Chapter 11
The java.io Package

InvalidClassException

Name

Synopsis

Class Name:

java.io.InvalidClassException

Superclass:

java.io.ObjectStreamException

Immediate Subclasses:

None

Interfaces Implemented:

None

Availability:

New as of JDK 1.1

Description

An InvalidClassException is thrown during object serialization. It indicates that the run-time environment does not support a serialized class for one of the following reasons:

The version of the class does not match the serial version of the class in the stream.
The class contains unknown data types.

An InvalidClassException can also indicate one of these problems with the class itself:

The class implements only one of writeObject() and readObject().
The class is not public.
The class does not have an accessible constructor that takes no arguments.

Class Summary

public class java.io.InvalidClassException
             extends java.io.ObjectStreamException {
  // Variables
  public String classname;
  // Constructors
  public InvalidClassException(String reason);
  public InvalidClassException(String cname, String reason);
  // Instance Methods
  public String getMessage();
}

Variables

classname

public String classname

Description: The name of the class that caused the exception.

Constructors

InvalidClassException

public InvalidClassException(String reason)

Parameters

reason: The reason the exception was thrown.

Description

This constructor creates an InvalidClassException with the specified reason string.

public InvalidClassException(String cname, String reason)

Parameters

cname

The name of the class.

reason

The reason the exception was thrown.

Description

This constructor creates an InvalidClassException with the specified class name and reason string.

Instance Methods

getMessage

public String getMessage()

Returns

The reason string for this exception.

Overrides

Throwable.getMessage()

Description

This method returns the reason string for this exception. If a class name has also been specified, it is prepended to the reason string with a semicolon.

Inherited Methods

Method	Inherited From	Method	Inherited From
`clone()`	`Object`	`equals(Object)`	`Object`
`fillInStackTrace()`	`Throwable`	`finalize()`	`Object`
`getClass()`	`Object`	`getLocalizedMessage()`	`Throwable`
`getMessage()`	`Throwable`	`hashCode()`	`Object`
`notify()`	`Object`	`notifyAll()`	`Object`
`printStackTrace()`	`Throwable`	`printStackTrace(PrintStream)`	`Throwable`
`printStackTrace(PrintWriter)`	`Throwable`	`toString()`	`Object`
`wait()`	`Object`	`wait(long)`	`Object`
`wait(long, int)`	`Object`