1 /*
2 * Copyright (c) 2019, 2020, 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 * @summary define a lambda proxy class whose target class has an invalid
27 * nest membership
28 * @run testng/othervm p.LambdaNestedInnerTest
29 */
30
31 package p;
32
33 import java.io.File;
34 import java.io.IOException;
35 import java.net.URL;
36 import java.net.URLClassLoader;
37 import java.nio.file.Files;
38 import java.nio.file.Path;
39 import java.nio.file.Paths;
40 import java.util.Arrays;
41 import java.util.Set;
42 import java.util.stream.Collectors;
43
44 import org.testng.annotations.BeforeTest;
45 import org.testng.annotations.Test;
46
47 import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
48 import static org.testng.Assert.*;
49
50 public class LambdaNestedInnerTest {
51 private static final String INNER_CLASSNAME = "p.LambdaNestedInnerTest$Inner";
52 private static final String DIR = "missingOuter";
53 public static class Inner implements Runnable {
54 // generate lambda proxy class
55 private Runnable lambda1 = this::doit;
56
57 @Override
58 public void run() {
59 // validate the lambda proxy class
60 Class<?> lambdaProxyClass = lambda1.getClass();
61 assertTrue(lambdaProxyClass.isHidden());
62 System.out.format("%s nest host %s nestmate of Inner class %s%n",
63 lambdaProxyClass, lambdaProxyClass.getNestHost(),
64 lambdaProxyClass.isNestmateOf(Inner.class));
65 assertTrue(lambdaProxyClass.getNestHost() == Inner.class.getNestHost());
66 assertTrue(Arrays.equals(lambdaProxyClass.getNestMembers(), Inner.class.getNestMembers()));
67 assertTrue(lambdaProxyClass.isNestmateOf(Inner.class));
68 lambda1.run();
69 }
70
71 // testng may not be visible to this class
72 private static void assertTrue(boolean x) {
73 if (!x) {
74 throw new AssertionError("expected true but found false");
75 }
76 }
77
78 private void doit() {
79 }
80 }
81
82 @BeforeTest
83 public void setup() throws IOException {
84 String filename = INNER_CLASSNAME.replace('.', File.separatorChar) + ".class";
85 Path src = Paths.get(System.getProperty("test.classes"), filename);
86 Path dest = Paths.get(DIR, filename);
87 Files.createDirectories(dest.getParent());
88 Files.copy(src, dest, REPLACE_EXISTING);
89 }
90
91 @Test
92 public void test() throws Exception {
93 Class<?> inner = Class.forName(INNER_CLASSNAME);
94 // inner class is a nest member of LambdaNestedInnerTest
95 Class<?> nestHost = inner.getNestHost();
96 assertTrue(nestHost == LambdaNestedInnerTest.class);
97 Set<Class<?>> members = Arrays.stream(nestHost.getNestMembers()).collect(Collectors.toSet());
98 assertEquals(members, Set.of(nestHost, inner, TestLoader.class));
99
100 // spin lambda proxy hidden class
101 Runnable runnable = (Runnable) inner.newInstance();
102 runnable.run();
103 }
104
105 @Test
106 public void nestHostNotExist() throws Exception {
107 URL[] urls = new URL[] { Paths.get(DIR).toUri().toURL() };
108 URLClassLoader loader = new URLClassLoader(urls, null);
109 Class<?> inner = loader.loadClass(INNER_CLASSNAME);
110 assertTrue(inner.getClassLoader() == loader);
111 assertTrue(inner.getNestHost() == inner); // linkage error ignored
112
113 Runnable runnable = (Runnable) inner.newInstance();
114 // this validates the lambda proxy class
115 runnable.run();
116 }
117
118 /*
119 * Tests IncompatibleClassChangeError thrown since the true nest host is not
120 * in the same runtime package as the hidden class
121 */
122 @Test
123 public void nestHostNotSamePackage() throws Exception {
124 URL[] urls = new URL[] { Paths.get(DIR).toUri().toURL() };
125 TestLoader loader = new TestLoader(urls);
126
127 Class<?> inner = loader.loadClass(INNER_CLASSNAME);
128 assertTrue(inner.getClassLoader() == loader);
129 assertTrue(inner.getNestHost() == inner); // linkage error ignored.
130
131 Runnable runnable = (Runnable) inner.newInstance();
132 // this validates the lambda proxy class
133 runnable.run();
134 }
135
136 static class TestLoader extends URLClassLoader {
137 TestLoader(URL[] urls) {
138 super(urls, TestLoader.class.getClassLoader());
139 }
140 public Class<?> loadClass(String name) throws ClassNotFoundException {
141 if (INNER_CLASSNAME.equals(name)) {
142 return findClass(name);
143 } else {
144 // delegate to its parent
145 return loadClass(name, false);
146 }
147 }
148 }
149 }