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/*
* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @key headful
* @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();
}
});
robot.waitForIdle();
Point point = getRowPointToClick(2);
robot.mouseMove(point.x, point.y);
robot.mousePress(InputEvent.BUTTON1_MASK);
robot.mouseRelease(InputEvent.BUTTON1_MASK);
robot.waitForIdle();
}
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);
}
}
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