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help needed: Today i got an error log entry "To avoid deadlock while executing Display.syncExec() from a non UI thread 'Text Viewer Hover Presenter', operation was cancelled." I don't know what it means but sounds like a programming bug: A background thread should not ask the SWT thread for the active selection but get it pushed from GUI. I do not know how to reproduces. just happened during normal work. maybe just move org.eclipse.jface.text.TextViewerHoverManager:155 (getHoverInfo2) out of the backgroundthread to TextViewerHoverManager:144? child1: "UI thread waiting on a job or lock." java.lang.IllegalStateException: Call stack for thread main at org.eclipse.core.internal.resources.Resource.getResourceInfo(Resource.java:1177) at org.eclipse.core.internal.resources.Project.hasNature(Project.java:525) at org.eclipse.jdt.internal.core.JavaProject.hasJavaNature(JavaProject.java:380) at org.eclipse.jdt.internal.core.JavaProject.getEclipsePreferences(JavaProject.java:1887) at org.eclipse.jdt.internal.core.JavaProject.getOption(JavaProject.java:2117) at org.eclipse.jdt.internal.core.JavaModelManager.determineIfOnClasspath(JavaModelManager.java:1169) at org.eclipse.jdt.internal.core.JavaModelManager.create(JavaModelManager.java:1058) at org.eclipse.jdt.core.JavaCore.create(JavaCore.java:3593) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getHierarchicalPackagesInFolder(PackageExplorerContentProvider.java:490) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getFolderContent(PackageExplorerContentProvider.java:284) at org.eclipse.jdt.ui.StandardJavaElementContentProvider.getChildren(StandardJavaElementContentProvider.java:190) at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getChildren(PackageExplorerContentProvider.java:309) at org.eclipse.jdt.internal.ui.navigator.JavaNavigatorContentProvider.getChildren(JavaNavigatorContentProvider.java:177) at org.eclipse.jdt.ui.StandardJavaElementContentProvider.hasChildren(StandardJavaElementContentProvider.java:237) at org.eclipse.jdt.internal.ui.navigator.JavaNavigatorContentProvider.hasChildren(JavaNavigatorContentProvider.java:165) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.hasChildren(SafeDelegateTreeContentProvider.java:113) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.callNormalHasChildren(NavigatorContentServiceContentProvider.java:445) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.pipelineHasChildren(NavigatorContentServiceContentProvider.java:464) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider$3.run(NavigatorContentServiceContentProvider.java:414) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.hasChildren(NavigatorContentServiceContentProvider.java:393) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.hasChildren(NavigatorContentServiceContentProvider.java:437) at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2165) at org.eclipse.jface.viewers.TreeViewer.isExpandable(TreeViewer.java:546) at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2203) at org.eclipse.jface.viewers.AbstractTreeViewer.optionallyPruneChildren(AbstractTreeViewer.java:2837) at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2636) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1960) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:677) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1966) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:677) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1966) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:677) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1936) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1893) at org.eclipse.ui.navigator.CommonViewer.internalRefresh(CommonViewer.java:532) at org.eclipse.jface.viewers.StructuredViewer.lambda$3(StructuredViewer.java:1484) at org.eclipse.jface.viewers.StructuredViewer$$Lambda$544/0x0000000800b8fc40.run(Unknown Source) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1400) at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:363) at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1361) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1484) at org.eclipse.jface.viewers.ColumnViewer.refresh(ColumnViewer.java:538) at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:352) at org.eclipse.ui.navigator.CommonViewer.refresh(CommonViewer.java:495) at org.eclipse.jface.viewers.StructuredViewer.refresh(StructuredViewer.java:1420) at org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider$WorkingSetManagerListener.propertyChange(WorkingSetActionProvider.java:118) at org.eclipse.ui.internal.AbstractWorkingSetManager$5.run(AbstractWorkingSetManager.java:378) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45) at org.eclipse.ui.internal.AbstractWorkingSetManager.lambda$1(AbstractWorkingSetManager.java:386) at org.eclipse.ui.internal.AbstractWorkingSetManager$$Lambda$252/0x00000008006b6440.run(Unknown Source) 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:4001) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3629) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1157) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) 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:644) at org.eclipse.ui.internal.Workbench$$Lambda$148/0x000000080044d840.run(Unknown Source) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:551) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:156) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:152) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203) 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:401) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255) at java.base@11.0.9.1/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base@11.0.9.1/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base@11.0.9.1/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base@11.0.9.1/java.lang.reflect.Method.invoke(Method.java:566) at app//org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:654) at app//org.eclipse.equinox.launcher.Main.basicRun(Main.java:591) at app//org.eclipse.equinox.launcher.Main.run(Main.java:1462) at app//org.eclipse.equinox.launcher.Main.main(Main.java:1435) child2: java.lang.IllegalStateException: Call stack for thread Text Viewer Hover Presenter at java.management@11.0.9.1/sun.management.ThreadImpl.dumpThreads0(Native Method) at java.management@11.0.9.1/sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:485) at org.eclipse.debug.internal.ui.stringsubstitution.SelectedResourceManager.reportTimeout(SelectedResourceManager.java:297) at org.eclipse.debug.internal.ui.stringsubstitution.SelectedResourceManager.getFromUI(SelectedResourceManager.java:243) at org.eclipse.debug.internal.ui.stringsubstitution.SelectedResourceManager.getActiveWindow(SelectedResourceManager.java:231) at org.eclipse.debug.ui.DebugUITools.getDebugContext(DebugUITools.java:248) at org.eclipse.jdt.internal.debug.ui.JavaDebugHover.getFrame(JavaDebugHover.java:109) at org.eclipse.jdt.internal.debug.ui.JavaDebugHover.getHoverInfo2(JavaDebugHover.java:263) at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:163) at org.eclipse.jdt.internal.ui.text.java.hover.BestMatchHover.getHoverInfo2(BestMatchHover.java:130) at org.eclipse.jdt.internal.ui.text.java.hover.JavaEditorTextHoverProxy.getHoverInfo2(JavaEditorTextHoverProxy.java:89) at org.eclipse.jface.text.TextViewerHoverManager$1.run(TextViewerHoverManager.java:155)
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
