diff -r fd16c54261b3 -r 90ce3da70b43 jdk/test/java/util/AbstractMap/Equals.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/AbstractMap/Equals.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2001 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+import java.util.*;
+
+/**
+ * @test
+ * @bug     4503672
+ * @summary AbstractMap.equals and AbstractSet.equals are fragile: they
+ *          throw exceptions when they should return false.
+ * @author  Josh Bloch
+ */
+public class Equals {
+    public static void main(String[] args) {
+        Map m = new HashMap();
+        m.put(null, "");
+        Map h = new Hashtable();
+        h.put("", "");
+        if (m.equals(h))
+            throw new RuntimeException("1");
+
+        Map m1 = new TreeMap();
+        m1.put(new Integer(42), "The Answer");
+        Map m2 = new TreeMap();
+        m2.put("The Answer", new Integer(42));
+        if (m1.equals(m2))
+            throw new RuntimeException("3");
+
+        Set s1 = new TreeSet();
+        s1.add(new Integer(666));
+        Set s2 = new TreeSet();
+        s2.add("Great googly moogly!");
+        if (s1.equals(s2))
+            throw new RuntimeException("2");
+    }
+}