1 /*
2 * Copyright (c) 2003, 2015, 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 * @bug 4909536
27 * @summary Ensure that the Introspector does not retain refs to classes
28 * @author Eamonn McManus
29 * @modules java.management
30 * @run clean ClassLeakTest
31 * @run build ClassLeakTest
32 * @run main ClassLeakTest
33 */
34
35 import java.lang.ref.WeakReference;
36 import java.io.File;
37 import java.nio.file.Paths;
38 import java.net.*;
39 import java.util.*;
40
41 import javax.management.*;
42 import javax.management.loading.*;
43
44 public class ClassLeakTest {
45 public static void main(String[] args) throws Exception {
46 System.out.println("Testing that registering and unregistering a " +
47 "Standard MBean does not retain a reference to " +
48 "the MBean's class");
49
50
51 String[] cpaths = System.getProperty("test.classes", ".")
52 .split(File.pathSeparator);
53 URL[] urls = new URL[cpaths.length];
54 for (int i=0; i < cpaths.length; i++) {
55 urls[i] = Paths.get(cpaths[i]).toUri().toURL();
56 }
57
58 PrivateMLet mlet = new PrivateMLet(urls, null, false);
59 Class<?> shadowClass = mlet.loadClass(TestMBean.class.getName());
60 if (shadowClass == TestMBean.class) {
61 System.out.println("TEST INVALID: MLet got original " +
62 "TestMBean not shadow");
63 System.exit(1);
64 }
65 shadowClass = null;
66
67 MBeanServer mbs = MBeanServerFactory.createMBeanServer();
68 ObjectName mletName = new ObjectName("x:type=mlet");
69 mbs.registerMBean(mlet, mletName);
70
71 ObjectName testName = new ObjectName("x:type=test");
72 mbs.createMBean(Test.class.getName(), testName, mletName);
73
74 ClassLoader testLoader = mbs.getClassLoaderFor(testName);
75 if (testLoader != mlet) {
76 System.out.println("TEST INVALID: MBean's class loader is not " +
77 "MLet: " + testLoader);
78 System.exit(1);
79 }
80 testLoader = null;
81
82 MBeanInfo info = mbs.getMBeanInfo(testName);
83 MBeanAttributeInfo[] attrs = info.getAttributes();
84 if (attrs.length != 1 || !attrs[0].getName().equals("A")
85 || !attrs[0].isReadable() || !attrs[0].isWritable()
86 || attrs[0].isIs() || !attrs[0].getType().equals("int")) {
87 System.out.println("TEST FAILED: unexpected MBeanInfo attrs");
88 System.exit(1);
89 }
90 MBeanOperationInfo[] ops = info.getOperations();
91 if (ops.length != 1 || !ops[0].getName().equals("bogus")
92 || ops[0].getSignature().length > 0
93 || ops[0].getImpact() != MBeanOperationInfo.UNKNOWN
94 || !ops[0].getReturnType().equals("void")) {
95 System.out.println("TEST FAILED: unexpected MBeanInfo ops");
96 System.exit(1);
97 }
98 if (info.getConstructors().length != 2) {
99 System.out.println("TEST FAILED: wrong number of constructors " +
100 "in introspected bean: " +
101 Arrays.asList(info.getConstructors()));
102 System.exit(1);
103 }
104 if (!info.getClassName().endsWith("Test")) {
105 System.out.println("TEST FAILED: wrong info class name: " +
106 info.getClassName());
107 System.exit(1);
108 }
109
110 mbs.unregisterMBean(testName);
111 mbs.unregisterMBean(mletName);
112
113 WeakReference mletRef = new WeakReference(mlet);
114 mlet = null;
115
116 System.out.println("MBean registered and unregistered, waiting for " +
117 "garbage collector to collect class loader");
118 for (int i = 0; i < 10000 && mletRef.get() != null; i++) {
119 System.gc();
120 Thread.sleep(1);
121 }
122
123 if (mletRef.get() == null)
124 System.out.println("Test passed: class loader was GC'd");
125 else {
126 System.out.println("TEST FAILED: class loader was not GC'd");
127 System.exit(1);
128 }
129 }
130
131 public static interface TestMBean {
132 public void bogus();
133 public int getA();
134 public void setA(int a);
135 }
136
137 public static class Test implements TestMBean {
138 public Test() {}
139 public Test(int x) {}
140
141 public void bogus() {}
142 public int getA() {return 0;}
143 public void setA(int a) {}
144 }
145 }