A ObjectStreamClass describes a class that can be serialized to a stream
or a class that was serialized to a stream. It contains the name
and the serialVersionUID of the class.
The ObjectStreamClass for a specific class loaded in this Java VM can
be found using the lookup method.
Return the serialVersionUID for this class.
The serialVersionUID defines a set of classes all with the same name
that have evolved from a common root class and agree to be serialized
and deserialized using a common format.