1 /*
   2  * Copyright (c) 2005, 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 6783290
  27  * @summary Test correct reading of an empty Descriptor.
  28  * @author Jaroslav Bachorik
  29  *
  30  * @run clean SerializationTest1
  31  * @run build SerializationTest1
  32  * @run main SerializationTest1
  33  */
  34 
  35 import java.io.*;
  36 import javax.management.*;
  37 
  38 public class SerializationTest1 {
  39     public static void main(String[] args) throws Exception {
  40         MBeanInfo mi1 = new MBeanInfo("",
  41                                       "",
  42                                       new MBeanAttributeInfo[]{},
  43                                       new MBeanConstructorInfo[]{},
  44                                       new MBeanOperationInfo[]{},
  45                                       new MBeanNotificationInfo[]{},
  46                                       ImmutableDescriptor.EMPTY_DESCRIPTOR);
  47 
  48         test(mi1);
  49 
  50         MBeanFeatureInfo mfi2 = new MBeanFeatureInfo("",
  51                                                      "",
  52                                                      ImmutableDescriptor.EMPTY_DESCRIPTOR);
  53 
  54         test(mfi2);
  55     }
  56 
  57     public static void test(Object obj) throws Exception {
  58         ByteArrayOutputStream baos = new ByteArrayOutputStream();
  59         ObjectOutputStream oos = new ObjectOutputStream(baos);
  60         oos.writeObject(obj);
  61 
  62         final boolean[] failed = new boolean[]{false};
  63         ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
  64         final ObjectInputStream ois = new ObjectInputStream(bais) {
  65             protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
  66                 System.out.println("*** " + desc.getName());
  67                 if (desc.getName().equals("[Ljava.lang.Object;")) { // javax.management.Descriptor fields
  68                     Thread.dumpStack();
  69                     for(StackTraceElement e : Thread.currentThread().getStackTrace()) { // checking for the deserialization location
  70                         if (e.getMethodName().equals("skipCustomData")) { // indicates the presence of unread values from the custom object serialization
  71                             failed[0] = true;
  72                         }
  73                     }
  74                 }
  75                 return super.resolveClass(desc); //To change body of generated methods, choose Tools | Templates.
  76             }
  77         };
  78         Object newObj = ois.readObject();
  79 
  80         if (failed[0]) {
  81             throw new RuntimeException("Zero-length descriptor not read back");
  82         }
  83     }
  84 }