1 /*
2  * Copyright (c) 2004, 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 4974913
27  * @summary Test that array classes can be found in signatures always
28  * and can be deserialized by the deprecated MBeanServer.deserialize method
29  * @author Eamonn McManus
30  *
31  * @run clean ArrayClassTest
32  * @run build ArrayClassTest
33  * @run main ArrayClassTest
34  */
35 
36 import java.io.*;
37 import java.lang.reflect.*;
38 import java.net.*;
39 import java.nio.file.Paths;
40 import javax.management.*;
41 import javax.management.loading.*;
42 
43 public class ArrayClassTest {
main(String[] args)44     public static void main(String[] args) throws Exception {
45         MBeanServer mbs = MBeanServerFactory.createMBeanServer();
46 
47         String[] cpaths = System.getProperty("test.classes", ".")
48                                 .split(File.pathSeparator);
49         URL[] urls = new URL[cpaths.length];
50         for (int i=0; i < cpaths.length; i++) {
51             urls[i] = Paths.get(cpaths[i]).toUri().toURL();
52         }
53 
54         // Create an MLet that can load the same class names but
55         // will produce different results.
56         ClassLoader loader = new SpyLoader(urls);
57         ObjectName loaderName = new ObjectName("test:type=SpyLoader");
58         mbs.registerMBean(loader, loaderName);
59 
60         ObjectName testName = new ObjectName("test:type=Test");
61         mbs.createMBean(Test.class.getName(), testName, loaderName,
62                         new Object[1], new String[] {X[].class.getName()});
63         ClassLoader checkLoader = mbs.getClassLoaderFor(testName);
64         if (checkLoader != loader)
65             throw new AssertionError("Wrong loader: " + checkLoader);
66 
67         mbs.invoke(testName, "ignore", new Object[1],
68                    new String[] {Y[].class.getName()});
69 
70         ByteArrayOutputStream bout = new ByteArrayOutputStream();
71         ObjectOutputStream oout = new ObjectOutputStream(bout);
72         oout.writeObject(new Z[0]);
73         oout.close();
74         byte[] bytes = bout.toByteArray();
75         ObjectInputStream oin = mbs.deserialize(testName, bytes);
76         Object zarray = oin.readObject();
77         String failed = null;
78         if (zarray instanceof Z[])
79             failed = "read back a real Z[]";
80         else if (!zarray.getClass().getName().equals(Z[].class.getName())) {
81             failed = "returned object of wrong type: " +
82                 zarray.getClass().getName();
83         } else if (Array.getLength(zarray) != 0)
84             failed = "returned array of wrong size: " + Array.getLength(zarray);
85         if (failed != null) {
86             System.out.println("TEST FAILED: " + failed);
87             System.exit(1);
88         }
89 
90         System.out.println("Test passed");
91     }
92 
93     public static interface TestMBean {
ignore(Y[] ignored)94         public void ignore(Y[] ignored);
95     }
96 
97     public static class Test implements TestMBean {
Test(X[] ignored)98         public Test(X[] ignored) {}
ignore(Y[] ignored)99         public void ignore(Y[] ignored) {}
100     }
101 
102     public static class X {}
103     public static class Y {}
104     public static class Z implements Serializable {}
105 
106     public static interface SpyLoaderMBean {}
107 
108     /* We originally had this extend MLet but for some reason that
109        stopped the bug from happening.  Some side-effect of registering
110        the MLet in the MBean server caused it not to fail when asked
111        to load Z[].  */
112     public static class SpyLoader extends URLClassLoader
113             implements SpyLoaderMBean, PrivateClassLoader {
SpyLoader(URL[] urls)114         public SpyLoader(URL[] urls) {
115             // important that the parent classloader be null!
116             // otherwise we can pick up classes from the classpath
117             super(urls, null);
118         }
119 
120         /*
121         public Class loadClass(String name) throws ClassNotFoundException {
122             System.out.println("loadClass: " + name);
123             return super.loadClass(name);
124         }
125 
126         public Class loadClass(String name, boolean resolve)
127                 throws ClassNotFoundException {
128             System.out.println("loadClass: " + name + ", " + resolve);
129             return super.loadClass(name, resolve);
130         }
131         */
132 
findClass(String name)133         public Class findClass(String name) throws ClassNotFoundException {
134             System.out.println("findClass: " + name);
135             if (false)
136                 new Throwable().printStackTrace(System.out);
137             Class c = super.findClass(name);
138             System.out.println(" -> " + name + " (" + c.getClassLoader() + ")");
139             return c;
140         }
141     }
142 }
143