--- a/nashorn/src/jdk/nashorn/internal/objects/NativeError.java	Wed Jun 04 14:32:23 2014 +0200
+++ b/nashorn/src/jdk/nashorn/internal/objects/NativeError.java	Wed Jun 04 19:01:24 2014 +0530
@@ -316,7 +316,12 @@
         final Object exception = ECMAException.getException(sobj);
         if (exception instanceof Throwable) {
             final Object value = getScriptStackString(sobj, (Throwable)exception);
-            sobj.put(STACK, value, false);
+            if (sobj.hasOwnProperty(STACK)) {
+                sobj.put(STACK, value, false);
+            } else {
+                sobj.addOwnProperty(STACK, Attribute.NOT_ENUMERABLE, value);
+            }
+
             return value;
         }
 
@@ -334,7 +339,11 @@
      */
     public static Object setStack(final Object self, final Object value) {
         final ScriptObject sobj = Global.checkObject(self);
-        sobj.set(STACK, value, false);
+        if (sobj.hasOwnProperty(STACK)) {
+            sobj.put(STACK, value, false);
+        } else {
+            sobj.addOwnProperty(STACK, Attribute.NOT_ENUMERABLE, value);
+        }
         return value;
     }
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8044695.js	Wed Jun 04 19:01:24 2014 +0530
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2014, 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-8044695: __stack__ becomes visible in Error properties
+ *
+ * @test
+ * @run
+ */
+
+var e = new Error();
+// access stack to force __stack__
+e.stack;
+var jsonStr = JSON.stringify(e);
+if (jsonStr != "{}") {
+    fail("JSON string is not {}, it is " + jsonStr);
+}