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What is difference between compatible and incompatible changes in serialization?
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Compatible changes
Some modifications that happed in serializable class after serialization (written to flat file / DB) but there is no exception during de-serialization is called compatible change. These are as below
1. Addition of new field.
2. Static field became non-static.
3. Transient field became non-transient
4. New super class added in class hierarchy.
Incompatible changes
Some modifications that happed in serializable class after serialization (written to flat file / DB) and there is an exception during de-serialization due to the changes is called incompatible change. These are as below
1. Delete existing field.
2. Non-static field became static.
3. Non-transient field became transient
4. Any super class removed in class hierarchy.
5. Field data type changed.
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