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Compatible Changes :
Compatible changes are those changes which does not affect deSerialization process even if class was updated after being serialized (provided serialVersionUID has been declared)
- Adding new fields - We can add new member variables in class.
- Adding writeObject()/readObject() methods - We may add these methods to customize serialization process.
- Removing writeObject()/readObject() methods - We may remove these methods and then default customization process will be used.
- Changing access modifier of a field - The change to access modifiers i.e. public, default, protected, and private have no effect on the ability of serialization to assign values to the fields.
- Changing a field from static to non static OR changing transient filed to non transient field. - it’s like addition of fields.
InCompatible Changes :
InCompatible changes are those changes which affect deSerialization process if class was updated after being serialized (provided serialVersionUID has been declared)
- Deletion of fields. (http://stackoverflow.com/questions/16261383/delete-field-from-old-java-class-implementing-serializable)
- Changing a nonstatic field to static or non transient field to transient field. - it’s equal to deletion of fields.
- Modifying the writeObject() / readObject() method - we must not modify these method, though adding or removing them completely is compatible change.