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Whenever I try to open code completion on a Java file (by pressing space) I observe the following exception in the log java.lang.NoClassDefFoundError: javax/annotation/PostConstruct at org.eclipse.recommenders.internal.rcp.RcpModule$Listener$1.afterInjection(RcpModule.java:278) at com.google.inject.internal.MembersInjectorImpl.notifyListeners(MembersInjectorImpl.java:97) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:95) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:54) at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38) at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:84) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:54) at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031) at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40) at com.google.inject.Scopes$1$1.get(Scopes.java:65) at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40) at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38) at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:84) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013) at org.eclipse.recommenders.injection.ExtensionFactory.loadExtension(ExtensionFactory.java:50) at org.eclipse.recommenders.injection.ExtensionFactory.create(ExtensionFactory.java:42) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:265) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:63) at org.eclipse.recommenders.completion.rcp.processable.SessionProcessorDescriptor.getProcessor(SessionProcessorDescriptor.java:101) at org.eclipse.recommenders.completion.rcp.processable.IntelligentCompletionProposalComputer.sessionStarted(IntelligentCompletionProposalComputer.java:116) at org.eclipse.jdt.internal.ui.text.java.CompletionProposalComputerDescriptor.sessionStarted(CompletionProposalComputerDescriptor.java:426) at org.eclipse.jdt.internal.ui.text.java.CompletionProposalCategory.sessionStarted(CompletionProposalCategory.java:387) at org.eclipse.jdt.internal.ui.text.java.ContentAssistProcessor$CompletionListener.assistSessionStarted(ContentAssistProcessor.java:122) at org.eclipse.jface.text.contentassist.ContentAssistant.lambda$10(ContentAssistant.java:2506) at java.base/java.util.Collections$SingletonSet.forEach(Collections.java:4795) at org.eclipse.jface.text.contentassist.ContentAssistant.fireSessionBeginEvent(ContentAssistant.java:2503) at org.eclipse.jface.text.contentassist.ContentAssistant.prepareToShowCompletions(ContentAssistant.java:1850) at org.eclipse.jface.text.contentassist.ContentAssistant.access$6(ContentAssistant.java:1841) at org.eclipse.jface.text.contentassist.ContentAssistant$AutoAssistListener.lambda$0(ContentAssistant.java:378) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:185) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4068) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3735) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1173) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1062) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156) at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:628) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:563) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:151) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:155) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:199) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:391) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:246) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:566) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:595) at org.eclipse.equinox.launcher.Main.run(Main.java:1501) This is due to the fact that with Java 9 the class javax/annotation/PostConstruct is no longer exported by default. Please get rid of all code which relies on pre Java9 only classes.
