java.lang.NullPointerException
	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(BasicTreeUI.java:1855)
	at javax.swing.plaf.basic.BasicTreeUI.completeEditing(BasicTreeUI.java:1820)
	at javax.swing.plaf.basic.BasicTreeUI$TreeSelectionHandler.valueChanged(BasicTreeUI.java:2418)
	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:612)
	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1006)
	at javax.swing.tree.DefaultTreeSelectionModel.removeSelectionPaths(DefaultTreeSelectionModel.java:498)
	at javax.swing.JTree.removeDescendantSelectedPaths(JTree.java:2879)
	at javax.swing.JTree.removeDescendantSelectedPaths(JTree.java:2929)
	at javax.swing.JTree$TreeModelHandler.treeNodesRemoved(JTree.java:3012)
	at javax.swing.tree.DefaultTreeModel.fireTreeNodesRemoved(DefaultTreeModel.java:492)
	at javax.swing.tree.DefaultTreeModel.nodesWereRemoved(DefaultTreeModel.java:303)
	at javax.swing.tree.DefaultTreeModel.removeNodeFromParent(DefaultTreeModel.java:239)

 private  TreeStateNode getNodeForPath(TreePath path, boolean  onlyIfVisible, boolean  shouldCreate) {
	 if (path !=  null ) {
	    TreeStateNode      node;
	    node = getMapping(path);
	     if (node !=  null ) {
		 if (onlyIfVisible && !node.isVisible())
		     return   null ;
		 return  node;
	    }
	    // Check all the parent paths, until a match is found.
	    Stack                paths;
	     if (tempStacks.size() ==  0 ) {
		paths =  new  Stack();
	    }
	     else  {
		paths = (Stack)tempStacks.pop();
	    }
	     try  {
		paths.push(path);
		path = path.getParentPath();
		node =  null ;
		 while (path !=  null ) {
		    node = getMapping(path);
		     if (node !=  null ) {
			// Found a match, create entries for all paths in
			// paths.
			 while (node !=  null  && paths.size() >  0 ) {
			    path = (TreePath)paths.pop();
			    node.getLoadedChildren(shouldCreate);
 
			     int             childIndex = treeModel.
				      getIndexOfChild(node.getUserObject(),
						  path.getLastPathComponent());
 
			    // Это условие возвращает true
 
			     if (childIndex == - 1  ||
			       childIndex >= node.getChildCount() ||
			       (onlyIfVisible && !node.isVisible())) {
				node =  null ;
			    }
			     else 
				node = (TreeStateNode)node.getChildAt
				               (childIndex);
			}
			 return  node;
		    }
		    paths.push(path);
		    path = path.getParentPath();
		}
	    }
	     finally  {
		paths.removeAllElements();
		tempStacks.push(paths);
	    }
	    // If we get here it means they share a different root!
	    // We could throw an exception...
	}
	 return   null ;
    }