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java.lang.IllegalArgumentException: Project facet spring.core has not been defined.	at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectFrameworkImpl.getProjectFacet(FacetedProjectFrameworkImpl.java:236)	at org.eclipse.wst.common.project.facet.core.ProjectFacetsManager.getProjectFacet(ProjectFacetsManager.java:75)	at org.eclipse.jst.common.project.facet.core.libprov.osgi.internal.OsgiBundlesContainerImpl.(OsgiBundlesContainerImpl.java:56)	at org.eclipse.jst.common.project.facet.core.libprov.osgi.internal.OsgiBundlesContainerImpl.(OsgiBundlesContainerImpl.java:50)	at org.eclipse.jst.common.project.facet.core.libprov.osgi.internal.OsgiBundlesContainerImpl$Initializer.initialize(OsgiBundlesContainerImpl.java:143)	at org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:2615)	at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:1779)	at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:2652)	at org.eclipse.jdt.internal.ui.packageview.ClassPathContainer.(ClassPathContainer.java:97)	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getPackageFragmentRoots(PackageExplorerContentProvider.java:354)	at org.eclipse.jdt.ui.StandardJavaElementContentProvider.getChildren(StandardJavaElementContentProvider.java:183)	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getChildren(PackageExplorerContentProvider.java:301)	at org.eclipse.jdt.ui.StandardJavaElementContentProvider.hasChildren(StandardJavaElementContentProvider.java:241)	at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2083)	at org.eclipse.jface.viewers.TreeViewer.isExpandable(TreeViewer.java:587)	at org.eclipse.jdt.internal.ui.viewsupport.ProblemTreeViewer.isExpandable(ProblemTreeViewer.java:246)	at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2109)	at org.eclipse.jface.viewers.AbstractTreeViewer.updatePlus(AbstractTreeViewer.java:2791)	at org.eclipse.jface.viewers.TreeViewer.updatePlus(TreeViewer.java:847)	at org.eclipse.jface.viewers.AbstractTreeViewer.createTreeItem(AbstractTreeViewer.java:828)	at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:802)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:776)	at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:639)	at org.eclipse.jface.viewers.AbstractTreeViewer.internalInitializeTree(AbstractTreeViewer.java:1490)	at org.eclipse.jface.viewers.TreeViewer.internalInitializeTree(TreeViewer.java:828)	at org.eclipse.jface.viewers.AbstractTreeViewer$5.run(AbstractTreeViewer.java:1474)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1392)	at org.eclipse.jface.viewers.TreeViewer.preservingSelection(TreeViewer.java:402)	at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1353)	at org.eclipse.jface.viewers.AbstractTreeViewer.inputChanged(AbstractTreeViewer.java:1467)	at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:274)	at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1634)	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.createPartControl(PackageExplorerPart.java:500)	at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:367)	at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:226)	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)	at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:529)	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)	at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:668)	at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:576)	at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:568)	at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:272)	at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:982)	at org.eclipse.ui.internal.WorkbenchPage.onActivate(WorkbenchPage.java:2626)	at org.eclipse.ui.internal.WorkbenchWindow$27.run(WorkbenchWindow.java:2965)	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)	at org.eclipse.ui.internal.WorkbenchWindow.setActivePage(WorkbenchWindow.java:2946)	at org.eclipse.ui.internal.WorkbenchWindow$21.runWithException(WorkbenchWindow.java:2263)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3855)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476)	at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)	at org.eclipse.ui.internal.Workbench$28.runWithException(Workbench.java:1384)	at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)	at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:134)	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3855)	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3476)	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2316)	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)	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:194)	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:368)	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:559)	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)	at org.eclipse.equinox.launcher.Main.run(Main.java:1311)	at org.eclipse.equinox.launcher.Main.main(Main.java:1287)