--- a/src/share/classes/java/util/EnumSet.java	Tue Aug 19 16:05:26 2008 -0700
+++ b/src/share/classes/java/util/EnumSet.java	Wed Aug 20 13:45:12 2008 -0700
@@ -432,4 +432,11 @@
     Object writeReplace() {
         return new SerializationProxy<E>(this);
     }
+
+    // readObject method for the serialization proxy pattern
+    // See Effective Java, Second Ed., Item 78.
+    private void readObject(java.io.ObjectInputStream stream)
+        throws java.io.InvalidObjectException {
+        throw new java.io.InvalidObjectException("Proxy required");
+    }
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/java/util/EnumSet/BogusEnumSet.java	Wed Aug 20 13:45:12 2008 -0700
@@ -0,0 +1,93 @@
+/*
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug     6739302
+ * @summary Check that deserialization preserves EnumSet integrity
+ * @author  Josh Bloch
+ */
+
+import java.util.*;
+import java.io.*;
+
+public class BogusEnumSet {
+    public static void main(String[] args) throws Throwable {
+        byte[] serializedForm  = {
+            (byte)0xac, (byte)0xed, 0x0, 0x5, 0x73, 0x72, 0x0, 0x18,
+            0x6a,  0x61,  0x76,  0x61, 0x2e,  0x75,  0x74,  0x69,
+            0x6c,  0x2e, 0x52, 0x65, 0x67, 0x75, 0x6c, 0x61, 0x72, 0x45,
+            0x6e, 0x75, 0x6d, 0x53, 0x65, 0x74, 0x2f, 0x58, 0x6f, (byte)0xc7,
+            0x7e, (byte)0xb0, (byte)0xd0, 0x7e, 0x2, 0x0, 0x1, 0x4a, 0x0, 0x8,
+            0x65, 0x6c, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x73, 0x78, 0x72, 0x0,
+            0x11, 0x6a,  0x61,  0x76,  0x61, 0x2e,  0x75,  0x74,  0x69,
+            0x6c,  0x2e, 0x45, 0x6e, 0x75, 0x6d, 0x53, 0x65, 0x74, 0xe,
+            0x3, 0x21, 0x6a, (byte)0xcd, (byte)0x8c, 0x29, (byte)0xdd, 0x2,
+            0x0, 0x2, 0x4c, 0x0, 0xb, 0x65, 0x6c, 0x65, 0x6d, 0x65, 0x6e, 0x74,
+            0x54, 0x79, 0x70, 0x65, 0x74, 0x0, 0x11, 0x4c, 0x6a, 0x61, 0x76,
+            0x61, 0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x43, 0x6c, 0x61, 0x73,
+            0x73, 0x3b, 0x5b, 0x0, 0x8, 0x75, 0x6e, 0x69, 0x76, 0x65, 0x72,
+            0x73, 0x65, 0x74, 0x0, 0x11, 0x5b, 0x4c, 0x6a, 0x61, 0x76, 0x61,
+            0x2f, 0x6c, 0x61, 0x6e, 0x67, 0x2f, 0x45, 0x6e, 0x75, 0x6d, 0x3b,
+            0x78, 0x70, 0x76, 0x72, 0x0, 0x16, 0x6a, 0x61, 0x76, 0x61, 0x2e,
+            0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x54, 0x68, 0x72, 0x65, 0x61,
+            0x64, 0x24, 0x53, 0x74, 0x61, 0x74, 0x65, 0x0, 0x0, 0x0, 0x0, 0x0,
+            0x0, 0x0, 0x0, 0x12, 0x0, 0x0, 0x78, 0x72, 0x0, 0xe, 0x6a, 0x61,
+            0x76, 0x61, 0x2e, 0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x45, 0x6e, 0x75,
+            0x6d, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x12, 0x0, 0x0, 0x78,
+            0x70, 0x75, 0x72, 0x0, 0x19, 0x5b, 0x4c, 0x6a, 0x61, 0x76, 0x61,
+            0x2e, 0x6c, 0x61, 0x6e, 0x67, 0x2e, 0x54, 0x68, 0x72, 0x65, 0x61,
+            0x64, 0x24, 0x53, 0x74, 0x61, 0x74, 0x65, 0x3b, 0x68, (byte)0xa3,
+            (byte)0xb5, (byte)0xd5, 0x11, 0x7d, 0x1b, (byte)0xb3, 0x2, 0x0,
+            0x0, 0x78, 0x70, 0x0, 0x0, 0x0, 0x6, 0x7e, 0x71, 0x0, 0x7e, 0x0,
+            0x5, 0x74, 0x0, 0x3, 0x4e, 0x45, 0x57, 0x7e, 0x71, 0x0, 0x7e, 0x0,
+            0x5, 0x74, 0x0, 0x8, 0x52, 0x55, 0x4e, 0x4e, 0x41, 0x42, 0x4c, 0x45,
+            0x7e, 0x71, 0x0, 0x7e, 0x0, 0x5, 0x74, 0x0, 0x7, 0x42, 0x4c, 0x4f,
+            0x43, 0x4b, 0x45, 0x44, 0x7e, 0x71, 0x0, 0x7e, 0x0, 0x5, 0x74, 0x0,
+            0x7, 0x57, 0x41, 0x49, 0x54, 0x49, 0x4e, 0x47, 0x7e, 0x71, 0x0,
+            0x7e, 0x0, 0x5, 0x74, 0x0, 0xd, 0x54, 0x49, 0x4d, 0x45, 0x44,
+            0x5f, 0x57, 0x41, 0x49, 0x54, 0x49, 0x4e, 0x47, 0x7e, 0x71, 0x0,
+            0x7e, 0x0, 0x5, 0x74, 0x0, 0xa, 0x54, 0x45, 0x52, 0x4d, 0x49,
+            0x4e, 0x41, 0x54, 0x45, 0x44, (byte)0xff, (byte)0xff, (byte)0xff,
+            (byte)0xff, (byte)0xff, (byte)0xff, (byte)0xff, (byte)0xff
+        };
+
+        try {
+          // Should fail, but instead creates corrupt EnumSet
+          @SuppressWarnings("unchecked")
+          EnumSet<Thread.State> es = (EnumSet<Thread.State>)
+              deserialize(serializedForm);
+
+          // Demonstrates corruption
+          System.out.println("Enum size: " + Thread.State.values().length); // 6
+          System.out.println("Set size: " + es.size()); // 64
+          System.out.println("Set: " + es); // Throws IndexOutOfBoundsException
+          throw new AssertionError("Expected exception InvalidObjectException not thrown");
+        } catch (java.io.InvalidObjectException _) { /* OK */ }
+    }
+
+    private static Object deserialize(byte[] sf) throws Throwable {
+      return new ObjectInputStream(
+          new ByteArrayInputStream(sf))
+          .readObject();
+    }
+}