8015926: NPE when using SynthTreeUI's expandPath()

Reviewed-by: alexsch

src/share/classes/javax/swing/plaf/synth/SynthTreeUI.java

@@ -344,7 +344,8 @@ public class SynthTreeUI extends BasicTreeUI
             configureRenderer(cellContext);
             while (!done && paintingEnumerator.hasMoreElements()) {
                 path = (TreePath)paintingEnumerator.nextElement();
-                if (path != null) {
+                bounds = getPathBounds(tree, path);
+                if ((path != null) && (bounds != null)) {
                     isLeaf = treeModel.isLeaf(path.getLastPathComponent());
                     if (isLeaf) {
                         isExpanded = hasBeenExpanded = false;
@@ -353,7 +354,6 @@ public class SynthTreeUI extends BasicTreeUI
                         isExpanded = treeState.getExpandedState(path);
                         hasBeenExpanded = tree.hasBeenExpanded(path);
                     }
-                    bounds = getPathBounds(tree, path);
                     rowBounds.y = bounds.y;
                     rowBounds.height = bounds.height;
                     paintRow(renderer, dtcr, context, cellContext, g,
@@ -383,7 +383,8 @@ public class SynthTreeUI extends BasicTreeUI
             paintingEnumerator = treeState.getVisiblePathsFrom(initialPath);
             while (!done && paintingEnumerator.hasMoreElements()) {
                 path = (TreePath)paintingEnumerator.nextElement();
-                if (path != null) {
+                bounds = getPathBounds(tree, path);
+                if ((path != null) && (bounds != null)) {
                     isLeaf = treeModel.isLeaf(path.getLastPathComponent());
                     if (isLeaf) {
                         isExpanded = hasBeenExpanded = false;
@@ -392,7 +393,6 @@ public class SynthTreeUI extends BasicTreeUI
                         isExpanded = treeState.getExpandedState(path);
                         hasBeenExpanded = tree.hasBeenExpanded(path);
                     }
-                    bounds = getPathBounds(tree, path);
                     // See if the vertical line to the parent has been drawn.
                     parentPath = path.getParentPath();
                     if (parentPath != null) {

test/javax/swing/plaf/synth/Test8015926.java

+/*
+ * Copyright (c) 2013, 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
+ * @bug 8015926
+ * @summary Tests that there are no NPE during painting
+ * @author Sergey Malenkov
+ */
+
+import javax.swing.JFrame;
+import javax.swing.JTree;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.event.TreeModelEvent;
+import javax.swing.event.TreeModelListener;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeModel;
+
+import static javax.swing.WindowConstants.DISPOSE_ON_CLOSE;
+
+public class Test8015926 implements TreeModelListener, Runnable, Thread.UncaughtExceptionHandler {
+
+    public static void main(String[] args) throws Exception {
+        UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
+        SwingUtilities.invokeAndWait(new Test8015926());
+        Thread.sleep(1000L);
+    }
+
+    private JTree tree;
+
+    @Override
+    public void treeStructureChanged(TreeModelEvent event) {
+    }
+
+    @Override
+    public void treeNodesRemoved(TreeModelEvent event) {
+    }
+
+    @Override
+    public void treeNodesInserted(TreeModelEvent event) {
+        this.tree.expandPath(event.getTreePath());
+    }
+
+    @Override
+    public void treeNodesChanged(TreeModelEvent event) {
+    }
+
+    @Override
+    public void run() {
+        Thread.currentThread().setUncaughtExceptionHandler(this);
+
+        DefaultMutableTreeNode root = new DefaultMutableTreeNode();
+        DefaultMutableTreeNode child = new DefaultMutableTreeNode("Child");
+        DefaultTreeModel model = new DefaultTreeModel(root);
+
+        this.tree = new JTree();
+        this.tree.setModel(model);
+
+        JFrame frame = new JFrame(getClass().getSimpleName());
+        frame.add(this.tree);
+
+        model.addTreeModelListener(this); // frame is not visible yet
+        model.insertNodeInto(child, root, root.getChildCount());
+        model.removeNodeFromParent(child);
+
+        frame.setSize(640, 480);
+        frame.setLocationRelativeTo(null);
+        frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+        frame.setVisible(true);
+    }
+
+    @Override
+    public void uncaughtException(Thread thread, Throwable exception) {
+        exception.printStackTrace();
+        System.exit(1);
+    }
+}