--- a/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java	Thu Jul 18 18:08:26 2013 +0530
+++ b/nashorn/src/jdk/nashorn/internal/runtime/linker/JavaAdapterBytecodeGenerator.java	Thu Jul 18 16:22:25 2013 +0200
@@ -45,6 +45,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodType;
+import java.lang.reflect.AccessibleObject;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
@@ -66,6 +67,7 @@
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
+import sun.reflect.CallerSensitive;
 
 /**
  * Generates bytecode for a Java adapter class. Used by the {@link JavaAdapterFactory}.
@@ -378,7 +380,7 @@
         boolean gotCtor = false;
         for (final Constructor<?> ctor: superClass.getDeclaredConstructors()) {
             final int modifier = ctor.getModifiers();
-            if((modifier & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0) {
+            if((modifier & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0 && !isCallerSensitive(ctor)) {
                 generateConstructors(ctor);
                 gotCtor = true;
             }
@@ -843,7 +845,7 @@
                 }
                 if (Modifier.isPublic(m) || Modifier.isProtected(m)) {
                     final MethodInfo mi = new MethodInfo(typeMethod);
-                    if (Modifier.isFinal(m)) {
+                    if (Modifier.isFinal(m) || isCallerSensitive(typeMethod)) {
                         finalMethods.add(mi);
                     } else if (!finalMethods.contains(mi) && methodInfos.add(mi)) {
                         if (Modifier.isAbstract(m)) {
@@ -920,4 +922,8 @@
         final Class<?> superClass = c1.getSuperclass();
         return superClass.isAssignableFrom(c2) ? superClass : assignableSuperClass(superClass, c2);
     }
+
+    private static boolean isCallerSensitive(final AccessibleObject e) {
+        return e.getAnnotation(CallerSensitive.class) != null;
+    }
 }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/trusted/JDK-8020809.js	Thu Jul 18 16:22:25 2013 +0200
@@ -0,0 +1,47 @@
+/*
+ * 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-8020809: Java adapter should not allow overriding of caller sensitive methods
+ * 
+ * @test
+ * @run
+ */
+
+// This test runs as trusted as we need the
+// "enableContextClassLoaderOverride" runtime permission.
+
+var T = Java.extend(java.lang.Thread, {
+    getContextClassLoader: function() {
+        // Since getContextClassLoader is caller sensitive, this won't
+        // actually act as an override; it will be ignored. If we could
+        // invoke it, it would be an error.
+        throw new Error()
+    }
+})
+
+// Retrieve the context ClassLoader on our Thread adapter, ensure the
+// method was not, in fact, overridden.
+var cl = (new T()).contextClassLoader
+
+print("cl is class loader: "  + (cl instanceof java.lang.ClassLoader))

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/trusted/JDK-8020809.js.EXPECTED	Thu Jul 18 16:22:25 2013 +0200
@@ -0,0 +1,1 @@
+cl is class loader: true