--- /dev/null 2019-10-08 18:54:17.000000000 -0700 +++ new/test/jdk/java/lang/invoke/nestmates/src/p/F.java 2019-10-08 18:54:16.000000000 -0700 @@ -0,0 +1,74 @@ +/* + * 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. + */ + +package p; + +import java.lang.invoke.MethodHandle; +import java.lang.invoke.MethodHandles; +import java.lang.invoke.MethodHandles.Lookup; + +import static java.lang.invoke.MethodType.methodType; + +public class F extends ThreadLocal { + private String name() { + return "F"; + } + + public static class Inner { + public static void test() throws Throwable { + // Inner is a nestmate of F + assertTrue(Inner.class.isNestmateOf(F.class)); + + F f = new F(); + // Inner is a nestmate of F and this lookup can find private member of F + Lookup lookup = MethodHandles.lookup(); + MethodHandle mh1 = lookup.findVirtual(F.class, "name", methodType(String.class)); + String n = (String)mh1.invokeExact(f); + assertTrue(n.equals("F")); + + // Lookup::in teleporting to a class member and give full-power lookup + // calling findSpecial: lookupClass must be identical to specialCaller i.e. F + lookup = lookup.in(F.class); + assertTrue(lookup.hasPrivateAccess()); + MethodHandle mh2 = lookup.findSpecial(ThreadLocal.class, "initialValue", + methodType(Object.class), + F.class); + System.out.println("invoking protected ThreadLocal::initialValue"); + Object o = mh2.invokeExact(f); + } + } + + public static void test() throws Throwable { + Inner.test(); + } + + static void assertTrue(boolean v) { + if (!v) { + throw new AssertionError("expected true but got " + v); + } + } + + public static void main(String... args) throws Throwable { + test(); + } +}