--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/Bootstrap.java	Mon Aug 31 15:18:59 2015 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/Bootstrap.java	Tue Sep 01 18:28:11 2015 +0530
@@ -189,7 +189,7 @@
      * @return true if the obj is an instance of @FunctionalInterface interface
      */
     public static boolean isFunctionalInterfaceObject(final Object obj) {
-        return !JSType.isPrimitive(obj) && (NashornBeansLinker.getFunctionalInterfaceMethod(obj.getClass()) != null);
+        return !JSType.isPrimitive(obj) && (NashornBeansLinker.getFunctionalInterfaceMethodName(obj.getClass()) != null);
     }
 
     /**

--- a/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/NashornBeansLinker.java	Mon Aug 31 15:18:59 2015 +0200
+++ b/nashorn/src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/runtime/linker/NashornBeansLinker.java	Tue Sep 01 18:28:11 2015 +0530
@@ -79,10 +79,10 @@
     }
 
     // cache of @FunctionalInterface method of implementor classes
-    private static final ClassValue<Method> FUNCTIONAL_IFACE_METHOD = new ClassValue<Method>() {
+    private static final ClassValue<String> FUNCTIONAL_IFACE_METHOD_NAME = new ClassValue<String>() {
         @Override
-        protected Method computeValue(final Class<?> type) {
-            return findFunctionalInterfaceMethod(type);
+        protected String computeValue(final Class<?> type) {
+            return findFunctionalInterfaceMethodName(type);
         }
     };
 
@@ -107,19 +107,21 @@
             // annotated interface. This way Java method, constructor references or
             // implementations of java.util.function.* interfaces can be called as though
             // those are script functions.
-            final Method m = getFunctionalInterfaceMethod(self.getClass());
-            if (m != null) {
+            final String name = getFunctionalInterfaceMethodName(self.getClass());
+            if (name != null) {
                 final MethodType callType = desc.getMethodType();
-                // 'callee' and 'thiz' passed from script + actual arguments
-                if (callType.parameterCount() != m.getParameterCount() + 2) {
-                    throw typeError("no.method.matches.args", ScriptRuntime.safeToString(self));
-                }
-                return new GuardedInvocation(
-                        // drop 'thiz' passed from the script.
-                        MH.dropArguments(linkerServices.filterInternalObjects(desc.getLookup().unreflect(m)), 1,
-                                callType.parameterType(1)), Guards.getInstanceOfGuard(
-                                        m.getDeclaringClass())).asTypeSafeReturn(
-                                                new NashornBeansLinkerServices(linkerServices), callType);
+                // drop callee (Undefined ScriptFunction) and change the request to be dyn:callMethod:<name>
+                final NashornCallSiteDescriptor newDesc = NashornCallSiteDescriptor.get(desc.getLookup(),
+                        "dyn:callMethod:" + name, desc.getMethodType().dropParameterTypes(1, 2),
+                        NashornCallSiteDescriptor.getFlags(desc));
+                final GuardedInvocation gi = getGuardedInvocation(beansLinker,
+                        linkRequest.replaceArguments(newDesc, linkRequest.getArguments()),
+                        new NashornBeansLinkerServices(linkerServices));
+
+                // drop 'thiz' passed from the script.
+                return gi.replaceMethods(
+                    MH.dropArguments(linkerServices.filterInternalObjects(gi.getInvocation()), 1, callType.parameterType(1)),
+                    gi.getGuard());
             }
         }
         return getGuardedInvocation(beansLinker, linkRequest, linkerServices);
@@ -163,7 +165,7 @@
         return arg instanceof ConsString ? arg.toString() : arg;
     }
 
-    private static Method findFunctionalInterfaceMethod(final Class<?> clazz) {
+    private static String findFunctionalInterfaceMethodName(final Class<?> clazz) {
         if (clazz == null) {
             return null;
         }
@@ -179,20 +181,20 @@
                 // return the first abstract method
                 for (final Method m : iface.getMethods()) {
                     if (Modifier.isAbstract(m.getModifiers())) {
-                        return m;
+                        return m.getName();
                     }
                 }
             }
         }
 
         // did not find here, try super class
-        return findFunctionalInterfaceMethod(clazz.getSuperclass());
+        return findFunctionalInterfaceMethodName(clazz.getSuperclass());
     }
 
     // Returns @FunctionalInterface annotated interface's single abstract
-    // method. If not found, returns null.
-    static Method getFunctionalInterfaceMethod(final Class<?> clazz) {
-        return FUNCTIONAL_IFACE_METHOD.get(clazz);
+    // method name. If not found, returns null.
+    static String getFunctionalInterfaceMethodName(final Class<?> clazz) {
+        return FUNCTIONAL_IFACE_METHOD_NAME.get(clazz);
     }
 
     static MethodHandleTransformer createHiddenObjectFilter() {

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8068901.js	Tue Sep 01 18:28:11 2015 +0530
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2015, 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-8068901: Surprising behavior with more than one functional interface on a class
+ *
+ * @test
+ * @run
+ */
+
+var Consumer = java.util.function.Consumer;
+var JFunction = java.util.function.Function;
+
+var fc = new (Java.extend(JFunction, Consumer))({
+    apply: function(x) { print("fc invoked as a function") },
+    accept: function(x) { print("fc invoked as a consumer") }
+});
+
+var c = new Consumer(function(x) { print("c invoked as a consumer") });
+
+var cf = new (Java.extend(Consumer, JFunction))({
+    apply: function(x) { print("cf invoked as a function") },
+    accept: function(x) { print("cf invoked as a consumer") }
+});
+
+var f = new JFunction(function(x) { print("f invoked as a function") });
+
+for each(x in [fc, c, fc, cf, f, cf, c, fc, f, cf]) { x(null); }
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8068901.js.EXPECTED	Tue Sep 01 18:28:11 2015 +0530
@@ -0,0 +1,10 @@
+fc invoked as a function
+c invoked as a consumer
+fc invoked as a function
+cf invoked as a consumer
+f invoked as a function
+cf invoked as a consumer
+c invoked as a consumer
+fc invoked as a function
+f invoked as a function
+cf invoked as a consumer

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8068903.js	Tue Sep 01 18:28:11 2015 +0530
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2015, 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-8068903: Can't invoke vararg @FunctionalInterface methods
+ *
+ * @test
+ * @run
+ */
+
+var vc = new (Java.type("jdk.nashorn.test.models.VarArgConsumer"))(
+    function(x) {
+        Assert.assertTrue(x.length == 3);
+        Assert.assertTrue(x[0] == 1);
+        Assert.assertTrue(x[1] == 2);
+        Assert.assertTrue(x[2] == 3);
+    }
+);
+
+vc(1, 2, 3);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/src/jdk/nashorn/test/models/VarArgConsumer.java	Tue Sep 01 18:28:11 2015 +0530
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2015, 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.test.models;
+
+/**
+ * Simple function interface with a varargs SAM method.
+ */
+@FunctionalInterface
+public interface VarArgConsumer {
+    public void apply(Object... o);
+}
+