--- a/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/resources/mozilla_compat.js	Fri Nov 24 16:14:33 2017 +0000
+++ b/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/resources/mozilla_compat.js	Mon Nov 27 17:04:33 2017 +0530
@@ -45,7 +45,7 @@
 // importPackage
 // avoid unnecessary chaining of __noSuchProperty__ again
 // in case user loads this script more than once.
-if (typeof importPackage == 'undefined') {
+if (typeof importPackage == 'undefined' || !(importPackage instanceof Function)) {
 
 Object.defineProperty(this, "importPackage", {
     configurable: true, enumerable: false, writable: true,

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/nashorn/script/basic/JDK-8135178.js	Mon Nov 27 17:04:33 2017 +0530
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017, 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-8135178: importPackage not working even with load "Mozilla compatibility script"
+ *
+ * @test
+ * @run
+ */
+
+var ScriptContext = javax.script.ScriptContext;
+var manager = new javax.script.ScriptEngineManager();
+
+var engine1 = manager.getEngineByName("nashorn");
+engine1.eval("load('nashorn:mozilla_compat.js')");
+manager.setBindings(engine1.getBindings(ScriptContext.ENGINE_SCOPE));
+
+var engine2 = manager.getEngineByName("nashorn");
+engine2.eval("load('nashorn:mozilla_compat.js');");
+engine2.eval("importPackage(java.util);");
+
+engine2.eval("var al = new ArrayList()");
+Assert.assertTrue(engine2.eval("al instanceof java.util.ArrayList"));
+Assert.assertTrue(engine2.get("al") instanceof java.util.ArrayList);
+
+engine2.eval("var hm = new HashMap()");
+Assert.assertTrue(engine2.eval("hm instanceof java.util.HashMap"));
+Assert.assertTrue(engine2.get("hm") instanceof java.util.HashMap);