Flaky test on Kokoro Windows: DebugNativeAppEngineStandardProjectTest.testDebugLaunch()

[chanseokoh]

I think this is not the first time I saw this on Kokoro Windows. There is a file not found error, and I wonder if it is related to the Windows-specific environment.

UPDATE: I think the preference loading exception is not related.

!ENTRY org.eclipse.core.resources 4 4 2017-05-02 08:00:54.943
!MESSAGE Exception loading preferences from: /testapp/.settings/org.eclipse.jdt.core.prefs.
!STACK 1
org.eclipse.core.runtime.CoreException: File not found: T:\src\github\google-cloud-eclipse\plugins\com.google.cloud.tools.eclipse.integration.appengine\target\work\data\testapp\.settings\org.eclipse.jdt.core.prefs.
	at org.eclipse.core.internal.filesystem.Policy.error(Policy.java:45)
	at org.eclipse.core.internal.filesystem.local.LocalFile.openInputStream(LocalFile.java:385)
	at org.eclipse.core.internal.localstore.FileSystemResourceManager.read(FileSystemResourceManager.java:849)
	at org.eclipse.core.internal.resources.File.getContents(File.java:277)
	at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:507)
	at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:492)
	at org.eclipse.core.internal.preferences.EclipsePreferences.create(EclipsePreferences.java:370)
	at org.eclipse.core.internal.preferences.EclipsePreferences.internalNode(EclipsePreferences.java:623)
	at org.eclipse.core.internal.preferences.EclipsePreferences.node(EclipsePreferences.java:766)
	at org.eclipse.core.resources.ProjectScope.getNode(ProjectScope.java:69)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.getNode(JavaEditor.java:363)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.contains(JavaEditor.java:383)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.getVisibleStore(ChainedPreferenceStore.java:463)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.handlePropertyChangeEvent(ChainedPreferenceStore.java:347)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.access$0(ChainedPreferenceStore.java:342)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore$PropertyChangeListener.propertyChange(ChainedPreferenceStore.java:67)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.firePropertyChangeEvent(JavaEditor.java:390)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter$PreferenceChangeListener$1.run(JavaEditor.java:332)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:165)
	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:369)
	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.run(RefactoringWizardDialog2.java:321)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.internalPerformFinish(RefactoringWizard.java:636)
	at org.eclipse.ltk.ui.refactoring.UserInputWizardPage.performFinish(UserInputWizardPage.java:145)
	at org.eclipse.ltk.ui.refactoring.resource.DeleteResourcesWizard$DeleteResourcesRefactoringConfigurationPage.performFinish(DeleteResourcesWizard.java:202)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.performFinish(RefactoringWizard.java:710)
	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.okPressed(RefactoringWizardDialog2.java:447)
	at org.eclipse.jface.dialogs.Dialog.buttonPressed(Dialog.java:466)
	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:622)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)
	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.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:165)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:818)
	at org.eclipse.jface.window.Window.open(Window.java:794)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:188)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:203)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:122)
	at org.eclipse.ltk.internal.ui.refactoring.actions.DeleteResourcesHandler.execute(DeleteResourcesHandler.java:41)
	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:291)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
	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:498)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:282)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:264)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:494)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:488)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
	at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommandInContext(LegacyHandlerService.java:402)
	at org.eclipse.ui.internal.ide.actions.LTKLauncher.runCommand(LTKLauncher.java:96)
	at org.eclipse.ui.internal.ide.actions.LTKLauncher.openDeleteWizard(LTKLauncher.java:48)
	at org.eclipse.ui.actions.DeleteResourceAction.run(DeleteResourceAction.java:449)
	at org.eclipse.jdt.internal.ui.refactoring.reorg.DeleteAction.run(DeleteAction.java:194)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:271)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:249)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:473)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
	at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)
	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.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:165)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable.run(UIThreadRunnable.java:78)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable.asyncExec(UIThreadRunnable.java:223)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.asyncExec(AbstractSWTBot.java:598)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:154)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:135)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:125)
	at org.eclipse.swtbot.swt.finder.widgets.SWTBotMenu$1.run(SWTBotMenu.java:86)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1133)
	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:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:684)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
	at org.eclipse.tycho.surefire.osgibooter.UITestApplication.runApplication(UITestApplication.java:31)
	at org.eclipse.tycho.surefire.osgibooter.AbstractUITestApplication.run(AbstractUITestApplication.java:120)
	at org.eclipse.tycho.surefire.osgibooter.UITestApplication.start(UITestApplication.java:37)
	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(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1472)
Caused by: java.io.FileNotFoundException: T:\src\github\google-cloud-eclipse\plugins\com.google.cloud.tools.eclipse.integration.appengine\target\work\data\testapp\.settings\org.eclipse.jdt.core.prefs (The system cannot find the path specified)
