--- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Types.java	Tue Aug 23 10:19:49 2016 +0100
+++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/code/Types.java	Wed Aug 24 12:23:10 2016 -0700
@@ -418,10 +418,15 @@
             final ListBuffer<Symbol> abstracts = new ListBuffer<>();
             for (Symbol sym : membersCache.getSymbols(new DescriptorFilter(origin))) {
                 Type mtype = memberType(origin.type, sym);
-                if (abstracts.isEmpty() ||
-                        (sym.name == abstracts.first().name &&
+                if (abstracts.isEmpty()) {
+                    abstracts.append(sym);
+                } else if ((sym.name == abstracts.first().name &&
                         overrideEquivalent(mtype, memberType(origin.type, abstracts.first())))) {
-                    abstracts.append(sym);
+                    if (!abstracts.stream().filter(msym -> msym.owner.isSubClass(sym.enclClass(), Types.this))
+                            .map(msym -> memberType(origin.type, msym))
+                            .anyMatch(abstractMType -> isSubSignature(abstractMType, mtype))) {
+                        abstracts.append(sym);
+                    }
                 } else {
                     //the target method(s) should be the only abstract members of t
                     throw failure("not.a.functional.intf.1",  origin,

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/test/tools/javac/T8047338/FilterNonMembersToObtainFunctionDescriptorTest.java	Wed Aug 24 12:23:10 2016 -0700
@@ -0,0 +1,55 @@
+/*
+ * 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.
+ *
+ * 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.
+ */
+
+/*
+ * @test
+ * @bug 8047338
+ * @summary javac is not correctly filtering non-members methods to obtain the function descriptor
+ * @compile FilterNonMembersToObtainFunctionDescriptorTest.java
+ */
+
+public class FilterNonMembersToObtainFunctionDescriptorTest {
+    <V, E extends Exception> V fails(CallableFail<V, E> callable) throws E {
+        return null;
+    }
+
+    <V, E extends Exception> V failsSub(CallableFailSub<V, E> callable) throws E {
+        return null;
+    }
+
+    void m() throws Exception {
+        fails((String s) -> 2);
+        failsSub((String s) -> 2);
+    }
+
+    interface Callable<V> {
+        V callFail(String s) throws Exception;
+    }
+
+    interface CallableFail<V, E extends Exception> extends Callable<V> {
+        @Override
+        V callFail(String s) throws E;
+    }
+
+    interface CallableFailSub<V, E extends Exception> extends CallableFail<V, E> {}
+}