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I've did something like moving the class via DND with Project Explorer and saw this error in the log. Interestingly, I can't reproduce it, I miss some precondition. eclipse.buildId=4.16.0.I20200415-0200 java.version=1.8.0_181 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US Command-line arguments: -os linux -ws gtk -arch x86_64 org.eclipse.ltk.core.refactoring Error Thu Apr 16 22:30:26 CEST 2020 Participant 'org.eclipse.e4.tools.emf.editor3x.moveParticipant' removed due to the following exception java.lang.ClassCastException: org.eclipse.core.internal.resources.Folder cannot be cast to org.eclipse.jdt.core.IPackageFragment at org.eclipse.e4.tools.emf.editor3x.refactorparticipants.ModelMoveParticipant.createClassChange(ModelMoveParticipant.java:149) at org.eclipse.e4.tools.emf.editor3x.refactorparticipants.ModelMoveParticipant.createChange(ModelMoveParticipant.java:83) at org.eclipse.ltk.core.refactoring.participants.ProcessorBasedRefactoring.createChange(ProcessorBasedRefactoring.java:306) at org.eclipse.jdt.internal.ui.refactoring.RefactoringExecutionHelper$Operation.run(RefactoringExecutionHelper.java:102) at org.eclipse.jdt.internal.core.BatchOperation.executeOperation(BatchOperation.java:41) at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:736) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2292) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2317) at org.eclipse.jdt.core.JavaCore.run(JavaCore.java:5896) at org.eclipse.jdt.internal.ui.actions.WorkbenchRunnableAdapter.run(WorkbenchRunnableAdapter.java:108) at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:436) at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:352) at org.eclipse.ui.internal.WorkbenchWindow.lambda$5(WorkbenchWindow.java:2375) at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:72) at org.eclipse.ui.internal.WorkbenchWindow.run(WorkbenchWindow.java:2373) at org.eclipse.jdt.internal.ui.refactoring.RefactoringExecutionHelper.perform(RefactoringExecutionHelper.java:197) at org.eclipse.jdt.internal.ui.refactoring.RefactoringExecutionHelper.perform(RefactoringExecutionHelper.java:156) at org.eclipse.jdt.internal.ui.refactoring.reorg.ReorgMoveStarter.run(ReorgMoveStarter.java:73) at org.eclipse.jdt.internal.ui.packageview.SelectionTransferDropAdapter.handleDropMove(SelectionTransferDropAdapter.java:268) at org.eclipse.jdt.internal.ui.packageview.SelectionTransferDropAdapter.performDrop(SelectionTransferDropAdapter.java:205) at org.eclipse.jdt.internal.ui.dnd.JdtViewerDropAdapter.drop(JdtViewerDropAdapter.java:252) at org.eclipse.jface.util.DelegatingDropAdapter$3.run(DelegatingDropAdapter.java:227) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174) at org.eclipse.jface.util.DelegatingDropAdapter.drop(DelegatingDropAdapter.java:224) at org.eclipse.swt.dnd.DNDListener.handleEvent(DNDListener.java:94) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89) at org.eclipse.swt.widgets.Display.sendEvent(Display.java:5685) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1423) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1449) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1432) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1221) at org.eclipse.swt.dnd.DropTarget.drag_data_received(DropTarget.java:365) at org.eclipse.swt.dnd.DropTarget.Drag_Data_Received(DropTarget.java:242) at org.eclipse.swt.internal.gtk.GTK.gtk_drag_get_data(Native Method) at org.eclipse.swt.dnd.DropTarget.drag_drop(DropTarget.java:410) at org.eclipse.swt.dnd.DropTarget.Drag_Drop(DropTarget.java:249) at org.eclipse.swt.internal.gtk.GTK.gtk_main_do_event(Native Method) at org.eclipse.swt.widgets.Display.eventProc(Display.java:1486) at org.eclipse.swt.internal.gtk.OS.g_main_context_iteration(Native Method) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4444) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1049) at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155) at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255) 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:657) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594) at org.eclipse.equinox.launcher.Main.run(Main.java:1447) at org.eclipse.equinox.launcher.Main.main(Main.java:1420)
