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java.lang.NullPointerException: 	at org.eclipse.jst.j2ee.application.internal.operations.ClasspathElement.getComponent(ClasspathElement.java:186)	at org.eclipse.jst.j2ee.internal.ClasspathTableManager.availableJARCheckStateChanged(ClasspathTableManager.java:469)	at org.eclipse.jst.j2ee.internal.ClasspathTableManager$1.checkStateChanged(ClasspathTableManager.java:450)	at org.eclipse.jface.viewers.CheckboxTableViewer$1.run(CheckboxTableViewer.java:178)	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.CheckboxTableViewer.fireCheckStateChanged(CheckboxTableViewer.java:176)	at org.eclipse.jface.viewers.CheckboxTableViewer.handleSelect(CheckboxTableViewer.java:266)	at org.eclipse.jface.viewers.StructuredViewer$4.widgetSelected(StructuredViewer.java:1168)	at org.eclipse.jface.util.OpenStrategy.fireSelectionEvent(OpenStrategy.java:227)	at org.eclipse.jface.util.OpenStrategy.access$3(OpenStrategy.java:221)	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:388)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)	at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)	at org.eclipse.jface.window.Window.open(Window.java:801)	at org.eclipse.ui.dialogs.PropertyDialogAction.run(PropertyDialogAction.java:157)	at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)	at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583)	at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500)	at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)	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:597)	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)	at org.eclipse.equinox.launcher.Main.main(Main.java:1212)