Closing a CDT project somethimes reloads it on the spot. (project not open in project explorer)

[jantje]

While I was testing the persistency of my autobuild plugin by opening and closing the project I noticed that sometimes the project gets loaded at (or around) closing time.
When this happened the project looked closed but when I open it eclipse did not trigger my loading code as once should expect during opening of a project.
The stacktrace is pretty big with lots of repititions (I still thought it was best to dump the whole thing)
I'm not sure this is a CDT issue but adding a "is the project open" test to the isNewStyleProject implementations or even to the getProjectDescription may be a good workaround/solution.

org.eclipse.core.internal.resources.ResourceException(/001_all_gnu_cross_shared_lib_cdt_cross_gnu)[372]: java.lang.Exception: Project '001_all_gnu_cross_shared_lib_cdt_cross_gnu' is not open.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:186)
	at org.eclipse.core.internal.resources.Project.hasNature(Project.java:564)
	at io.sloeber.schema.internal.Tool.isEnabled(Tool.java:143)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.options_updateDefault(AutoBuildConfigurationDescription.java:557)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.<init>(AutoBuildConfigurationDescription.java:429)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescriptionProvider.loadConfiguration(AutoBuildConfigurationDescriptionProvider.java:98)
	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:139)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:199)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:509)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:239)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
org.eclipse.core.internal.resources.ResourceException(/001_all_gnu_cross_shared_lib_cdt_cross_gnu)[372]: java.lang.Exception: Project '001_all_gnu_cross_shared_lib_cdt_cross_gnu' is not open.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:186)
	at org.eclipse.core.internal.resources.Project.hasNature(Project.java:564)
	at io.sloeber.schema.internal.Tool.isEnabled(Tool.java:145)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.options_updateDefault(AutoBuildConfigurationDescription.java:557)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.<init>(AutoBuildConfigurationDescription.java:429)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescriptionProvider.loadConfiguration(AutoBuildConfigurationDescriptionProvider.java:98)
	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:139)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:199)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:509)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:239)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
org.eclipse.core.internal.resources.ResourceException(/001_all_gnu_cross_shared_lib_cdt_cross_gnu)[372]: java.lang.Exception: Project '001_all_gnu_cross_shared_lib_cdt_cross_gnu' is not open.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:186)
	at org.eclipse.core.internal.resources.Project.hasNature(Project.java:564)
	at io.sloeber.schema.internal.Tool.isEnabled(Tool.java:145)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.options_updateDefault(AutoBuildConfigurationDescription.java:557)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.<init>(AutoBuildConfigurationDescription.java:429)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescriptionProvider.loadConfiguration(AutoBuildConfigurationDescriptionProvider.java:98)
	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:139)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:199)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:509)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:239)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
org.eclipse.core.internal.resources.ResourceException(/001_all_gnu_cross_shared_lib_cdt_cross_gnu)[372]: java.lang.Exception: Project '001_all_gnu_cross_shared_lib_cdt_cross_gnu' is not open.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:186)
	at org.eclipse.core.internal.resources.Project.hasNature(Project.java:564)
	at io.sloeber.schema.internal.Tool.isEnabled(Tool.java:143)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.options_updateDefault(AutoBuildConfigurationDescription.java:557)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.<init>(AutoBuildConfigurationDescription.java:429)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescriptionProvider.loadConfiguration(AutoBuildConfigurationDescriptionProvider.java:98)
	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:139)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:199)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:509)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:239)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
org.eclipse.core.internal.resources.ResourceException(/001_all_gnu_cross_shared_lib_cdt_cross_gnu)[372]: java.lang.Exception: Project '001_all_gnu_cross_shared_lib_cdt_cross_gnu' is not open.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:186)
	at org.eclipse.core.internal.resources.Project.hasNature(Project.java:564)
	at io.sloeber.schema.internal.Tool.isEnabled(Tool.java:145)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.options_updateDefault(AutoBuildConfigurationDescription.java:557)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.<init>(AutoBuildConfigurationDescription.java:429)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescriptionProvider.loadConfiguration(AutoBuildConfigurationDescriptionProvider.java:98)
	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:139)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:199)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:509)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:239)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
org.eclipse.core.internal.resources.ResourceException(/001_all_gnu_cross_shared_lib_cdt_cross_gnu)[372]: java.lang.Exception: Project '001_all_gnu_cross_shared_lib_cdt_cross_gnu' is not open.
	at org.eclipse.core.internal.resources.ResourceException.provideStackTrace(ResourceException.java:42)
	at org.eclipse.core.internal.resources.ResourceException.<init>(ResourceException.java:38)
	at org.eclipse.core.internal.resources.Project.checkAccessible(Project.java:186)
	at org.eclipse.core.internal.resources.Project.hasNature(Project.java:564)
	at io.sloeber.schema.internal.Tool.isEnabled(Tool.java:145)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.options_updateDefault(AutoBuildConfigurationDescription.java:557)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescription.<init>(AutoBuildConfigurationDescription.java:429)
	at io.sloeber.autoBuild.integration.AutoBuildConfigurationDescriptionProvider.loadConfiguration(AutoBuildConfigurationDescriptionProvider.java:98)
	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:139)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:199)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:509)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:239)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)

