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design pattern question

 
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MVC can centrally control 'security', but not 'datebase functionality' -- is this correct? Isn't 'M' is for DB functionality?

Service locator can be used in EJB tier -- is this correct? I thought this pattern is only used in client side.

Please correct me if I'm wrong.
 
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Please go through this thread.

similar questions are in Bavid Bridhewater's book
i guess Service locator can be used in any tier. ( as said in david bridgewater's chpter mock test )

hth
 
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