8141508: java.lang.invoke.LambdaConversionException: Invalid receiver type

Incorrect handling of intersection type parameter of functional interface descriptor results in call site initialization exception

Reviewed-by: mcimadamore

Author: Srikanth Adayapalam

langtools/src/share/classes/com/sun/tools/javac/comp/LambdaToMethod.java

@@ -2216,9 +2216,6 @@ final boolean isSignaturePolymorphic() {
              */
             boolean interfaceParameterIsIntersectionType() {
                 List<Type> tl = tree.getDescriptorType(types).getParameterTypes();
-                if (tree.kind == ReferenceKind.UNBOUND) {
-                    tl = tl.tail;
-                }
                 for (; tl.nonEmpty(); tl = tl.tail) {
                     Type pt = tl.head;
                     if (pt.getKind() == TypeKind.TYPEVAR) {

langtools/test/tools/javac/lambda/methodReference/IntersectionTypeReceiverTest.java

@@ -0,0 +1,64 @@
+/*
+ * 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.
+ */
+
+/**
+ * @test
+ * @bug 8141508
+ * @summary Test that Call site initialization exception is not thrown when the method
+   reference receiver is of intersection type.
+ * @run main IntersectionTypeReceiverTest
+ */
+
+import java.time.LocalDate;
+import java.util.EnumSet;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.function.Function;
+import java.util.function.Supplier;
+
+public class IntersectionTypeReceiverTest {
+
+    public static void main(String[] args) {
+        String output = valueOfKey(Size.class, LocalDate.now()).toString();
+        if (!"Optional[S]".equals(output))
+            throw new AssertionError("Unexpected output: " + output);
+    }
+
+    enum Size implements Supplier<LocalDate> {
+        S, M, L;
+
+        @Override
+        public LocalDate get() {
+            return LocalDate.now();
+        }
+
+    }
+
+    public static <K, T extends Enum<T> & Supplier<K>> Optional<T> valueOfKey(Class<T> enumType, K key) {
+        return valueOf(enumType, key, T::get);
+    }
+
+    public static <K, T extends Enum<T>> Optional<T> valueOf(Class<T> enumType, K key, Function<T, K> keyExtractor) {
+        return EnumSet.allOf(enumType).stream().filter(t -> Objects.equals(keyExtractor.apply(t), key)).findFirst();
+    }
+}