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Hi,

What is difference between Asynchronous vs synchronous messaging (java) and how does it impact way in which messaging sender / receiver is implemented. how does a J2EE architecture decides to choose either.

+1  A: 

The Sun J2EE Blueprints cover this.

http://java.sun.com/blueprints/guidelines/designing_enterprise_applications_2e/eis-tier/eis-tier4.html

This particular article discusses interoperability with an EIS, but the principles are the same when using it for your own applications.

Trevor Tippins