1 /*
2 * Copyright (c) 2014, 2018, 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 * java.compiler
31 * java.management
32 * jdk.internal.jvmstat/sun.jvmstat.monitor
33 * @run testng ClassLoaderHierarchyTest
34 */
35
36 import org.testng.Assert;
37 import org.testng.annotations.Test;
38
39 import jdk.test.lib.process.OutputAnalyzer;
40 import jdk.test.lib.dcmd.CommandExecutor;
41 import jdk.test.lib.dcmd.JMXExecutor;
42
43 import java.io.File;
44 import java.io.FileInputStream;
45 import java.io.IOException;
46 import java.nio.ByteBuffer;
47 import java.nio.channels.FileChannel;
48
49 public class ClassLoaderHierarchyTest {
50
51 //+-- <bootstrap>
52 // |
53 // +-- "platform", jdk.internal.loader.ClassLoaders$PlatformClassLoader
54 // | |
55 // | +-- "app", jdk.internal.loader.ClassLoaders$AppClassLoader
56 // |
57 // +-- jdk.internal.reflect.DelegatingClassLoader
58 // |
59 // +-- "Kevin", ClassLoaderHierarchyTest$TestClassLoader
60 // |
61 // +-- ClassLoaderHierarchyTest$TestClassLoader
62 // |
63 // +-- "Bill", ClassLoaderHierarchyTest$TestClassLoader
64
65 public void run(CommandExecutor executor) throws ClassNotFoundException {
66
67 ClassLoader unnamed_cl = new TestClassLoader(null, null);
68 Class<?> c1 = Class.forName("TestClass2", true, unnamed_cl);
69 if (c1.getClassLoader() != unnamed_cl) {
70 Assert.fail("TestClass defined by wrong classloader: " + c1.getClassLoader());
71 }
72
73 ClassLoader named_cl = new TestClassLoader("Kevin", null);
74 Class<?> c2 = Class.forName("TestClass2", true, named_cl);
75 if (c2.getClassLoader() != named_cl) {
76 Assert.fail("TestClass defined by wrong classloader: " + c2.getClassLoader());
77 }
78
79 ClassLoader named_child_cl = new TestClassLoader("Bill", unnamed_cl);
80 Class<?> c3 = Class.forName("TestClass2", true, named_child_cl);
81 if (c3.getClassLoader() != named_child_cl) {
82 Assert.fail("TestClass defined by wrong classloader: " + c3.getClassLoader());
83 }
84
85 // First test: simple output, no classes displayed
86 OutputAnalyzer output = executor.execute("VM.classloaders");
87 output.shouldContain("<bootstrap>");
88 output.shouldMatch(".*TestClassLoader");
89 output.shouldMatch("Kevin.*TestClassLoader");
90 output.shouldMatch("Bill.*TestClassLoader");
91
92 // Second test: print with classes.
93 output = executor.execute("VM.classloaders show-classes");
94 output.shouldContain("<bootstrap>");
95 output.shouldContain("java.lang.Object");
96 output.shouldMatch(".*TestClassLoader");
97 output.shouldMatch("Kevin.*TestClassLoader");
98 output.shouldMatch("Bill.*TestClassLoader");
99 output.shouldContain("TestClass2");
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