Class java.io.OptionalDataException

java.lang.Object
   |
   +----java.lang.Throwable
           |
           +----java.lang.Exception
                   |
                   +----java.io.IOException
                           |
                           +----java.io.ObjectStreamException
                                   |
                                   +----java.io.OptionalDataException

public class OptionalDataException
extends ObjectStreamException

Unexpected data appeared in an ObjectInputStream trying to read an Object. This exception occurs when the stream contains primitive data instead of the object expected by readObject. The eof flag in the exception is true to indicate that no more primitive data is available. The count field contains the number of bytes available to read.