What is business delicate Use and session faced use?

Business delicate is a small java bean object which is used for make loose coupling b/w controller to model.Session facade design pattern in which palce session bean b/w model to contriller.why beacuse sesssion bean process the business logic . if you place business logic in model(entity beans) you loss the reusabiity of entity beans. if you place business logic within the controller ,this makes tightly coupling b/w model to controller.:Business De ligate:- This design pattern provides client side abstraction over business services. It provides standard way of accessing business services across the application. Client need not to worry about implementation of business services like JMS, JNDI, Java Mail,Data source etc.
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