Session Facade vs Business Delegate - both do the same function of hiding the implementation details from the caller object. But the main difference is Session Facade must be an EJB object and it will reside on the server side( you can put the transaction limitations on the session facade). On the other hand the Business Delegate can be anything that doesn't involve EJBs and transaction boundaries; eg, a business delegate that accepts input from the web layer(JSF/JSP beans ) and forwards it to Service.
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