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java.lang.NullPointerException: 	at org.eclipse.osgi.framework.util.KeyedHashSet.hash(KeyedHashSet.java:376)	at org.eclipse.osgi.framework.util.KeyedHashSet.add(KeyedHashSet.java:83)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findRequiredSource(BundleLoader.java:1103)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:440)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:399)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:387)	at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:87)	at java.lang.ClassLoader.loadClass(Unknown Source)	at java.lang.ClassLoader.loadClassInternal(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansProject.hashCode(BeansProject.java:699)	at java.util.HashMap.put(Unknown Source)	at java.util.HashSet.add(Unknown Source)	at java.util.AbstractCollection.addAll(Unknown Source)	at java.util.HashSet.(Unknown Source)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModel.getProjects(BeansModel.java:194)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModel.getConfig(BeansModel.java:215)	at org.springframework.ide.eclipse.beans.core.BeansCoreUtils.isBeansConfig(BeansCoreUtils.java:43)	at org.springframework.ide.eclipse.beans.core.internal.model.BeansModelPropertyTester.test(BeansModelPropertyTester.java:39)	at org.eclipse.core.internal.expressions.Property.test(Property.java:58)	at org.eclipse.core.internal.expressions.TestExpression.evaluate(TestExpression.java:99)	at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:53)	at org.eclipse.core.internal.expressions.AndExpression.evaluate(AndExpression.java:29)	at org.eclipse.core.internal.expressions.CompositeExpression.evaluateOr(CompositeExpression.java:68)	at org.eclipse.core.internal.expressions.OrExpression.evaluate(OrExpression.java:21)	at org.eclipse.ui.internal.navigator.CustomAndExpression.evaluate(CustomAndExpression.java:70)	at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptor.isPossibleChild(NavigatorContentDescriptor.java:370)	at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.findDescriptorsForPossibleChild(NavigatorContentDescriptorManager.java:266)	at org.eclipse.ui.internal.navigator.NavigatorContentService.findDescriptorsWithPossibleChild(NavigatorContentService.java:773)	at org.eclipse.ui.internal.navigator.NavigatorContentService.findOverrideableContentExtensionsForPossibleChild(NavigatorContentService.java:534)	at org.eclipse.ui.internal.navigator.NavigatorPipelineService.interceptUpdate(NavigatorPipelineService.java:306)	at org.eclipse.ui.navigator.CommonViewer.update(CommonViewer.java:440)	at org.eclipse.jface.viewers.StructuredViewer.update(StructuredViewer.java:1908)	at org.eclipse.jface.viewers.StructuredViewer.handleLabelProviderChanged(StructuredViewer.java:1118)	at org.eclipse.ui.navigator.CommonViewer.handleLabelProviderChanged(CommonViewer.java:177)	at org.eclipse.jface.viewers.ContentViewer$1.labelProviderChanged(ContentViewer.java:97)	at org.eclipse.jface.viewers.BaseLabelProvider$1.run(BaseLabelProvider.java:74)	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.BaseLabelProvider.fireLabelProviderChanged(BaseLabelProvider.java:72)	at org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider$1.labelProviderChanged(DecoratingStyledCellLabelProvider.java:77)	at org.eclipse.ui.internal.decorators.DecoratorManager$1.run(DecoratorManager.java:430)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)	at org.eclipse.ui.internal.decorators.DecoratorManager.fireListener(DecoratorManager.java:428)	at org.eclipse.ui.internal.decorators.DecorationScheduler$3.runInUIThread(DecorationScheduler.java:533)	at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:94)	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:2384)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2348)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2200)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:495)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:490)	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:386)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)	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.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)