8025001: setFocusTraversalPolicy() to ContainerOrderFocusTraversalPolicy results in an infinite loop

Reviewed-by: ssadetsky, psadhukhan

jdk/src/java.desktop/share/classes/java/awt/ContainerOrderFocusTraversalPolicy.java

@@ -231,7 +231,9 @@ public class ContainerOrderFocusTraversalPolicy extends FocusTraversalPolicy
             // Before all the checks below we first see if it's an FTP provider or a focus cycle root.
             // If it's the case just go down cycle (if it's set to "implicit").
             Component comp = getComponentDownCycle(aComponent, FORWARD_TRAVERSAL);
-            if (comp != null) {
+            // Check if aComponent is focus-cycle-root's default Component, i.e.
+            // focus cycle root & focus-cycle-root's default Component is same.
+            if (comp != null && comp != aComponent) {
                 return comp;
             }
 

jdk/test/java/awt/Focus/FocusTraversalPolicy/ContainerOrderFTPTest.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2016, 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 8025001
+  @summary Tests java.awt.ContainerOrderFocusTraversalPolicy functionality.
+  @run main ContainerOrderFTPTest
+*/
+
+import java.awt.Frame;
+import java.awt.Button;
+import java.awt.Component;
+import java.awt.FlowLayout;
+import java.awt.ContainerOrderFocusTraversalPolicy;
+
+public class ContainerOrderFTPTest {
+
+    private final ContainerOrderFocusTraversalPolicy coftp;
+    private final Frame frame;
+    private final Button b1;
+    private final Button b2;
+    private final String expectedTraversal;
+
+    public ContainerOrderFTPTest() {
+        expectedTraversal = "B1B2F1";
+        b1 = new Button("B1");
+        b2 = new Button("B2");
+        frame = new Frame("F1");
+
+        frame.setLayout(new FlowLayout());
+        frame.setSize(200, 200);
+        coftp = new ContainerOrderFocusTraversalPolicy();
+        frame.setFocusTraversalPolicy(coftp);
+        frame.add(b1);
+        frame.add(b2);
+        frame.setVisible(true);
+    }
+
+    public static void main(String[] args) throws Exception {
+        ContainerOrderFTPTest test = new ContainerOrderFTPTest();
+        test.performTest();
+        test.dispose();
+    }
+
+    public void performTest() {
+        int count = 0;
+        Component comp = coftp.getFirstComponent(frame);
+        String traversal = "";
+        do {
+            comp = coftp.getComponentAfter(frame, comp);
+            if (comp instanceof Button) {
+                traversal += ((Button)comp).getLabel();
+            } else if (comp instanceof Frame) {
+                traversal += ((Frame)comp).getTitle();
+            }
+            count++;
+        } while(count < 3);
+
+        if (!expectedTraversal.equals(traversal)) {
+            dispose();
+            throw new RuntimeException("Incorrect Traversal. Expected : "
+                + expectedTraversal + "Actual : " + traversal);
+        }
+    }
+
+    public void dispose() {
+        frame.dispose();
+    }
+}