java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringInputPage$3.update(PushInRefactoringInputPage.java:314)
at org.eclipse.jface.viewers.ViewerColumn.refresh(ViewerColumn.java:141)
at org.eclipse.jface.viewers.AbstractTableViewer.doUpdateItem(AbstractTableViewer.java:382)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:173)
at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:2170)
at org.eclipse.jface.viewers.AbstractTableViewer.createItem(AbstractTableViewer.java:273)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefreshAll(AbstractTableViewer.java:715)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:607)
at org.eclipse.jface.viewers.AbstractTableViewer.internalRefresh(AbstractTableViewer.java:599)
at org.eclipse.jface.viewers.AbstractTableViewer.lambda$0(AbstractTableViewer.java:561)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1458)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1419)
at org.eclipse.jface.viewers.AbstractTableViewer.inputChanged(AbstractTableViewer.java:561)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:286)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringInputPage.createTable(PushInRefactoringInputPage.java:229)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringInputPage.createControl(PushInRefactoringInputPage.java:172)
at org.eclipse.jface.window.Window.create(Window.java:426)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation$1.run(RefactoringWizardOpenOperation.java:179)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:203)
at org.eclipse.ltk.ui.refactoring.RefactoringWizardOpenOperation.run(RefactoringWizardOpenOperation.java:122)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringAction.run(PushInRefactoringAction.java:84)
at org.eclipse.ajdt.internal.ui.refactoring.PushInRefactoringAction.run(PushInRefactoringAction.java:60)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4410)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4228)
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:388)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)

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