8234729: Javac should eagerly change code generation for method references to avert IllegalAccessError in future

Reviewed-by: mcimadamore

test/langtools/tools/javac/lambda/methodReference/ProtectedInaccessibleMethodRefTest2.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2019, 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 8234729
+ * @summary Javac should eagerly change code generation for method references to avert IllegalAccessError in future.
+ * @run main ProtectedInaccessibleMethodRefTest2
+ */
+
+import pack.I;
+import pack.J;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.function.Function;
+import java.lang.reflect.Method;
+import java.util.concurrent.Callable;
+
+public final class ProtectedInaccessibleMethodRefTest2 extends I {
+
+    public static void main(String... args) {
+        ProtectedInaccessibleMethodRefTest2 m = new ProtectedInaccessibleMethodRefTest2();
+        m.test(Paths.get("test"));
+        // Verify that the method reference has been folded into a lambda.
+        boolean lambdaFound = false;
+        for (Method meth : ProtectedInaccessibleMethodRefTest2.class.getDeclaredMethods()) {
+            if (meth.getName().equals("lambda$test$0")) {
+                lambdaFound = true;
+                break;
+            }
+        }
+        if (!lambdaFound) {
+            throw new AssertionError("Did not find evidence of new code generation");
+        }
+    }
+
+    void test(Path outputDir) {
+        Sub c = new Sub(this::readFile);
+        c.check(outputDir);
+    }
+    public class Sub extends J {
+        Sub(Function<Path,String> fileReader) {
+            super(fileReader);
+        }
+    }
+}