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java.lang.NullPointerException at org.springframework.ide.eclipse.webflow.ui.navigator.WebflowNavigatorContentProvider.hasChildren(WebflowNavigatorContentProvider.java:117) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.hasChildren(SafeDelegateTreeContentProvider.java:107) at org.eclipse.ui.internal.navigator.extensions.SafeDelegateTreeContentProvider.hasChildren(SafeDelegateTreeContentProvider.java:292) at org.eclipse.ui.internal.navigator.NavigatorContentServiceContentProvider.hasChildren(NavigatorContentServiceContentProvider.java:654) at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:1976) at org.eclipse.jface.viewers.TreeViewer.isExpandable(TreeViewer.java:449) at org.eclipse.jface.viewers.AbstractTreeViewer.isExpandable(AbstractTreeViewer.java:2006) at org.eclipse.jface.viewers.AbstractTreeViewer.updatePlus(AbstractTreeViewer.java:2619) at org.eclipse.jface.viewers.TreeViewer.updatePlus(TreeViewer.java:693) at org.eclipse.jface.viewers.AbstractTreeViewer.updateChildren(AbstractTreeViewer.java:2554) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1788) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:561) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefreshStruct(AbstractTreeViewer.java:1795) at org.eclipse.jface.viewers.TreeViewer.internalRefreshStruct(TreeViewer.java:561) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1763) at org.eclipse.jface.viewers.AbstractTreeViewer.internalRefresh(AbstractTreeViewer.java:1719) at org.eclipse.ui.navigator.CommonViewer.internalRefresh(CommonViewer.java:454)