!ENTRY org.eclipse.cdt.core 4 0 2023-12-05 17:21:44.417
!MESSAGE Error
!STACK 1
org.eclipse.core.runtime.CoreException: attempt to set description for a project which does not exist or not open
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.setCurrentDescription(XmlProjectDescriptionStorage.java:382)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.setLoaddedDescriptionOnLoad(XmlProjectDescriptionStorage.java:360)
	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:258)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:426)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:408)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:402)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:395)
	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.isNewStyleProject(CProjectDescriptionManager.java:2464)
	at org.eclipse.cdt.core.model.CoreModel.isNewStyleProject(CoreModel.java:1457)
	at org.eclipse.cdt.ui.newui.ManageConfigSelector.getProjects(ManageConfigSelector.java:104)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.hasManagedCdtProjectSelection(HasManagedCdtProjectSelection.java:43)
	at org.eclipse.cdt.internal.ui.workingsets.HasManagedCdtProjectSelection.test(HasManagedCdtProjectSelection.java:33)
	at org.eclipse.core.internal.expressions.Property.test(Property.java:65)
	at org.eclipse.core.expressions.TestExpression.evaluate(TestExpression.java:107)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:79)
	at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:109)
	at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:103)
	at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:105)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:358)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:374)
	at org.eclipse.e4.core.internal.contexts.EclipseContext.deactivate(EclipseContext.java:681)
	at org.eclipse.e4.ui.workbench.renderers.swt.MenuManagerHideProcessor.lambda$1(MenuManagerHideProcessor.java:144)
	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:132)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4047)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3663)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1046)
	at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
	at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:645)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:342)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:552)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:171)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.runApp(NonUIThreadTestApplication.java:57)
	at org.eclipse.pde.internal.junit.runtime.NonUIThreadTestApplication.start(NonUIThreadTestApplication.java:52)
	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:402)
	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:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
!SUBENTRY 1 org.eclipse.cdt.core 4 -1 2023-12-05 17:21:44.420
!MESSAGE attempt to set description for a project which does not exist or not open

[jantje]

I added a isOpen to the getProjectDescription and the problem persists
It seems using isOpen will not do the trick

	public ICProjectDescription getProjectDescription(IProject project, boolean load, boolean write) {
		int flags = load ? 0 : GET_IF_LOADDED;
		flags |= write ? GET_WRITABLE : 0;
		if (project.isOpen()) {
			return getProjectDescription(project, flags);
		}
		return null;
	}

[jantje]

I had this issue again and found a way to reproduce and fix the issue.
The fix is a change in CprojecDescriptionManager

	public boolean isNewStyleProject(IProject project) {
		return isNewStyleProject(getProjectDescription(project,  false));
	}

Should be changed to

	public boolean isNewStyleProject(IProject project) {
		return isNewStyleProject(getProjectDescription(project, false, false));
	}

How I Identified this problem.
The stacktrace showed isNewStyleProject was called for some reason.
I noticed it was called when the project is selected in the project explorer so I put a breakpoint in isNewStyleProject but that made my debug session hang.
So I changed isNewStyleProject to:

	public boolean isNewStyleProject(IProject project) {
		System.out.println("calling isNewStyleProject for project " + project.getName());
		return isNewStyleProject(getProjectDescription(project, false));
	}

This way I discovered isNewStyleProject is called several times when it is selected in the project explorer even when the project is closed.
Because getProjectDescription(project, false) translates to getProjectDescription(project, true, false) which means "load the project when it is not yet loaded" all closed CDT projects are loaded when they are selected in the project explorer.
The CDT project loading triggers events in Sloeber that bounce because the project is not open.

[jonahgraham]

(I made a comment expressing concerns on the specific fix provided in #725)

Is it possible that some changes are being made without a workspace lock so that one thread is closing project at same time as another thread is trying to look something up, causing project to reopen?