我正在从事一个将打开 View 的项目。它应通过上下文菜单条目打开。但这不起作用。 每次我在新的 Eclipse 工作区中打开上下文菜单时，都会收到异常，并且它不会打开处理程序 someorg.handlers.ShowViewHandler
!MESSAGE Exception while dispatching event org.osgi.service.event.Event
我用“我期望它做什么”来评论plugin.xml
谁能告诉我问题是什么/为什么处理程序类没有启动？
<plugin>
<extension point="org.eclipse.ui.commands">
<command
id="someorg.editor.ShowView"
name="ShowView">
<commandParameter
id="FeatureType"
name="feature type"
optional="false"
/>
</command>
</extension>
<extension point="org.eclipse.ui.menus"><!--adds a contextmenu entry with the name "ShowtheView..."-->
<menuContribution locationURI="popup:#TextEditorContext?after=group.find" >
<command
commandId="someorg.editor.ShowView"
label="ShowTheView...">
<visibleWhen checkEnabled="false">
<reference definitionId="someorg.Editor.opened">
</reference>
</visibleWhen>
<parameter name="Type" value="ViewThis"/>
</command>
</menuContribution>
</extension>
<extension point="org.eclipse.ui.handlers"><!--opens the handlerclass "someorg.handlers.ShowViewHandler" where the View is computed.-->
<handler
class="someorg.handlers.ShowViewHandler"
commandId="someorg.editor.ShowView">
<activeWhen>
<reference
definitionId="someorg.Editor.opened">
</reference>
</activeWhen>
</handler>
</extension>
<!--some other (independent) declarations-->
打开上下文菜单后的完整错误日志:
!ENTRY org.eclipse.equinox.event 4 0 2016-02-25 12:00:25.511
!MESSAGE Exception while dispatching event org.osgi.service.event.Event [topic=org/eclipse/e4/ui/model/ui/ElementContainer/children/ADD] {ChangedElement=org.eclipse.e4.ui.model.application.ui.menu.impl.PopupMenuImpl@cd19d0a (elementId: #TextEditorContext, tags: [menuContribution:popup, popup:#TextEditorContext, popup:someorg.EditorContext, popup:#AbstractTextEditorContext], contributorURI: null) (widget: Menu {&Undo Ctrl+Z, Re&vert File, &Save Ctrl+S, |, Quick Outline Ctrl+O, Open Source File, Quick Outline Ctrl+O, Open Declaration F3, Open Call Hierarchy Ctrl+Alt+H, Quick Hierarchy Ctrl+T, Open Type in Hierarchy F4, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Open Call Hierarchy Ctrl+Alt+H, Quick Hierarchy Ctrl+T, Open Type in Hierarchy F4, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Open with SceneBuilder, Open W&ith, Sho&w In Alt+Shift+W, |, Cu&t Ctrl+X, &Copy Ctrl+C, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, &Paste Ctrl+V, |, Rename Element Alt+Shift+R, Validate, Validate, Validate, Extract Local Variable Alt+Shift+L, Organize Imports Ctrl+Shift+O, Rename Element Alt+Shift+R, Validate, Rename Element Alt+Shift+R, Validate, Extract Local Variable Alt+Shift+L, Organize Imports Ctrl+Shift+O, Rename Element Alt+Shift+R, Validate, Validate, Rename Element Alt+Shift+R, Validate, Validate, Rename Element Alt+Shift+R, Validate, Validate, Rename Element Alt+Shift+R, Validate, Rename Element Alt+Shift+R, Validate, Validate, Validate, Validate, Validate, Validate, Validate, Validate, Validate, &Quick Fix Ctrl+1, |, ShowTheView, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, |, Wa&tch, Build & Export FX Application, Upgrade to EclipseLink Mapping File, Upgrade JPA Document Version, Synchronize Class List, Retrieve Context, Explore, I&mport from Repository..., Register As Service... Ctrl+Shift+F10, |, Pre&ferences...}, renderer: null, toBeRendered: true, onTop: false, visible: true, containerData: null, accessibilityPhrase: null) (label: null, iconURI: null, tooltip: null, mnemonics: null) (enabled: true) (context: popup:#TextEditorContext, variables: null), Widget=Menu {&Undo Ctrl+Z, Re&vert File, &Save Ctrl+S, |, Quick Outline Ctrl+O, Open Source File, Quick Outline Ctrl+O, Open Declaration F3, Open Call Hierarchy Ctrl+Alt+H, Quick Hierarchy Ctrl+T, Open Type in Hierarchy F4, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Open Call Hierarchy Ctrl+Alt+H, Quick Hierarchy Ctrl+T, Open Type in Hierarchy F4, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Quick Outline Ctrl+O, Open with SceneBuilder, Open W&ith, Sho&w In Alt+Shift+W, |, Cu&t Ctrl+X, &Copy Ctrl+C, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, Copy Qualified Name, &Paste Ctrl+V, |, Rename Element Alt+Shift+R, Validate, Validate, Validate, Extract Local Variable Alt+Shift+L, Organize Imports Ctrl+Shift+O, Rename Element Alt+Shift+R, Validate, Rename Element Alt+Shift+R, Validate, Extract Local Variable Alt+Shift+L, Organize Imports Ctrl+Shift+O, Rename Element Alt+Shift+R, Validate, Validate, Rename Element Alt+Shift+R, Validate, Validate, Rename Element Alt+Shift+R, Validate, Validate, Rename Element Alt+Shift+R, Validate, Rename Element Alt+Shift+R, Validate, Validate, Validate, Validate, Validate, Validate, Validate, Validate, Validate, &Quick Fix Ctrl+1, |, ShowTheView..., Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, Find References Ctrl+Shift+G, |, Wa&tch, Build & Export FX Application, Upgrade to EclipseLink Mapping File, Upgrade JPA Document Version, Synchronize Class List, Retrieve Context, Explore, I&mport from Repository..., Register As Service... Ctrl+Shift+F10, |, Pre&ferences...}, AttName=children, NewValue=org.eclipse.e4.ui.model.application.ui.menu.impl.HandledMenuItemImpl@6a2e7d2d (elementId: someorg.Editor.ShowView, tags: [], contributorURI: null) (widget: MenuItem {ShowTheView}, renderer: org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer@40e420fe, toBeRendered: true, onTop: false, visible: true, containerData: null, accessibilityPhrase: null) (label: ShowTheView..., iconURI: null, tooltip: null, enabled: true, selected: false, type: Push) (mnemonics: null) (wbCommand: null), EventType=ADD, Position=92} to handler org.eclipse.e4.ui.internal.di.UIEventObjectSupplier$UIEventHandler@60cb098b
