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    How is JDO(Java Data Object) different from VO(Value Object) ?

    JDO is
    - a persistence technology
    -allows you to create POJOs (plain old java objects) and persist them to the database
    Value objects
    -usually referred as data holders but the correct term is DTO:
    -represent an abstract design pattern used in conjunction with entity beans, JDBC, and possibly even JDO to overcome commonly found isolation and transactional problems in enterprise apps.
    - do not allow you to persist objects - they are simple data holders used to transfer data from the database to the client and back to the database.

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