1 /*
2 * Copyright (c) 2014, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2018, SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /*
26 * @test
27 * @summary Test of diagnostic command VM.classloaders
28 * @library /test/lib
29 * @modules java.base/jdk.internal.misc
30 * jdk.compiler
31 * jdk.internal.jvmstat/sun.jvmstat.monitor
32 * @run testng ClassLoaderHierarchyTest
33 */
34
35 import org.testng.Assert;
36 import org.testng.annotations.Test;
37
38 import jdk.test.lib.process.OutputAnalyzer;
39 import jdk.test.lib.dcmd.CommandExecutor;
40 import jdk.test.lib.dcmd.JMXExecutor;
41
42 import java.io.File;
43 import java.io.FileInputStream;
44 import java.io.IOException;
45 import java.nio.ByteBuffer;
46 import java.nio.channels.FileChannel;
47
48 public class ClassLoaderHierarchyTest {
49
50 //+-- <bootstrap>
51 // |
52 // +-- "platform", jdk.internal.loader.ClassLoaders$PlatformClassLoader
53 // | |
54 // | +-- "app", jdk.internal.loader.ClassLoaders$AppClassLoader
55 // |
56 // +-- jdk.internal.reflect.DelegatingClassLoader
57 // |
58 // +-- "Kevin", ClassLoaderHierarchyTest$TestClassLoader
59 // |
60 // +-- ClassLoaderHierarchyTest$TestClassLoader
61 // |
62 // +-- "Bill", ClassLoaderHierarchyTest$TestClassLoader
63
64 public void run(CommandExecutor executor) throws ClassNotFoundException {
65
66 ClassLoader unnamed_cl = new TestClassLoader(null, null);
67 Class<?> c1 = Class.forName("TestClass2", true, unnamed_cl);
68 if (c1.getClassLoader() != unnamed_cl) {
69 Assert.fail("TestClass defined by wrong classloader: " + c1.getClassLoader());
70 }
71
72 ClassLoader named_cl = new TestClassLoader("Kevin", null);
73 Class<?> c2 = Class.forName("TestClass2", true, named_cl);
74 if (c2.getClassLoader() != named_cl) {
75 Assert.fail("TestClass defined by wrong classloader: " + c2.getClassLoader());
76 }
77
78 ClassLoader named_child_cl = new TestClassLoader("Bill", unnamed_cl);
79 Class<?> c3 = Class.forName("TestClass2", true, named_child_cl);
80 if (c3.getClassLoader() != named_child_cl) {
81 Assert.fail("TestClass defined by wrong classloader: " + c3.getClassLoader());
82 }
83
84 // First test: simple output, no classes displayed
85 OutputAnalyzer output = executor.execute("VM.classloaders");
86 output.shouldContain("<bootstrap>");
87 output.shouldMatch(".*TestClassLoader");
88 output.shouldMatch("Kevin.*TestClassLoader");
89 output.shouldMatch("Bill.*TestClassLoader");
90
91 // Second test: print with classes.
92 output = executor.execute("VM.classloaders show-classes");
93 output.shouldContain("<bootstrap>");
94 output.shouldContain("java.lang.Object");
95 output.shouldMatch(".*TestClassLoader");
96 output.shouldMatch("Kevin.*TestClassLoader");
97 output.shouldMatch("Bill.*TestClassLoader");
98 output.shouldContain("TestClass2");
99 output.shouldContain("Hidden Classes:");
100 }
101
102 static class TestClassLoader extends ClassLoader {
103
104 public TestClassLoader() {
105 super();
106 }
107
108 public TestClassLoader(String name, ClassLoader parent) {
109 super(name, parent);
110 }
111
112 public static final String CLASS_NAME = "TestClass2";
113
114 static ByteBuffer readClassFile(String name)
115 {
116 File f = new File(System.getProperty("test.classes", "."),
117 name);
118 try (FileInputStream fin = new FileInputStream(f);
119 FileChannel fc = fin.getChannel())
120 {
121 return fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
122 } catch (IOException e) {
123 Assert.fail("Can't open file: " + name, e);
124 }
125
126 /* Will not reach here as Assert.fail() throws exception */
127 return null;
128 }
129
130 protected Class<?> loadClass(String name, boolean resolve)
131 throws ClassNotFoundException
132 {
133 Class<?> c;
134 if (!CLASS_NAME.equals(name)) {
135 c = super.loadClass(name, resolve);
136 } else {
137 // should not delegate to the system class loader
138 c = findClass(name);
139 if (resolve) {
140 resolveClass(c);
141 }
142 }
143 return c;
144 }
145
146 protected Class<?> findClass(String name)
147 throws ClassNotFoundException
148 {
149 if (!CLASS_NAME.equals(name)) {
150 throw new ClassNotFoundException("Unexpected class: " + name);
151 }
152 return defineClass(name, readClassFile(name + ".class"), null);
153 }
154
155 }
156
157 @Test
158 public void jmx() throws ClassNotFoundException {
159 run(new JMXExecutor());
160 }
161
162 }
163
164 class TestClass2 {
165 static {
166 Runnable r = () -> System.out.println("Hello");
167 r.run();
168 }
169 }
170