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/*
* Copyright (c) 2021, 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 org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import java.lang.reflect.Field;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.net.spi.InetAddressResolver;
import static org.testng.Assert.*;
/*
* @test
* @summary white-box test to check that the built-in resolver
* is used by default.
* @modules java.base/java.net:open
* @run testng/othervm BuiltInResolverTest
*/
public class BuiltInResolverTest {
private Field builtInResolverField, resolverField;
@BeforeTest
public void beforeTest() throws NoSuchFieldException {
Class<InetAddress> inetAddressClass = InetAddress.class;
// Needs to happen for InetAddress.resolver to be initialized
try {
InetAddress.getByName("test");
} catch (UnknownHostException e) {
// Do nothing, only want to assign resolver
}
builtInResolverField = inetAddressClass.getDeclaredField("BUILTIN_RESOLVER");
builtInResolverField.setAccessible(true);
resolverField = inetAddressClass.getDeclaredField("resolver");
resolverField.setAccessible(true);
}
@Test
public void testDefaultNSContext() throws IllegalAccessException {
// Test that the resolver used by default is the BUILTIN_RESOLVER
Object defaultResolverObject = builtInResolverField.get(InetAddressResolver.class);
Object usedResolverObject = resolverField.get(InetAddressResolver.class);
assertTrue(defaultResolverObject == usedResolverObject);
String defaultClassName = defaultResolverObject.getClass().getCanonicalName();
String currentClassName = usedResolverObject.getClass().getCanonicalName();
assertNotNull(defaultClassName, "defaultClassName not set");
assertNotNull(currentClassName, "currentClassName name not set");
assertEquals(currentClassName, defaultClassName,
"BUILTIN_RESOLVER resolver was not used.");
System.err.println("Resolver used by default is the built-in resolver");
}
}
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