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Difference between Business Delegate Pattern and Session Facade pattern ??

 
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Hi Folks,
First of all let me thank the javaranch community for providing an excellent resource to share information.
My question relates to J2EE patterns portion of SCWCD exam. I was going through the patterns listed in the Sun website but struggled to find the difference between Business delegate and Session facade pattern. Can anyone shed some light on this matter.
Thanks for your time.
Rama Mulukutla
SCJ2P.
 
Rama Mulukutla
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Thanks, That helps clarify
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