--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/security/krb5/config/DnsFallback.java	Wed Feb 12 19:20:43 2014 +0800
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2008, 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
+ * @bug 6673164
+ * @bug 6552334
+ * @run main/othervm DnsFallback
+ * @summary fix dns_fallback parse error, and use dns by default
+ */
+
+import java.io.*;
+import java.lang.reflect.Method;
+import sun.security.krb5.Config;
+
+public class DnsFallback {
+
+    static Method useDNS_Realm;
+
+    public static void main(String[] args) throws Exception {
+
+        useDNS_Realm = Config.class.getDeclaredMethod("useDNS_Realm");
+        useDNS_Realm.setAccessible(true);
+
+
+        // for 6673164
+        check("true", "true", true);
+        check("false", "true", false);
+        check("true", "false", true);
+        check("false", "false", false);
+        check("true", null, true);
+        check("false", null, false);
+        check(null, "true", true);
+        check(null, "false", false);
+
+        // for 6552334
+        check(null, null, true);
+    }
+
+    static void check(String realm, String fallback, boolean output)
+            throws Exception {
+
+        try (PrintStream ps =
+                new PrintStream(new FileOutputStream("dnsfallback.conf"))) {
+            ps.println("[libdefaults]\n");
+            if (realm != null) {
+                ps.println("dns_lookup_realm=" + realm);
+            }
+            if (fallback != null) {
+                ps.println("dns_fallback=" + fallback);
+            }
+        }
+
+        System.setProperty("java.security.krb5.conf", "dnsfallback.conf");
+        Config.refresh();
+        System.out.println("Testing " + realm + ", " + fallback + ", " + output);
+
+        if (!useDNS_Realm.invoke(Config.getInstance()).equals(output)) {
+            throw new Exception("Fail");
+        }
+    }
+}
+