InvalidClassException (Java SE 12 & JDK 12 )

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:

1.1

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

String classname
Name of the invalid class.

Constructor Summary

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

Method Summary

Modifier and Type Method Description

String getMessage()
Produce the message and include the classname, if present.
- Methods declared in class java.lang.Throwable
  addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString
- Methods declared in 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 an 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).