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org.eclipse.jface.util.Assert$AssertionFailedException: null argument; at org.eclipse.jface.util.Assert.isNotNull(Assert.java:139) at org.eclipse.jface.util.Assert.isNotNull(Assert.java:116) at org.eclipse.ui.views.properties.ResourcePropertySource.<init>(ResourcePropertySource.java:132) at org.springframework.ide.eclipse.beans.ui.model.properties.RootBeanProperties$TypeResourcePropertySource.<init>(RootBeanProperties.java:155) at org.springframework.ide.eclipse.beans.ui.model.properties.RootBeanProperties.getPropertyValue(RootBeanProperties.java:106) at org.eclipse.ui.views.properties.PropertySheetEntry.refreshValues(PropertySheetEntry.java:509) at org.eclipse.ui.views.properties.PropertySheetEntry.refreshChildEntries(PropertySheetEntry.java:472) at org.eclipse.ui.views.properties.PropertySheetEntry.setValues(PropertySheetEntry.java:641) at org.eclipse.ui.views.properties.PropertySheetViewer.setInput(PropertySheetViewer.java:807) at org.eclipse.ui.views.properties.PropertySheetPage.selectionChanged(PropertySheetPage.java:370) at org.eclipse.ui.views.properties.PropertySheet.selectionChanged(PropertySheet.java:185) at org.eclipse.ui.internal.AbstractSelectionService$3.run(AbstractSelectionService.java:153) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:615) at org.eclipse.core.runtime.Platform.run(Platform.java:758) at org.eclipse.ui.internal.AbstractSelectionService.fireSelection(AbstractSelectionService.java:151) at org.eclipse.ui.internal.AbstractSelectionService$1.selectionChanged(AbstractSelectionService.java:66) at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:159) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:615) at org.eclipse.core.runtime.Platform.run(Platform.java:758) at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:157) at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:1389) at org.eclipse.jface.viewers.StructuredViewer.handleSelect(StructuredViewer.java:695) at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:721) at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:180) at org.eclipse.jface.util.OpenStrategy.access$3(OpenStrategy.java:175) at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:324) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:796) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2732) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2398) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1375) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1346) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:252) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:141) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:96) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:335) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:272) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:128) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.core.launcher.Main.basicRun(Main.java:186) at org.eclipse.core.launcher.Main.run(Main.java:647) at org.eclipse.core.launcher.Main.main(Main.java:631)