1 /*
2 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @build LambdaNestedInnerTest
27 * @run testng/othervm p.LambdaNestedInnerTest
28 * @summary define a lambda proxy class whose target class has an invalid
29 * nest membership
30 */
31
32 package p;
33
34 import java.io.File;
35 import java.io.IOException;
36 import java.net.URL;
37 import java.net.URLClassLoader;
38 import java.nio.file.Files;
39 import java.nio.file.Path;
40 import java.nio.file.Paths;
41 import java.util.Arrays;
42 import java.util.Set;
43 import java.util.stream.Collectors;
44
45 import org.testng.annotations.BeforeTest;
46 import org.testng.annotations.Test;
47
48 import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
49 import static org.testng.Assert.*;
50
51 public class LambdaNestedInnerTest {
52 private static final String INNER_CLASSNAME = "p.LambdaNestedInnerTest$Inner";
53 private static final String DIR = "missingOuter";
54 public static class Inner implements Runnable {
55 // generate lambda proxy class
56 private Runnable lambda1 = this::doit;
57
58 @Override
59 public void run() {
60 // validate the lambda proxy class
61 Class<?> lambdaProxyClass = lambda1.getClass();
62 assertTrue(lambdaProxyClass.isHiddenClass());
63 System.out.format("%s nest host %s nestmate of Inner class %s%n",
64 lambdaProxyClass, lambdaProxyClass.getNestHost(),
65 lambdaProxyClass.isNestmateOf(Inner.class));
66 assertTrue(lambdaProxyClass.getNestHost() == Inner.class.getNestHost());
67 assertTrue(Arrays.equals(lambdaProxyClass.getNestMembers(), Inner.class.getNestMembers()));
68 assertTrue(lambdaProxyClass.isNestmateOf(Inner.class));
69 lambda1.run();
70 }
71
72 // testng may not be visible to this class
73 private static void assertTrue(boolean x) {
74 if (!x) {
75 throw new AssertionError("expected true but found false");
76 }
77 }
78
79 private void doit() {
80 }
81 }
82
83 @BeforeTest
84 public void setup() throws IOException {
85 String filename = INNER_CLASSNAME.replace('.', File.separatorChar) + ".class";
86 Path src = Paths.get(System.getProperty("test.classes"), filename);
87 Path dest = Paths.get(DIR, filename);
88 Files.createDirectories(dest.getParent());
89 Files.copy(src, dest, REPLACE_EXISTING);
90 }
91
92 @Test
93 public void test() throws Exception {
94 Class<?> inner = Class.forName(INNER_CLASSNAME);
95 // inner class is a nest member of LambdaNestedInnerTest
96 Class<?> nestHost = inner.getNestHost();
97 assertTrue(nestHost == LambdaNestedInnerTest.class);
98 Set<Class<?>> members = Arrays.stream(nestHost.getNestMembers()).collect(Collectors.toSet());
99 assertEquals(members, Set.of(nestHost, inner, TestLoader.class));
100
101 // spin lambda proxy hidden class
102 Runnable runnable = (Runnable) inner.newInstance();
103 runnable.run();
104 }
105
106 @Test
107 public void nestHostNotExist() throws Exception {
108 URL[] urls = new URL[] { Paths.get(DIR).toUri().toURL() };
109 URLClassLoader loader = new URLClassLoader(urls, null);
110 Class<?> inner = loader.loadClass(INNER_CLASSNAME);
111 assertTrue(inner.getClassLoader() == loader);
112 assertTrue(inner.getNestHost() == inner); // linkage error ignored
113
114 Runnable runnable = (Runnable) inner.newInstance();
115 // this validates the lambda proxy class
116 runnable.run();
117 }
118
119 /*
120 * Tests IncompatibleClassChangeError thrown since the true nest host is not
121 * in the same runtime package as the hidden class
122 */
123 @Test
124 public void nestHostNotSamePackage() throws Exception {
125 URL[] urls = new URL[] { Paths.get(DIR).toUri().toURL() };
126 TestLoader loader = new TestLoader(urls);
127
128 Class<?> inner = loader.loadClass(INNER_CLASSNAME);
129 assertTrue(inner.getClassLoader() == loader);
130 assertTrue(inner.getNestHost() == inner); // linkage error ignored.
131
132 Runnable runnable = (Runnable) inner.newInstance();
133 // this validates the lambda proxy class
134 runnable.run();
135 }
136
137 static class TestLoader extends URLClassLoader {
138 TestLoader(URL[] urls) {
139 super(urls, TestLoader.class.getClassLoader());
140 }
141 public Class<?> loadClass(String name) throws ClassNotFoundException {
142 if (INNER_CLASSNAME.equals(name)) {
143 return findClass(name);
144 } else {
145 // delegate to its parent
146 return loadClass(name, false);
147 }
148 }
149 }
150 }