IEclipseContextでクラスが注入されない

Question

Eclipse-RCPの新機能として、私は本から練習をしていました。以下は、運動をしながら、私が直面しています問題がある

私はカスタムイベントと上記使用していますハンドラを作成しようとしています

public class SnippetRepository { 

    public ArrayList<SnippetData> snippets = new ArrayList<>(); 
    public String repositoryPath; 

    public SnippetRepository() { 
     super(); 
     // TODO Auto-generated constructor stub 
    } 
} 

私のEclipse E4プロジェクトに「SnippetRepository」と呼ばれるクラスを持っていますクラス

public class SnippetListView { 
     ...... 
    ............ 
     @Inject 
    public void onAddNewSnippet(@Optional @UIEventTopic(CodeSnippetAppConstants.NEW_SNIPPET_EVENT) Object data, 
      SnippetRepository repository) { 
     SnippetData newSnippet = new SnippetData("Untitled" + (newSnippetCounter++)); 
     repository.snippets.add(newSnippet); 
     snippetview.refresh(); 
     snippetview.setSelection(new StructuredSelection(newSnippet)); 

    } 

} 

上記の方法は、「SnippetRepository」クラスとしてNULLポインタ例外を生成し、コンテキスト

Iに注入取得されていませんアクティベータークラスの「SnippetRepository」クラスのオブジェクトが含まれている

@Override 
    public void start(BundleContext context) throws Exception { 
     // TODO Auto-generated method stub 
     IEclipseContext ctx = E4Workbench.getServiceContext(); 
     SnippetRepository repository = new SnippetRepository(); 
     ctx.set(SnippetRepository.class, repository); 

    } 

は、しかし、これはE4Workbenchが内部クラスであると、私はこれを再現することはできません

org.eclipse.e4.core.di.InjectionException: Unable to process "SnippetListView#onAddNewSnippet()": no actual value was found for the argument "SnippetRepository". 
    at org.eclipse.e4.core.internal.di.InjectorImpl.reportUnresolvedArgument(InjectorImpl.java:424) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.resolveRequestorArgs(InjectorImpl.java:415) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:110) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:345) 
    at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:264) 
    at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:162) 
    at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:104) 
    at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:73) 
    at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:55) 
    at org.eclipse.e4.ui.workbench.renderers.swt.ContributedPartRenderer.createWidget(ContributedPartRenderer.java:129) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createWidget(PartRenderingEngine.java:971) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:640) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:746) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$0(PartRenderingEngine.java:717) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$2.run(PartRenderingEngine.java:711) 
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:695) 
    at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:71) 
    at org.eclipse.e4.ui.workbench.renderers.swt.SashRenderer.processContents(SashRenderer.java:151) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:654) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:746) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$0(PartRenderingEngine.java:717) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$2.run(PartRenderingEngine.java:711) 
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:695) 
    at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:71) 
    at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveRenderer.processContents(PerspectiveRenderer.java:49) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:654) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:746) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$0(PartRenderingEngine.java:717) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$2.run(PartRenderingEngine.java:711) 
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:695) 
    at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveStackRenderer.showTab(PerspectiveStackRenderer.java:82) 
    at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer$1.handleEvent(LazyStackRenderer.java:72) 
    at org.eclipse.e4.ui.services.internal.events.UIEventHandler$1.run(UIEventHandler.java:40) 
    at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:186) 
    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.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:36) 
    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.e4.ui.model.application.ui.advanced.impl.PerspectiveStackImpl.setSelectedElement(PerspectiveStackImpl.java:135) 
    at org.eclipse.e4.ui.model.application.ui.advanced.impl.PerspectiveStackImpl.setSelectedElement(PerspectiveStackImpl.java:1) 
    at org.eclipse.e4.ui.workbench.renderers.swt.LazyStackRenderer.postProcess(LazyStackRenderer.java:108) 
    at org.eclipse.e4.ui.workbench.renderers.swt.PerspectiveStackRenderer.postProcess(PerspectiveStackRenderer.java:63) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:658) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:746) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$0(PartRenderingEngine.java:717) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$2.run(PartRenderingEngine.java:711) 
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:695) 
    at org.eclipse.e4.ui.workbench.renderers.swt.SWTPartRenderer.processContents(SWTPartRenderer.java:71) 
    at org.eclipse.e4.ui.workbench.renderers.swt.WBWRenderer.processContents(WBWRenderer.java:614) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:654) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.safeCreateGui(PartRenderingEngine.java:746) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.access$0(PartRenderingEngine.java:717) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$2.run(PartRenderingEngine.java:711) 
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.createGui(PartRenderingEngine.java:695) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1057) 
    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.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:159) 
    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(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: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) 

Answer 1

を取得していますスタックトレースであるあなたこれを使用すべきではありません。

注入することができるクラスの単一のインスタンスを持っているための最も簡単な方法は、@Creatableと@Singleton注釈でそれを宣言することです：

@Creatable 
@Singleton 
public class SnippetRepository { 
    ... 
} 

Eclipseはその後、自動的にこのへのアクセスを管理します。

アプリケーションコンテキストのクラスを 'AddOn'で設定するか、またはContextFunctionを使用してオンデマンドでクラスを作成できます。

Answer 2

@optional表記は、メソッドの宣言

@Inject @Optional 
public void onAddNewSnippet(
     @UIEventTopic(CodeSnippetAppConstants.NEW_SNIPPET_EVENT) Object Data, 
     SnippetRepository repository){ 
     ... 
} 

外側に配置されるべきです