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Using OOP in Java while using a relational DB in the backend

 
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Hi Guys

Im working on a App for a project of Masters leve, I want to know if theres a violation in OOP principles if I use a relational database, with weak entities and the following concepts, appreciate an earliest response, and will there be any compliction with the follownig aswell.
 
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There's actually a name for that: Object Relational Impedance Mismatch/ I recommend you check out this link and then post a reply with any questions you may have.
 
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