test/jdk/java/lang/reflect/Proxy/LazyInitializationTest.java - master - githubmirror/jdk22

test/jdk/java/lang/reflect/Proxy/LazyInitializationTest.java

58 строк2 KB

liach

8285401: Proxy class initializer should use 3-arg `Class.forName` to avoid unnecessary class initialization

31 май 2022, 21:30

31 май 2022, 21:30e0382c5

/*
 * Copyright (c) 2022, 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.
 */

import java.lang.reflect.Proxy;

import org.testng.Assert;
import org.testng.annotations.Test;

/*
 * @test
 * @bug 8285401
 * @summary Avoid initialization of parameter types in proxy construction
 * @run testng LazyInitializationTest
 */
public final class LazyInitializationTest {
    private static volatile boolean initialized = false;

    interface Intf {
        void m(Parameter parameter);
    }

    static class Parameter {
        static {
            initialized = true;
        }
    }

    @Test
    public void testLazyInitialization() {
        Intf value = (Intf) Proxy.newProxyInstance(LazyInitializationTest.class.getClassLoader(),
                new Class<?>[]{ Intf.class },
                (proxy, method, args) -> null);
        Assert.assertFalse(initialized, "parameter type initialized unnecessarily");

        value.m(new Parameter());
        Assert.assertTrue(initialized, "parameter type initialized after instantiation");
    }
}