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