8138667: java.lang.IllegalAccessError: tried to access method (for a protected method)

Reviewed-by: mcimadamore

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

@@ -2256,6 +2256,12 @@ public class LambdaToMethod extends TreeTranslator {
                               types.erasure(owner.enclClass().asType()));
             }
 
+            boolean isProtectedInSuperClassOfEnclosingClassInOtherPackage() {
+                return ((tree.sym.flags() & PROTECTED) != 0 &&
+                        tree.sym.packge() != owner.packge() &&
+                        !owner.enclClass().isSubClass(tree.sym.owner, types));
+            }
+
             /**
              * Signature polymorphic methods need special handling.
              * e.g. MethodHandle.invoke() MethodHandle.invokeExact()
@@ -2293,6 +2299,7 @@ public class LambdaToMethod extends TreeTranslator {
                         needsVarArgsConversion() ||
                         isArrayOp() ||
                         isPrivateInOtherClass() ||
+                        isProtectedInSuperClassOfEnclosingClassInOtherPackage() ||
                         !receiverAccessible() ||
                         (tree.getMode() == ReferenceMode.NEW &&
                           tree.kind != ReferenceKind.ARRAY_CTOR &&

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

@@ -0,0 +1,71 @@
+/*
+ * 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 8138667
+ * @summary Verify that javac emits suitable accessors when a method reference mentions a protected method that would need an accessor
+ * @run main ProtectedInaccessibleMethodRefTest
+ */
+
+
+import pack.SuperClass;
+
+import java.util.concurrent.Callable;
+
+public final class ProtectedInaccessibleMethodRefTest extends SuperClass {
+
+    static String message = "NOT OK";
+
+    public void doTest() throws Exception {
+        new Callable<Void>() {
+            @Override
+            public Void call() throws Exception {
+                final Runnable r = ProtectedInaccessibleMethodRefTest.this::myDo;
+                r.run();
+                return null;
+            }
+        }.call();
+
+        new Callable<Void>() {
+            @Override
+            public Void call() throws Exception {
+                final Runnable r = ProtectedInaccessibleMethodRefTest::myStaticDo;
+                r.run();
+                return null;
+            }
+        }.call();
+    }
+
+    public void message(String s) {
+        message = s;
+    }
+
+    public static void main(String[] args) throws Exception {
+        new ProtectedInaccessibleMethodRefTest().doTest();
+        if (!message.equals("OK!"))
+            throw new AssertionError("Unexpected output");
+        if (!sMessage.equals("OK!"))
+            throw new AssertionError("Unexpected output");
+    }
+}

langtools/test/tools/javac/lambda/methodReference/pack/SuperClass.java

@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+
+package pack;
+
+public class SuperClass {
+
+    public static String sMessage = "Not OK";
+
+    protected final void myDo() {
+        message("OK!");
+    }
+
+    protected static final void myStaticDo() {
+        sMessage = "OK!";
+    }
+
+    public void message(String s) {
+    }
+}