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Java / Java Serialization

Give few examples of incompatible changes in Java serialization.

Changing implementation from Serializable to Externalizable interface,

Deleting an existing Serializable field,

Changing non-transient field to transient, non-static to static,

Changing the field type,

Updating the class package.

Modifying the writeObject() / readObject() method, we must not modify these methods, though adding or removing is a compatible change.

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