Backwards compatibility of a serialized stream does not work for
following class evolution scenario.

A Serializable Class A is evolved in the following manner.

Add a new field, fieldA, to Class A.
The type of the field is also new and it is exernalizable.
Produce a serialized stream containing Class A.

Attempt to read the serialized stream using the original
Class A definition that did not include field A. Additionally,
the type of fieldA does not exist in this class path.

While reading an instance of A, the following stack trace is produced

java.io.StreamCorruptedException: Type code out of range, is 66
        at java.io.ObjectInputStream.peekCode(ObjectInputStream.java:1168)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:236)