--- a/nashorn/src/jdk/nashorn/internal/objects/NativeString.java	Tue Oct 22 11:31:03 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeString.java	Tue Oct 22 17:38:12 2013 +0530
@@ -505,7 +505,7 @@
      */
     @Function(attributes = Attribute.NOT_ENUMERABLE)
     public static Object charAt(final Object self, final Object pos) {
-        return charAt(self, JSType.toInteger(pos));
+        return charAtImpl(checkObjectToString(self), JSType.toInteger(pos));
     }
 
     /**
@@ -527,7 +527,10 @@
      */
     @SpecializedFunction
     public static String charAt(final Object self, final int pos) {
-        final String str = checkObjectToString(self);
+        return charAtImpl(checkObjectToString(self), pos);
+    }
+
+    private static String charAtImpl(final String str, final int pos) {
         return (pos < 0 || pos >= str.length()) ? "" : String.valueOf(str.charAt(pos));
     }
 
@@ -539,7 +542,7 @@
      */
     @Function(attributes = Attribute.NOT_ENUMERABLE)
     public static Object charCodeAt(final Object self, final Object pos) {
-        return charCodeAt(self, JSType.toInteger(pos));
+        return charCodeAtImpl(checkObjectToString(self), JSType.toInteger(pos));
     }
 
     /**
@@ -561,7 +564,10 @@
      */
     @SpecializedFunction
     public static double charCodeAt(final Object self, final int pos) {
-        final String str = checkObjectToString(self);
+        return charCodeAtImpl(checkObjectToString(self), pos);
+    }
+
+    private static double charCodeAtImpl(final String str, final int pos) {
         return (pos < 0 || pos >= str.length()) ? Double.NaN :  str.charAt(pos);
     }
 

--- a/nashorn/src/overview.html	Tue Oct 22 11:31:03 2013 +0200
+++ b/nashorn/src/overview.html	Tue Oct 22 17:38:12 2013 +0530
@@ -108,6 +108,6 @@
 <h2>Other non-standard built-in objects</h2>
 In addition to {@code Java}, Nashorn also exposes some other non-standard built-in objects:
 <a href="jdk/nashorn/internal/objects/NativeJSAdapter.html">{@code JSAdapter}</a>,
-<a href="jdk/nashorn/internal/objects/NativeJavaImporter.html">{@code JavaImporter},
+<a href="jdk/nashorn/internal/objects/NativeJavaImporter.html">{@code JavaImporter}</a>,
 <a href="jdk/nashorn/internal/runtime/NativeJavaPackage.html">{@code Packages}.</a>
 </body>

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8027024.js	Tue Oct 22 17:38:12 2013 +0530
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2010, 2013, 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.
+ */
+
+/**
+ * JDK-8027024: String.prototype.charAt and charCodeAt do not evaluate 'self' and 'pos' arguments in right order 
+ *
+ * @test
+ * @run
+ */
+
+
+String.prototype.charAt.call(
+    {
+        toString: function() {
+            print("charAt.self.toString");
+        }
+    },
+
+    {
+        valueOf: function() {
+            print("charAt.pos.valueOf");
+        }
+    }
+);
+
+String.prototype.charCodeAt.call(
+    {
+        toString: function() {
+            print("charCodeAt.self.toString");
+        }
+    },
+
+    {
+        valueOf: function() {
+            print("charCodeAt.pos.valueOf");
+        }
+    }
+);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8027024.js.EXPECTED	Tue Oct 22 17:38:12 2013 +0530
@@ -0,0 +1,4 @@
+charAt.self.toString
+charAt.pos.valueOf
+charCodeAt.self.toString
+charCodeAt.pos.valueOf