1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @key headful 27 * @bug 6505523 28 * @summary NullPointerException in BasicTreeUI when a node is removed by expansion listener 29 * @author Alexandr Scherbatiy 30 * @run main bug6505523 31 */ 32 import java.awt.Point; 33 import java.awt.Rectangle; 34 import java.awt.Robot; 35 import java.awt.event.InputEvent; 36 import javax.swing.JFrame; 37 import javax.swing.JScrollPane; 38 import javax.swing.JTree; 39 import javax.swing.SwingUtilities; 40 import javax.swing.event.TreeExpansionEvent; 41 import javax.swing.event.TreeExpansionListener; 42 import javax.swing.tree.DefaultMutableTreeNode; 43 import javax.swing.tree.DefaultTreeModel; 44 import javax.swing.tree.TreeNode; 45 46 public class bug6505523 { 47 48 private static JTree tree; 49 main(String[] args)50 public static void main(String[] args) throws Exception { 51 Robot robot = new Robot(); 52 robot.setAutoDelay(50); 53 54 SwingUtilities.invokeAndWait(new Runnable() { 55 56 @Override 57 public void run() { 58 createAndShowGUI(); 59 } 60 }); 61 62 robot.waitForIdle(); 63 64 Point point = getRowPointToClick(2); 65 robot.mouseMove(point.x, point.y); 66 robot.mousePress(InputEvent.BUTTON1_MASK); 67 robot.mouseRelease(InputEvent.BUTTON1_MASK); 68 69 robot.waitForIdle(); 70 71 } 72 getRowPointToClick(final int row)73 private static Point getRowPointToClick(final int row) throws Exception { 74 75 final Point[] result = new Point[1]; 76 77 SwingUtilities.invokeAndWait(new Runnable() { 78 79 @Override 80 public void run() { 81 Rectangle rect = tree.getRowBounds(row); 82 Point point = new Point(rect.x - 5, rect.y + rect.height / 2); 83 SwingUtilities.convertPointToScreen(point, tree); 84 result[0] = point; 85 } 86 }); 87 88 return result[0]; 89 } 90 createAndShowGUI()91 private static void createAndShowGUI() { 92 final DefaultMutableTreeNode root = new DefaultMutableTreeNode("Problem with NPE under JDK 1.6"); 93 final DefaultMutableTreeNode problematic = new DefaultMutableTreeNode("Expand me and behold a NPE in stderr"); 94 problematic.add(new DefaultMutableTreeNode("some content")); 95 root.add(new DefaultMutableTreeNode("irrelevant...")); 96 root.add(problematic); 97 98 final DefaultTreeModel model = new DefaultTreeModel(root); 99 tree = new JTree(model); 100 tree.setRootVisible(true); 101 tree.setShowsRootHandles(true); 102 tree.expandRow(0); 103 tree.collapseRow(2); 104 105 // this is critical - without dragEnabled everything works 106 tree.setDragEnabled(true); 107 108 tree.addTreeExpansionListener(new TreeExpansionListener() { 109 110 @Override 111 public void treeExpanded(TreeExpansionEvent event) { 112 TreeNode parent = problematic.getParent(); 113 if (parent instanceof DefaultMutableTreeNode) { 114 model.removeNodeFromParent(problematic); 115 } 116 } 117 118 @Override 119 public void treeCollapsed(TreeExpansionEvent event) { 120 } 121 }); 122 123 JFrame frame = new JFrame("JTree Problem"); 124 frame.add(new JScrollPane(tree)); 125 frame.setSize(500, 300); 126 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 127 frame.setLocationRelativeTo(null); 128 frame.setVisible(true); 129 } 130 } 131