	at java.io.FileInputStream.open0(Native Method)
	at java.io.FileInputStream.open(FileInputStream.java:195)
	at java.io.FileInputStream.<init>(FileInputStream.java:138)
	at org.eclipse.core.internal.filesystem.local.LocalFile.openInputStream(LocalFile.java:380)
	... 121 more
!SUBENTRY 1 org.eclipse.core.filesystem 4 269 2017-05-02 08:00:54.943
!MESSAGE File not found: T:\src\github\google-cloud-eclipse\plugins\com.google.cloud.tools.eclipse.integration.appengine\target\work\data\testapp\.settings\org.eclipse.jdt.core.prefs.
!STACK 0
java.io.FileNotFoundException: T:\src\github\google-cloud-eclipse\plugins\com.google.cloud.tools.eclipse.integration.appengine\target\work\data\testapp\.settings\org.eclipse.jdt.core.prefs (The system cannot find the path specified)
	at java.io.FileInputStream.open0(Native Method)
	at java.io.FileInputStream.open(FileInputStream.java:195)
	at java.io.FileInputStream.<init>(FileInputStream.java:138)
	at org.eclipse.core.internal.filesystem.local.LocalFile.openInputStream(LocalFile.java:380)
	at org.eclipse.core.internal.localstore.FileSystemResourceManager.read(FileSystemResourceManager.java:849)
	at org.eclipse.core.internal.resources.File.getContents(File.java:277)
	at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:507)
	at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:492)
	at org.eclipse.core.internal.preferences.EclipsePreferences.create(EclipsePreferences.java:370)
	at org.eclipse.core.internal.preferences.EclipsePreferences.internalNode(EclipsePreferences.java:623)
	at org.eclipse.core.internal.preferences.EclipsePreferences.node(EclipsePreferences.java:766)
	at org.eclipse.core.resources.ProjectScope.getNode(ProjectScope.java:69)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.getNode(JavaEditor.java:363)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.contains(JavaEditor.java:383)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.getVisibleStore(ChainedPreferenceStore.java:463)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.handlePropertyChangeEvent(ChainedPreferenceStore.java:347)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.access$0(ChainedPreferenceStore.java:342)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore$PropertyChangeListener.propertyChange(ChainedPreferenceStore.java:67)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.firePropertyChangeEvent(JavaEditor.java:390)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter$PreferenceChangeListener$1.run(JavaEditor.java:332)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:165)
	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:369)
	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.run(RefactoringWizardDialog2.java:321)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.internalPerformFinish(RefactoringWizard.java:636)
	at org.eclipse.ltk.ui.refactoring.UserInputWizardPage.performFinish(UserInputWizardPage.java:145)
	at org.eclipse.ltk.ui.refactoring.resource.DeleteResourcesWizard$DeleteResourcesRefactoringConfigurationPage.performFinish(DeleteResourcesWizard.java:202)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.performFinish(RefactoringWizard.java:710)
	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.okPressed(RefactoringWizardDialog2.java:447)
	at org.eclipse.jface.dialogs.Dialog.buttonPressed(Dialog.java:466)
	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:622)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)
	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.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:165)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:818)
	at org.eclipse.jface.window.Window.open(Window.java:794)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:188)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:203)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:122)
	at org.eclipse.ltk.internal.ui.refactoring.actions.DeleteResourcesHandler.execute(DeleteResourcesHandler.java:41)
	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:291)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
	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:498)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:282)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:264)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:494)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:488)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
	at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommandInContext(LegacyHandlerService.java:402)
	at org.eclipse.ui.internal.ide.actions.LTKLauncher.runCommand(LTKLauncher.java:96)
	at org.eclipse.ui.internal.ide.actions.LTKLauncher.openDeleteWizard(LTKLauncher.java:48)
	at org.eclipse.ui.actions.DeleteResourceAction.run(DeleteResourceAction.java:449)
	at org.eclipse.jdt.internal.ui.refactoring.reorg.DeleteAction.run(DeleteAction.java:194)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:271)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:249)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:473)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
	at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)
	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.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:165)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable.run(UIThreadRunnable.java:78)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable.asyncExec(UIThreadRunnable.java:223)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.asyncExec(AbstractSWTBot.java:598)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:154)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:135)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:125)
	at org.eclipse.swtbot.swt.finder.widgets.SWTBotMenu$1.run(SWTBotMenu.java:86)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1133)
	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:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:684)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
	at org.eclipse.tycho.surefire.osgibooter.UITestApplication.runApplication(UITestApplication.java:31)
	at org.eclipse.tycho.surefire.osgibooter.AbstractUITestApplication.run(AbstractUITestApplication.java:120)
	at org.eclipse.tycho.surefire.osgibooter.UITestApplication.start(UITestApplication.java:37)
	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(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1472)

