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java.lang.NullPointerException: 	at org.springframework.ide.eclipse.aop.ui.navigator.model.AbstractJavaElementReferenceNode.getResource(AbstractJavaElementReferenceNode.java:67)	at org.springframework.ide.eclipse.aop.ui.navigator.AopReferenceModelNavigatorLabelProvider.getDescription(AopReferenceModelNavigatorLabelProvider.java:39)	at org.eclipse.ui.internal.navigator.NavigatorContentServiceDescriptionProvider.getDescription(NavigatorContentServiceDescriptionProvider.java:72)	at org.eclipse.ui.internal.navigator.CommonNavigatorManager.updateStatusBar(CommonNavigatorManager.java:311)	at org.eclipse.ui.internal.navigator.CommonNavigatorManager$1.selectionChanged(CommonNavigatorManager.java:82)	at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:842)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)	at org.eclipse.core.runtime.Platform.run(Platform.java:880)	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)	at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:840)	at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1153)	at org.eclipse.ui.navigator.CommonViewer.handlePostSelect(CommonViewer.java:380)	at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1178)	at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:250)	at org.eclipse.jface.util.OpenStrategy.access$4(OpenStrategy.java:244)	at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:418)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:133)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3800)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3425)	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)	at org.eclipse.equinox.launcher.Main.run(Main.java:1236)