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business delegate in petstore

 
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I'm studying j2ee petstore source code. I cannot find which part of source code support the business delegate pattern.
Could anybody help me?
 
patrick jiang
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Some patterns in Core J2EE patterns, 2nd Edition are not used in Petstore?
 
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please see in http://java.sun.com/blueprints/patterns/catalog.html
I think it help you
 
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