From d4881082ff1395ab9d04509546607ddc2f338f5a Mon Sep 17 00:00:00 2001
From: sherman <unknown>
Date: Fri, 2 Dec 2011 16:25:35 -0800
Subject: [PATCH] 5035850: (str) String.CASE_INSENSITIVE_ORDER should override
 readResolve() Summary: Fix to ensure singleton property of
 String.CaseInsensitiveComparator is maintained through de/serialization.
 Reviewed-by: alanb, forax, smarks, dholmes Contributed-by:
 darryl.mocek@oracle.com

---
 src/share/classes/java/lang/String.java       |  3 +
 .../String/CaseInsensitiveComparator.java     | 68 +++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 test/java/lang/String/CaseInsensitiveComparator.java

diff --git a/src/share/classes/java/lang/String.java b/src/share/classes/java/lang/String.java
index 1a40916a2..50b3f7b6b 100644
--- a/src/share/classes/java/lang/String.java
+++ b/src/share/classes/java/lang/String.java
@@ -1245,6 +1245,9 @@ public final class String
             }
             return n1 - n2;
         }
+
+        /** Replaces the de-serialized object. */
+        private Object readResolve() { return CASE_INSENSITIVE_ORDER; }
     }
 
     /**
diff --git a/test/java/lang/String/CaseInsensitiveComparator.java b/test/java/lang/String/CaseInsensitiveComparator.java
new file mode 100644
index 000000000..039393215
--- /dev/null
+++ b/test/java/lang/String/CaseInsensitiveComparator.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2011, 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.
+ */
+
+/*
+ * This test tests that the String.CaseInsensitiveComparator.readResolve method
+ * deserializes String.CASE_INSENSITIVE_ORDER into an object which satisfies the
+ * equals method.
+ *
+ * @test
+ * @bug 5035850
+ * @summary Test for String.CaseInsensitiveComparator.readResolve
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+public class CaseInsensitiveComparator {
+    public static void main(String[] args) throws Exception {
+        Object result;
+
+        try (ByteArrayOutputStream outBuffer = new ByteArrayOutputStream();
+                ObjectOutputStream out = new ObjectOutputStream(outBuffer))
+        {
+            out.writeObject(String.CASE_INSENSITIVE_ORDER);
+            out.close();
+
+            try (ByteArrayInputStream inBuffer = new ByteArrayInputStream(outBuffer.toByteArray());
+                    ObjectInputStream in = new ObjectInputStream(inBuffer))
+            {
+                result = in.readObject();
+            }
+        }
+
+        if (!String.CASE_INSENSITIVE_ORDER.equals(result)) {
+            throw new Exception("Value restored from serial form does not equal original!");
+        }
+
+        if (!result.equals(String.CASE_INSENSITIVE_ORDER)) {
+            throw new Exception("Value restored from serial form does not equal original!");
+        }
+
+        if (String.CASE_INSENSITIVE_ORDER != result) {
+            throw new Exception("Value restored from serial form does not equal original!");
+        }
+    }
+}
-- 
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