NPE in RenameInformationPopup

Currently i am stuck in this NPE, whatever UI action i do (for example open java editor) this error repeats once it started:

```
eclipse.buildId=4.35.0.I20241201-1800
java.version=21.0.2
java.vendor=Eclipse Adoptium
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_DE
Command-line arguments: -os win32 -ws win32 -arch x86_64

org.eclipse.ui.workbench
Error
Tue Dec 03 10:41:39 CET 2024
Problems occurred when invoking code from plug-in: "org.eclipse.ui.workbench".

java.lang.NullPointerException: Cannot invoke "org.eclipse.ui.IEditorSite.getPart()" because the return value of "org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.getEditorSite()" is null
at org.eclipse.jdt.internal.ui.refactoring.reorg.RenameInformationPopup$PopupVisibilityManager.partActivated(RenameInformationPopup.java:137)
at org.eclipse.ui.internal.PartService$6.run(PartService.java:145)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
at org.eclipse.ui.internal.PartService.partActivated(PartService.java:142)
at org.eclipse.ui.internal.WorkbenchPage$3.run(WorkbenchPage.java:4896)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
at org.eclipse.ui.internal.WorkbenchPage.firePartActivated(WorkbenchPage.java:4893)
at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partActivated(WorkbenchPage.java:215)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$2.run(PartServiceImpl.java:250)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartActivated(PartServiceImpl.java:247)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:780)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:686)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.activate(PartServiceImpl.java:681)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.bringToTop(PartServiceImpl.java:395)
at org.eclipse.ui.internal.WorkbenchPage.bringToTop(WorkbenchPage.java:1022)
at org.eclipse.ui.internal.views.log.LogView.lambda$14(LogView.java:1244)
at org.eclipse.jface.util.Throttler.lambda$0(Throttler.java:66)
at org.eclipse.jface.util.Throttler.lambda$1(Throttler.java:79)
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:4177)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3793)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
at org.eclipse.jface.window.Window.open(Window.java:799)
at org.eclipse.ui.internal.views.log.EventDetailsDialog.open(EventDetailsDialog.java:198)
at org.eclipse.ui.internal.views.log.EventDetailsDialogAction.run(EventDetailsDialogAction.java:108)
at org.eclipse.ui.internal.views.log.LogView.lambda$2(LogView.java:624)
at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:779)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
at org.eclipse.jface.viewers.StructuredViewer.fireDoubleClick(StructuredViewer.java:776)
at org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1580)
at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1205)
at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:271)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:328)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4404)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1175)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4202)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3790)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:663)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:570)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:178)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:143)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:109)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:439)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:271)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:668)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:605)
at org.eclipse.equinox.launcher.Main.run(Main.java:1481)

```

and

```
java.lang.NullPointerException: Cannot invoke "org.eclipse.ui.IWorkbenchPartSite.getWorkbenchWindow()" because the return value of "org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.getSite()" is null
at org.eclipse.jdt.internal.ui.refactoring.reorg.RenameInformationPopup$PopupVisibilityManager.lambda$0(RenameInformationPopup.java:114)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:146)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:91)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4404)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1175)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1199)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1180)
at org.eclipse.swt.widgets.Widget.release(Widget.java:890)
at org.eclipse.swt.widgets.Widget.dispose(Widget.java:479)
at org.eclipse.swt.widgets.Decorations.dispose(Decorations.java:396)
at org.eclipse.swt.widgets.Decorations.closeWidget(Decorations.java:274)
at org.eclipse.swt.widgets.Shell.close(Shell.java:552)
at org.eclipse.jdt.internal.ui.refactoring.reorg.RenameInformationPopup.close(RenameInformationPopup.java:378)
at org.eclipse.jdt.internal.ui.refactoring.reorg.RenameLinkedMode.linkedModeLeft(RenameLinkedMode.java:623)
at org.eclipse.jdt.internal.ui.refactoring.reorg.RenameLinkedMode$EditorSynchronizer.left(RenameLinkedMode.java:120)
at org.eclipse.jface.text.link.LinkedModeModel.exit(LinkedModeModel.java:338)
at org.eclipse.jface.text.link.LinkedModeUI.lambda$2(LinkedModeUI.java:1240)
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:4177)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3793)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:663)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:570)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:178)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:143)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:109)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:439)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:271)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:668)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:605)
at org.eclipse.equinox.launcher.Main.run(Main.java:1481)
```


Start by reading org.eclipse.jdt.internal.ui.refactoring.reorg.RenameInformationPopup.java at lines 114 and 137, then reproduce the issue by opening the Java editor and interacting with the workbench. Trace the popup and editor lifecycle; done means the reported activation and disposal actions no longer produce these NullPointerExceptions.

Written by the indexing model from the issue text.