In my last post I have introduced the code classification used by the Helsinki declaration (as opposed to MVC used by JEE):User Interface (UI) code: all code that creates UI and responds to events in the UI, the same as JEE's View and ControlData Logic (DL) code: all code that maintains data integrity constraints, a well defined subset of JEE's ModelBusiness Logic (BL) code: all other code, the
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