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/*
* Copyright (c) 2019, 2020, 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
* @summary define a lambda proxy class whose target class has an invalid
* nest membership
* @run testng/othervm p.LambdaNestedInnerTest
*/
package p;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Set;
import java.util.stream.Collectors;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;
import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
import static org.testng.Assert.*;
public class LambdaNestedInnerTest {
private static final String INNER_CLASSNAME = "p.LambdaNestedInnerTest$Inner";
private static final String DIR = "missingOuter";
public static class Inner implements Runnable {
// generate lambda proxy class
private Runnable lambda1 = this::doit;
@Override
public void run() {
// validate the lambda proxy class
Class<?> lambdaProxyClass = lambda1.getClass();
assertTrue(lambdaProxyClass.isHidden());
System.out.format("%s nest host %s nestmate of Inner class %s%n",
lambdaProxyClass, lambdaProxyClass.getNestHost(),
lambdaProxyClass.isNestmateOf(Inner.class));
assertTrue(lambdaProxyClass.getNestHost() == Inner.class.getNestHost());
assertTrue(Arrays.equals(lambdaProxyClass.getNestMembers(), Inner.class.getNestMembers()));
assertTrue(lambdaProxyClass.isNestmateOf(Inner.class));
lambda1.run();
}
// testng may not be visible to this class
private static void assertTrue(boolean x) {
if (!x) {
throw new AssertionError("expected true but found false");
}
}
private void doit() {
}
}
@BeforeTest
public void setup() throws IOException {
String filename = INNER_CLASSNAME.replace('.', File.separatorChar) + ".class";
Path src = Paths.get(System.getProperty("test.classes"), filename);
Path dest = Paths.get(DIR, filename);
Files.createDirectories(dest.getParent());
Files.copy(src, dest, REPLACE_EXISTING);
}
@Test
public void test() throws Exception {
Class<?> inner = Class.forName(INNER_CLASSNAME);
// inner class is a nest member of LambdaNestedInnerTest
Class<?> nestHost = inner.getNestHost();
assertTrue(nestHost == LambdaNestedInnerTest.class);
Set<Class<?>> members = Arrays.stream(nestHost.getNestMembers()).collect(Collectors.toSet());
assertEquals(members, Set.of(nestHost, inner, TestLoader.class));
// spin lambda proxy hidden class
Runnable runnable = (Runnable) inner.newInstance();
runnable.run();
}
@Test
public void nestHostNotExist() throws Exception {
URL[] urls = new URL[] { Paths.get(DIR).toUri().toURL() };
URLClassLoader loader = new URLClassLoader(urls, null);
Class<?> inner = loader.loadClass(INNER_CLASSNAME);
assertTrue(inner.getClassLoader() == loader);
assertTrue(inner.getNestHost() == inner); // linkage error ignored
Runnable runnable = (Runnable) inner.newInstance();
// this validates the lambda proxy class
runnable.run();
}
/*
* Tests IncompatibleClassChangeError thrown since the true nest host is not
* in the same runtime package as the hidden class
*/
@Test
public void nestHostNotSamePackage() throws Exception {
URL[] urls = new URL[] { Paths.get(DIR).toUri().toURL() };
TestLoader loader = new TestLoader(urls);
Class<?> inner = loader.loadClass(INNER_CLASSNAME);
assertTrue(inner.getClassLoader() == loader);
assertTrue(inner.getNestHost() == inner); // linkage error ignored.
Runnable runnable = (Runnable) inner.newInstance();
// this validates the lambda proxy class
runnable.run();
}
static class TestLoader extends URLClassLoader {
TestLoader(URL[] urls) {
super(urls, TestLoader.class.getClassLoader());
}
public Class<?> loadClass(String name) throws ClassNotFoundException {
if (INNER_CLASSNAME.equals(name)) {
return findClass(name);
} else {
// delegate to its parent
return loadClass(name, false);
}
}
}
}
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