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J2EE Context Object design pattern

 
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Hi all,
I have uderstood all the J2EE design patterns except the Context Object pattern(implementaion part). Can any one give me a simple example for J2EE Context Object deisgn pattern. I have understood Context Objects are used to share infrastructure information across the tiers in a protocol independent way. Also I have undestood It's similar to the Transfer Object but the difference is , the Transfer Object is used for carrying business information across tiers. What infrastructure (security,request,configuration) info is carried by a Context Object? Any simple example on this pattern would be very much appreciated rather than an explanation thanks in advance
 
Arun Somasundaram
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