ui.text.java.ParameterGuessingProposal.computeReplacementString(ParameterGuessingProposal.java:224)
at org.eclipse.jdt.internal.ui.text.java.LazyJavaCompletionProposal.getReplacementString(LazyJavaCompletionProposal.java:332)
at org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal.apply(AbstractJavaCompletionProposal.java:388)
at org.eclipse.jdt.internal.ui.text.java.JavaMethodCompletionProposal.apply(JavaMethodCompletionProposal.java:58)
at org.eclipse.jdt.internal.ui.text.java.ParameterGuessingProposal.apply(ParameterGuessingProposal.java:120)
at org.eclipse.jdt.internal.ui.text.java.AbstractJavaCompletionProposal.apply(AbstractJavaCompletionProposal.java:519)
at org.eclipse.jdt.internal.ui.text.java.LazyJavaCompletionProposal.apply(LazyJavaCompletionProposal.java:443)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.insertProposal(CompletionProposalPopup.java:989)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.insertSelectedProposalWithMask(CompletionProposalPopup.java:938)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.verifyKey(CompletionProposalPopup.java:1388)
at org.eclipse.jface.text.contentassist.ContentAssistant$InternalListener.verifyKey(ContentAssistant.java:803)
at org.eclipse.jface.text.TextViewer$VerifyKeyListenersManager.verifyKey(TextViewer.java:485)
at org.eclipse.swt.custom.StyledTextListener.handleEvent(StyledTextListener.java:66)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1103)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1088)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:802)
at org.eclipse.swt.custom.StyledText.handleKeyDown(StyledText.java:6044)
at org.eclipse.swt.custom.StyledText$7.handleEvent(StyledText.java:5733)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1103)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1088)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1130)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1126)
at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1547)
at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4918)
at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:364)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4799)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:359)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5110)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2552)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3822)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
at org.eclipse.equinox.launcher.Main.run(Main.java:1519)
EDIT2：我已经下载了一个全新的Eclipse，问题仍然存在，它似乎也适用于链接库中的类，将代码复制到另一个项目也没有帮助。
EDIT3：它突然重新开始工作了，我不知道为什么，除了在我的项目中手写更多代码之外，我还没有意识到改变任何事情。