Eclipse 2021-09无法显示JavaScript文件大纲：问题排查及解决方法咨询

从你描述的现象和抛出的java.util.concurrent.TimeoutException（提示LanguageServer初始化超时）来看，核心问题是Wild Web Developer的JavaScript语言服务未能正常启动，导致大纲视图、快速大纲（Ctrl+O）这些依赖语言服务的功能无法工作。以下是几个针对性的解决方向：

1. 更换Node.js运行环境（优先尝试） #

Wild Web Developer严重依赖Node.js，嵌入式版本可能存在兼容性或路径权限问题。建议手动指定本地安装的Node.js：

• 打开 Window > Preferences > Languages > Node.js
• 取消勾选「Use embedded Node.js」，选择本地已安装的Node.js版本（推荐v14及以上，版本过低可能不兼容插件）
• 应用设置后重启Eclipse，再测试JS文件的大纲和快速导航功能

2. 重置Wild Web Developer的缓存与配置 #

插件的缓存或损坏配置可能导致语言服务初始化失败：

• 完全关闭Eclipse
• 找到你的工作空间目录，删除以下两个文件夹：

  .metadata/.plugins/org.eclipse.lsp4e
  .metadata/.plugins/org.eclipse.wildwebdeveloper
  

• 重新启动Eclipse，插件会自动重建配置文件，之后再测试功能

3. 确保JS文件关联到正确的编辑器 #

你当前使用的Generic Text Editor并没有关联Wild Web Developer的语言服务，这也会导致大纲功能失效：

• 右键目标JS文件 → Open With > Wild Web Developer JavaScript Editor
• 若要设置默认编辑器：打开Window > Preferences > General > Editors > File Associations，找到*.js，将Wild Web Developer JavaScript Editor设为默认选项

4. 更新Wild Web Developer插件版本 #

你使用的Wild Web Developer 0.11.0和Eclipse 4.21.0可能存在兼容性bug，尝试更新到兼容的最新版本：

• 打开Help > Eclipse Marketplace，搜索「Wild Web Developer」，点击「Update」按钮完成更新
• 更新完成后重启Eclipse，验证问题是否解决

附你提供的错误栈信息：

java.util.concurrent.TimeoutException
	at java.base/java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1950)
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2085)
	at org.eclipse.lsp4e.LanguageServerWrapper.getServerCapabilities(LanguageServerWrapper.java:706)
	at org.eclipse.lsp4e.LanguageServiceAccessor.lambda$12(LanguageServiceAccessor.java:557)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:176)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at org.eclipse.lsp4e.LanguageServiceAccessor.getLSPDocumentInfosFor(LanguageServiceAccessor.java:558)
	at org.eclipse.lsp4e.operations.symbols.LSPSymbolInFileHandler.execute(LSPSymbolInFileHandler.java:40)
	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:283)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:97)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:317)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:251)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:173)
	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:156)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:487)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:213)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:308)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:580)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:647)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:439)
	at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:96)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
	at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1270)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1059)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1084)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1069)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1111)
	at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1107)
	at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1536)
	at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4875)
	at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:345)
	at org.eclipse.swt.widgets.Control.windowProc(Control.java:4753)
	at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
	at org.eclipse.swt.widgets.Display.windowProc(Display.java:4958)
	at org.eclipse.swt.internal.win32.OS.DispatchMessage(Native Method)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3624)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1150)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1041)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:644)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:551)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:156)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1467)

会话数据：
eclipse.buildId=4.21.0.I20210906-0500
java.version=15.0.1
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments: -product org.eclipse.epp.package.jee.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.jee.product

内容的提问来源于stack exchange，提问作者Viktor Brešan