!ENTRY org.eclipse.equinox.preferences 4 4 2017-05-02 08:00:54.958
!MESSAGE Exception loading preferences from: T:/src/github/google-cloud-eclipse/plugins/com.google.cloud.tools.eclipse.integration.appengine/target/work/data/testapp/.settings/org.eclipse.jdt.core.prefs.
!STACK 0
org.osgi.service.prefs.BackingStoreException: Exception loading preferences from: /testapp/.settings/org.eclipse.jdt.core.prefs.
	at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:515)
	at org.eclipse.core.internal.resources.ProjectPreferences.load(ProjectPreferences.java:492)
	at org.eclipse.core.internal.preferences.EclipsePreferences.create(EclipsePreferences.java:370)
	at org.eclipse.core.internal.preferences.EclipsePreferences.internalNode(EclipsePreferences.java:623)
	at org.eclipse.core.internal.preferences.EclipsePreferences.node(EclipsePreferences.java:766)
	at org.eclipse.core.resources.ProjectScope.getNode(ProjectScope.java:69)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.getNode(JavaEditor.java:363)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.contains(JavaEditor.java:383)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.getVisibleStore(ChainedPreferenceStore.java:463)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.handlePropertyChangeEvent(ChainedPreferenceStore.java:347)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore.access$0(ChainedPreferenceStore.java:342)
	at org.eclipse.ui.texteditor.ChainedPreferenceStore$PropertyChangeListener.propertyChange(ChainedPreferenceStore.java:67)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter.firePropertyChangeEvent(JavaEditor.java:390)
	at org.eclipse.jdt.internal.ui.javaeditor.JavaEditor$EclipsePreferencesAdapter$PreferenceChangeListener$1.run(JavaEditor.java:332)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:165)
	at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:369)
	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.run(RefactoringWizardDialog2.java:321)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.internalPerformFinish(RefactoringWizard.java:636)
	at org.eclipse.ltk.ui.refactoring.UserInputWizardPage.performFinish(UserInputWizardPage.java:145)
	at org.eclipse.ltk.ui.refactoring.resource.DeleteResourcesWizard$DeleteResourcesRefactoringConfigurationPage.performFinish(DeleteResourcesWizard.java:202)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizard.performFinish(RefactoringWizard.java:710)
	at org.eclipse.ltk.internal.ui.refactoring.RefactoringWizardDialog2.okPressed(RefactoringWizardDialog2.java:447)
	at org.eclipse.jface.dialogs.Dialog.buttonPressed(Dialog.java:466)
	at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:622)
	at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:249)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)
	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.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:165)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:818)
	at org.eclipse.jface.window.Window.open(Window.java:794)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:188)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:203)
	at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:122)
	at org.eclipse.ltk.internal.ui.refactoring.actions.DeleteResourcesHandler.execute(DeleteResourcesHandler.java:41)
	at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:291)
	at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:90)
	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:498)
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:55)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:282)
	at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:264)
	at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:132)
	at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:152)
	at org.eclipse.core.commands.Command.executeWithChecks(Command.java:494)
