1 /*
   2  * Copyright (c) 1996, 2019, 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.io;
  27 
  28 /**
  29  * Thrown when the Serialization runtime detects one of the following
  30  * problems with a Class.
  31  * <UL>
  32  * <LI> The serial version of the class does not match that of the class
  33  *      descriptor read from the stream
  34  * <LI> The class contains unknown datatypes
  35  * <LI> The class does not have an accessible no-arg constructor
  36  * <LI> The ObjectStreamClass of an enum constant does not represent
  37  * an enum type
  38  * <LI> Other conditions given in the <cite>Java Object Serialization
  39  * Specification</cite>
  40  * </UL>
  41  *
  42  * @author  unascribed
  43  * @since   1.1
  44  */
  45 public class InvalidClassException extends ObjectStreamException {
  46 
  47     @java.io.Serial
  48     private static final long serialVersionUID = -4333316296251054416L;
  49 
  50     /**
  51      * Name of the invalid class.
  52      *
  53      * @serial Name of the invalid class.
  54      */
  55     public String classname;
  56 
  57     /**
  58      * Report an InvalidClassException for the reason specified.
  59      *
  60      * @param reason  String describing the reason for the exception.
  61      */
  62     public InvalidClassException(String reason) {
  63         super(reason);
  64     }
  65 
  66     /**
  67      * Constructs an InvalidClassException object.
  68      *
  69      * @param cname   a String naming the invalid class.
  70      * @param reason  a String describing the reason for the exception.
  71      */
  72     public InvalidClassException(String cname, String reason) {
  73         super(reason);
  74         classname = cname;
  75     }
  76 
  77     /**
  78      * Produce the message and include the classname, if present.
  79      */
  80     public String getMessage() {
  81         if (classname == null)
  82             return super.getMessage();
  83         else
  84             return classname + "; " + super.getMessage();
  85     }
  86 }