Serializable classes whose serialPersistentFields field
is not declared as private static final ObjectStreamField[].
If a serialPersistentFields field is not declared with those modifiers,
the serialization behavior will be as if the field was not declared at all.
Example:
class List implements Serializable {
private List next;
ObjectStreamField[] serialPersistentFields = {new ObjectStreamField("next", List.class)};
}