--- a/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/JSObjectLinker.java	Mon Feb 15 17:02:32 2016 +0100
+++ b/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/JSObjectLinker.java	Tue Feb 16 15:34:27 2016 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2010, 2016, 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
@@ -29,6 +29,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
 import java.util.Map;
 import javax.script.Bindings;
 import jdk.dynalink.CallSiteDescriptor;
@@ -135,12 +136,15 @@
     }
 
     private static GuardedInvocation findCallMethod(final CallSiteDescriptor desc) {
-        // TODO: if call site is already a vararg, don't do asCollector
         MethodHandle mh = JSOBJECT_CALL;
         if (NashornCallSiteDescriptor.isApplyToCall(desc)) {
             mh = MH.insertArguments(JSOBJECT_CALL_TO_APPLY, 0, JSOBJECT_CALL);
         }
-        return new GuardedInvocation(MH.asCollector(mh, Object[].class, desc.getMethodType().parameterCount() - 2), IS_JSOBJECT_GUARD);
+        final MethodType type = desc.getMethodType();
+        mh = type.parameterType(type.parameterCount() - 1) == Object[].class ?
+                mh :
+                MH.asCollector(mh, Object[].class, type.parameterCount() - 2);
+        return new GuardedInvocation(mh, IS_JSOBJECT_GUARD);
     }
 
     private static GuardedInvocation findNewMethod(final CallSiteDescriptor desc) {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/src/jdk/nashorn/api/scripting/test/JDK_8148140_Test.java	Tue Feb 16 15:34:27 2016 +0100
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+package jdk.nashorn.internal.runtime.test;
+
+import java.util.Arrays;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+import jdk.nashorn.api.scripting.AbstractJSObject;
+
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+import static org.testng.Assert.*;
+
+/**
+ * @bug 8148140
+ * @summary arguments are handled differently in apply for JS functions and AbstractJSObjects
+ */
+public class JDK_8148140_Test {
+
+    ScriptEngine engine;
+
+    static final String RESULT = "[1, 2, 3]";
+
+    @BeforeClass
+    public void setupTest() {
+        engine = new ScriptEngineManager().getEngineByName("js");
+        engine.put("f", new AbstractJSObject() {
+            @Override
+            public boolean isFunction() {
+                return true;
+            }
+            @Override
+            public Object call(Object thiz, Object... args) {
+                return Arrays.deepToString(args);
+            }
+        });
+    }
+
+    @Test
+    public void testCallF() throws ScriptException {
+        assertEquals(RESULT, engine.eval("f(1,2,3)"));
+    }
+
+    @Test
+    public void testApplyF() throws ScriptException {
+        assertEquals(RESULT, engine.eval("Function.prototype.apply.call(f, null, [1,2,3])"));
+    }
+
+}
\ No newline at end of file

--- a/test/src/jdk/nashorn/internal/runtime/test/JDK_8142924_Test.java	Mon Feb 15 17:02:32 2016 +0100
+++ b/test/src/jdk/nashorn/internal/runtime/test/JDK_8142924_Test.java	Tue Feb 16 15:34:27 2016 +0100
@@ -1,3 +1,27 @@
+/*
+ * Copyright (c) 2015, 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
 package jdk.nashorn.internal.runtime.test;
 
 import java.io.ByteArrayInputStream;