Selecting a method in text results in a null pointer exception

[khatchad]

Selecting a method in the text editor and then running the refactoring results in a java.lang.NullPointerException. The reason is that org.eclipse.jdt.internal.ui.util.SelectionUtil.toList(ISelection) is returning null given the text selection.

java.lang.NullPointerException
at edu.cuny.citytech.defaultrefactoring.ui.handlers.MigrateSkeletalImplementationToInterfaceHandler.execute(MigrateSkeletalImplementationToInterfaceHandler.java:32)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:295)
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:497)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:252)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:234)
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:493)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:486)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:210)
at org.eclipse.ui.internal.handlers.LegacyHandlerService.executeCommand(LegacyHandlerService.java:343)
at org.eclipse.ui.internal.quickaccess.CommandElement.execute(CommandElement.java:72)
at org.eclipse.ui.internal.quickaccess.SearchField$2.handleElementSelected(SearchField.java:179)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.handleSelection(QuickAccessContents.java:460)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents.access$0(QuickAccessContents.java:450)
at org.eclipse.ui.internal.quickaccess.QuickAccessContents$1.keyPressed(QuickAccessContents.java:495)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:167)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1528)
at org.eclipse.swt.widgets.Text.sendKeyEvent(Text.java:1662)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1524)
at org.eclipse.swt.widgets.Text.sendKeyEvent(Text.java:1627)
at org.eclipse.swt.widgets.Control.doCommandBySelector(Control.java:1060)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5784)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227)
at org.eclipse.swt.widgets.Widget.superKeyDown(Widget.java:1932)
at org.eclipse.swt.widgets.Widget.keyDown(Widget.java:1105)
at org.eclipse.swt.widgets.Control.keyDown(Control.java:2406)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5694)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Widget.callSuper(Widget.java:227)
at org.eclipse.swt.widgets.Widget.windowSendEvent(Widget.java:2130)
at org.eclipse.swt.widgets.Shell.windowSendEvent(Shell.java:2337)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5756)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSendSuper(Native Method)
at org.eclipse.swt.widgets.Display.applicationSendEvent(Display.java:5193)
at org.eclipse.swt.widgets.Display.applicationProc(Display.java:5342)
at org.eclipse.swt.internal.cocoa.OS.objc_msgSend(Native Method)
at org.eclipse.swt.internal.cocoa.NSApplication.sendEvent(NSApplication.java:128)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3695)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
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:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
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:497)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
at org.eclipse.equinox.launcher.Main.run(Main.java:1515)
at org.eclipse.equinox.launcher.Main.main(Main.java:1488)