<p>This method implements Serializable but is derived from a
class that does not. The super class has fields that are not serialized
because this class does not take the responsibility of writing these fields out
either using Serializable's writeObject method, or Externalizable's writeExternal
method. Therefore when this class is read from a stream, the superclass fields
will only be initialized to the values specified in it's default constructor.
If possible, change the superclass to implement Serializable, or implement
Serializable or Externalizable methods in the child class.</p>