1   /*
2    * Copyright (c) 2004, 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 5056248
27   * @summary Test that an MBeanInfo works even if it is deserialized from
28   * an implementation where its array fields can be null.
29   * @author Eamonn McManus
30   * @run clean NullInfoArraysTest
31   * @run build NullInfoArraysTest
32   * @run main NullInfoArraysTest
33   */
34  
35  import java.io.*;
36  import javax.management.*;
37  import javax.management.modelmbean.*;
38  import javax.management.openmbean.*;
39  
40  public class NullInfoArraysTest {
41      public static void main(String[] args) throws Exception {
42          if (args.length > 0 && args[0].equals("write"))
43              writeSerializedForms();
44          else
45              testSerializedForms();
46      }
47  
48      private static void testSerializedForms() throws Exception {
49          byte[][] serializedMBeanInfos =
50              SerializedMBeanInfo.serializedMBeanInfos;
51          for (int i = 0; i < serializedMBeanInfos.length; i++) {
52              byte[] serializedMBeanInfo = serializedMBeanInfos[i];
53              ByteArrayInputStream bis =
54                  new ByteArrayInputStream(serializedMBeanInfo);
55              ObjectInputStream ois = new ObjectInputStream(bis);
56              MBeanInfo mbi = (MBeanInfo) ois.readObject();
57  
58              System.out.println("Testing a " +
59                                 mbi.getClass().getName() + "...");
60  
61              if (mbi.getAttributes() == null ||
62                  mbi.getOperations() == null ||
63                  mbi.getConstructors() == null ||
64                  mbi.getNotifications() == null)
65                  throw new Exception("At least one getter returned null");
66  
67              System.out.println("OK");
68          }
69  
70          System.out.println("Test passed");
71      }
72  
73      /* This method is intended to be invoked when constructing the
74         test for the first time, with JMX 1.1 RI in the classpath.  It
75         constructs the SerializedMBeanInfo.java source file.  There is
76         of course a chicken-and-egg problem for compiling: the first
77         time we built this test, we supplied a trivial
78         SerializedMBeanInfo.java with an empty array in the
79         serializedMBeanInfos field.  */
80      private static void writeSerializedForms() throws Exception {
81          OutputStream fos = new FileOutputStream("SerializedMBeanInfo.java");
82          PrintWriter w = new PrintWriter(fos);
83          w.println("// Generated by NullInfoArraysTest - do not edit");
84          w.println();
85          w.println("public class SerializedMBeanInfo {");
86          w.println("    public static final byte[][] serializedMBeanInfos = {");
87          writeSerial(w, new MBeanInfo(null, null, null, null, null, null));
88          writeSerial(w, new ModelMBeanInfoSupport(null, null, null, null, null,
89                                                   null, null));
90          writeSerial(w, new OpenMBeanInfoSupport(null, null, null, null, null,
91                                                  null));
92          w.println("    };");
93          w.println("}");
94          w.close();
95          fos.close();
96          System.out.println("Wrote SerializedMBeanInfo.java");
97      }
98  
99      private static void writeSerial(PrintWriter w, Object o) throws Exception {
100         ByteArrayOutputStream bos = new ByteArrayOutputStream();
101         ObjectOutputStream oos = new ObjectOutputStream(bos);
102         oos.writeObject(o);
103         oos.close();
104         byte[] bytes = bos.toByteArray();
105         w.print("        {");
106         for (int i = 0; i < bytes.length; i++) {
107             w.print(bytes[i]);
108             w.print(", ");
109         }
110         w.println("},");
111     }
112 }