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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

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 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

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 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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 */

/*

 * @test

 * @bug 6505523

 * @summary NullPointerException in BasicTreeUI when a node is removed by expansion listener

 * @author Alexandr Scherbatiy

 * @run main bug6505523

 */

import java.awt.Point;

import java.awt.Rectangle;

import java.awt.Robot;

import java.awt.event.InputEvent;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTree;

import javax.swing.SwingUtilities;

import javax.swing.event.TreeExpansionEvent;

import javax.swing.event.TreeExpansionListener;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

import javax.swing.tree.TreeNode;

public class bug6505523 {

    private static JTree tree;

    public static void main(String[] args) throws Exception {

        Robot robot = new Robot();

        robot.setAutoDelay(50);

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                createAndShowGUI();

            }

        });

        Point point = getRowPointToClick(2);

        robot.mouseMove(point.x, point.y);

        robot.mousePress(InputEvent.BUTTON1_MASK);

        robot.mouseRelease(InputEvent.BUTTON1_MASK);

    }

    private static Point getRowPointToClick(final int row) throws Exception {

        final Point[] result = new Point[1];

        SwingUtilities.invokeAndWait(new Runnable() {

            @Override

            public void run() {

                Rectangle rect = tree.getRowBounds(row);

                Point point = new Point(rect.x - 5, rect.y + rect.height / 2);

                SwingUtilities.convertPointToScreen(point, tree);

                result[0] = point;

            }

        });

        return result[0];

    }

    private static void createAndShowGUI() {

        final DefaultMutableTreeNode root = new DefaultMutableTreeNode("Problem with NPE under JDK 1.6");

        final DefaultMutableTreeNode problematic = new DefaultMutableTreeNode("Expand me and behold a NPE in stderr");

        problematic.add(new DefaultMutableTreeNode("some content"));

        root.add(new DefaultMutableTreeNode("irrelevant..."));

        root.add(problematic);

        final DefaultTreeModel model = new DefaultTreeModel(root);

        tree = new JTree(model);

        tree.setRootVisible(true);

        tree.setShowsRootHandles(true);

        tree.expandRow(0);

        tree.collapseRow(2);

        // this is critical - without dragEnabled everything works

        tree.setDragEnabled(true);

        tree.addTreeExpansionListener(new TreeExpansionListener() {

            @Override

            public void treeExpanded(TreeExpansionEvent event) {

                TreeNode parent = problematic.getParent();

                if (parent instanceof DefaultMutableTreeNode) {

                    model.removeNodeFromParent(problematic);

                }

            }

            @Override

            public void treeCollapsed(TreeExpansionEvent event) {

            }

        });

        JFrame frame = new JFrame("JTree Problem");

        frame.add(new JScrollPane(tree));

        frame.setSize(500, 300);

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        frame.setLocationRelativeTo(null);

        frame.setVisible(true);

    }