	at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:488)
	at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
	at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommandInContext(LegacyHandlerService.java:402)
	at org.eclipse.ui.internal.ide.actions.LTKLauncher.runCommand(LTKLauncher.java:96)
	at org.eclipse.ui.internal.ide.actions.LTKLauncher.openDeleteWizard(LTKLauncher.java:48)
	at org.eclipse.ui.actions.DeleteResourceAction.run(DeleteResourceAction.java:449)
	at org.eclipse.jdt.internal.ui.refactoring.reorg.DeleteAction.run(DeleteAction.java:194)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:271)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:249)
	at org.eclipse.jface.action.Action.runWithEvent(Action.java:473)
	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
	at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:86)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4431)
	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.swtbot.swt.finder.widgets.AbstractSWTBot$2.run(AbstractSWTBot.java:165)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable.run(UIThreadRunnable.java:78)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable.asyncExec(UIThreadRunnable.java:223)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.asyncExec(AbstractSWTBot.java:598)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:154)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:135)
	at org.eclipse.swtbot.swt.finder.widgets.AbstractSWTBot.notify(AbstractSWTBot.java:125)
	at org.eclipse.swtbot.swt.finder.widgets.SWTBotMenu$1.run(SWTBotMenu.java:86)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$5.doRun(UIThreadRunnable.java:221)
	at org.eclipse.swtbot.swt.finder.finders.UIThreadRunnable$1.run(UIThreadRunnable.java:89)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4216)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3823)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1133)
	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:153)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:684)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
	at org.eclipse.tycho.surefire.osgibooter.UITestApplication.runApplication(UITestApplication.java:31)
	at org.eclipse.tycho.surefire.osgibooter.AbstractUITestApplication.run(AbstractUITestApplication.java:120)
	at org.eclipse.tycho.surefire.osgibooter.UITestApplication.start(UITestApplication.java:37)
	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(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1472)
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 39.204 sec <<< FAILURE! - in com.google.cloud.tools.eclipse.integration.appengine.DebugNativeAppEngineStandardProjectTest
testDebugLaunch(com.google.cloud.tools.eclipse.integration.appengine.DebugNativeAppEngineStandardProjectTest)  Time elapsed: 37.594 sec  <<< FAILURE!
java.lang.AssertionError: No App Engine launch found
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.assertTrue(Assert.java:41)
	at com.google.cloud.tools.eclipse.integration.appengine.DebugNativeAppEngineStandardProjectTest.testDebugLaunch(DebugNativeAppEngineStandardProjectTest.java:107)

[chanseokoh]

Saw this error today: Kokoro Windows continuous build #50. This time, there wasn't the preference loading error.

[chanseokoh]

The assertion checks the first tree item in the Debug view, which should be "App Engine Standard at localhost":

Might be worth logging the actual offending value when this happens.

[briandealwis]

The preferences logging error is because we have open editors which receive a notice that a preference has changed. Should be fixed as part of #2047.

[chanseokoh]

I hope this doesn't happen anymore with #2047, but let's keep an eye on this. In the case of #1975 (comment), I think the text of the only tree item was empty, not that there was a terminated launch.