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ServiceLocator in Pet Store

 
Edy Yu
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I am browsing Pet Store 1.3.1 from Sun.
Any body can give me a reason why they use one service locator for web tier and the other for Business/EJB tier. The only difference I noticed is the web tier service locator "cache" the references.
 
Lasse Koskela
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Could it be because of (some of) the following:
a) they wanted to demonstrate two different ways of implementing the service locator pattern.
b) they didn't have the time/interest to write a configurable service locator (cache on/off)
I'm just guessing here...
 
Chris Mathews
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c) They wanted to decouple the Web and EJB tiers. Therefore making it much easier to locate them on separate JVMs or even separate physical boxes.
 
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