--- a/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeJava.java	Wed Sep 27 15:26:35 2017 +0200
+++ b/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/NativeJava.java	Wed Sep 27 17:09:52 2017 +0200
@@ -43,6 +43,7 @@
 import jdk.dynalink.linker.support.TypeUtilities;
 import jdk.nashorn.api.scripting.JSObject;
 import jdk.nashorn.api.scripting.ScriptObjectMirror;
+import jdk.nashorn.api.scripting.ScriptUtils;
 import jdk.nashorn.internal.objects.annotations.Attribute;
 import jdk.nashorn.internal.objects.annotations.Function;
 import jdk.nashorn.internal.objects.annotations.ScriptClass;
@@ -430,9 +431,9 @@
         if (objArray == null) {
             return null;
         } else if (objArray instanceof Collection) {
-            return new NativeArray(((Collection<?>)objArray).toArray());
+            return new NativeArray(ScriptUtils.unwrapArray(((Collection<?>)objArray).toArray()));
         } else if (objArray instanceof Object[]) {
-            return new NativeArray(((Object[])objArray).clone());
+            return new NativeArray(ScriptUtils.unwrapArray(((Object[])objArray).clone()));
         } else if (objArray instanceof int[]) {
             return new NativeArray(((int[])objArray).clone());
         } else if (objArray instanceof double[]) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/nashorn/script/basic/JDK-8186815.js	Wed Sep 27 17:09:52 2017 +0200
@@ -0,0 +1,44 @@
+/*
+ * 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-8186815: Java.from has a bug, when element is ScriptObject
+ *
+ * @test
+ * @run
+ */
+
+var list = new java.util.ArrayList();
+var obj = { x: 1 };
+list.add(obj);
+
+Assert.assertTrue(list.get(0) === obj);
+Assert.assertTrue(list.get(0) instanceof Object);
+
+var fromList = Java.from(list);
+Assert.assertTrue(fromList[0] === obj);
+Assert.assertTrue(fromList[0] instanceof Object);
+
+var fromArray = Java.from(list.toArray());
+Assert.assertTrue(fromArray[0] === obj);
+Assert.assertTrue(fromArray[0] instanceof Object);