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## java.io
Class InvalidClassException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              java.io.IOException
                  java.io.ObjectStreamException
                      java.io.InvalidClassException

All Implemented Interfaces:
  Serializable

public class InvalidClassException
extends ObjectStreamException

Thrown when the Serialization runtime detects one of the following problems with a Class.

- The serial version of the class does not match that of the class descriptor read from the stream
- The class contains unknown datatypes
- The class does not have an accessible no-arg constructor

Since:
  JDK1.1
See Also:
  Serialized Form

Field Summary
`String` | `classname` Name of the invalid class.

Constructor Summary
`InvalidClassException(String reason)` Report a InvalidClassException for the reason specified.
`InvalidClassException(String cname, String reason)` Constructs an InvalidClassException object.

Method Summary
`String` | `getMessage()` Produce the message and include the classname, if present.

Methods inherited from class java.lang.Throwable
`fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### classname

    public String classname

  Name of the invalid class.

Constructor Detail

### InvalidClassException

    public InvalidClassException(String reason)

  Report a InvalidClassException for the reason specified.

Parameters:
  `reason` - String describing the reason for the exception.

### InvalidClassException

    public InvalidClassException(String cname,
                                 String reason)

  Constructs an InvalidClassException object.

Parameters:
  `cname` - a String naming the invalid class.
  `reason` - a String describing the reason for the exception.

Method Detail

### getMessage

    public String getMessage()

  Produce the message and include the classname, if present.

  Overrides:
    `getMessage` in class `Throwable`
  Returns:
    the detail message string of this `Throwable` instance (which may be `null`).

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.