Answer / javamasque

The serial version UID is metadata about the serializable object, it is hash code for the serializable object. It contains information about class name, field name, field type, implemented interfaces and super classes. For each modification to serializable object, we have to update serial version UID explicitly. If we do not provide any serial version UID, JVM’s default serialization mechanism generates serial version UID for the object at runtime.

During deserialization, JVM matches the serial version UID from object stream with the serializable object which will receive the stream data. If there is a mismatch in serial version UID, JVM throws InvalidClassException

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