!STACK 0
org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:68)
at org.eclipse.e4.ui.internal.di.UIEventObjectSupplier$UIEventHandler$1.run(UIEventObjectSupplier.java:56)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:186)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:145)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4761)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:211)
at org.eclipse.e4.ui.internal.di.UIEventObjectSupplier$UIEventHandler.handleEvent(UIEventObjectSupplier.java:53)
at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:197)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:197)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:148)
at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:135)
at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:78)
at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:39)
at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:85)
at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:59)
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:374)
at org.eclipse.emf.ecore.util.EcoreEList.dispatchNotification(EcoreEList.java:249)
at org.eclipse.emf.common.notify.impl.NotifyingListImpl.addUnique(NotifyingListImpl.java:356)
at org.eclipse.emf.common.util.AbstractEList.add(AbstractEList.java:341)
at org.eclipse.e4.ui.workbench.renderers.swt.ContributionRecord.mergeIntoModel(ContributionRecord.java:250)
at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.processAddition(MenuManagerRenderer.java:554)
at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.generateContributions(MenuManagerRenderer.java:529)
at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.processContributions(MenuManagerRenderer.java:494)
at org.eclipse.ui.internal.PopupMenuExtender.addMenuContributions(PopupMenuExtender.java:409)
at org.eclipse.ui.internal.PopupMenuExtender.menuAboutToShow(PopupMenuExtender.java:381)
at org.eclipse.jface.action.MenuManager.fireAboutToShow(MenuManager.java:333)
at org.eclipse.jface.action.MenuManager.handleAboutToShow(MenuManager.java:466)
at org.eclipse.jface.action.MenuManager.access$1(MenuManager.java:461)
at org.eclipse.jface.action.MenuManager$2.menuShown(MenuManager.java:493)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:255)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1137)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1118)
at org.eclipse.swt.widgets.Control.WM_INITMENUPOPUP(Control.java:5023)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4691)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:339)
at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1633)
at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2117)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5050)
at org.eclipse.swt.internal.win32.OS.TrackPopupMenu(Native Method)
at org.eclipse.swt.widgets.Menu._setVisible(Menu.java:262)
at org.eclipse.swt.widgets.Display.runPopups(Display.java:4221)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3763)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
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:380)
at 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)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)
Caused by: java.lang.NullPointerException
at org.eclipse.ui.internal.commands.SlaveCommandService.registerElementForCommand(SlaveCommandService.java:311)
at org.eclipse.ui.internal.commands.SlaveCommandService.registerElementForUpdate(SlaveCommandService.java:395)
at org.eclipse.e4.ui.workbench.renderers.swt.HandledContributionItem.fill(HandledContributionItem.java:324)
at org.eclipse.jface.action.MenuManager.doItemFill(MenuManager.java:724)
at org.eclipse.jface.action.MenuManager.update(MenuManager.java:806)
at org.eclipse.jface.action.MenuManager.update(MenuManager.java:665)
at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.scheduleManagerUpdate(MenuManagerRenderer.java:1164)
at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.processContents(MenuManagerRenderer.java:636)
at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerRenderer.subscribeTopicChildAdded(MenuManagerRenderer.java:313)
at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
... 68 more
最佳答案
我认为这是因为您为强制命令参数指定了错误的 id。
在org.eclipse.ui.commands中，您将参数声明为
<commandParameter
id="FeatureType"
name="feature type"
optional="false"
所以id是FeatureType
但在 org.eclipse.ui.menus 中您使用:
<parameter name="Type" value="ViewThis"/>
名称确实匹配。
关于java - Eclipse PluginDevelopment - Handlerclass 未由plugin.xml 启动，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35623948/