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The
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The dao classes only exist for apps that talk to oracle thru Hibernate. They are usually generated by Hibernate.
Dao classes retrieve data from the database and convert it directly into biz model classes.
The service classes
There is normally only one service class per app. The service class' job is to get data from the back end and perform some biz logic on it and return it to the front end (actions). There should be one service interface and one class that implements it, e.g. OasSkeletonService, and OasSkeletonServiceImpl.
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