Sunday, June 21, 2009

java serialization - a few tips

See link -- covers serialization in RMI.

* serialization = writing a *graph* of objects into a stream of data

* How to Make a Class Serializable
1. Implement the Serializable interface.
2. Make sure that instance-level, locally defined state is serialized properly.
3. Make sure that superclass state is serialized properly.
4. Override equals( ) and hashCode( ).

Making a class serializable rarely involves significant changes to its functionality and shouldn't result in any changes to method implementations. This means that it's fairly easy to retrofit serialization onto an existing object hierarchy. The hardest part is usually implementing equals( ) and hashCode( ).

on (2) above, i personally try to compose my objects with primitives, strings and simple arrays. What if there's a map field? I guess i have to customize its serialization.

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