As a developer, you need not write infrastructure code for these services, rather vendors provide EJB container/server that support all these services. You simply use these services without writing any code for them. But all these services do not come for free , they are expensive and come with a price. So before writing an application you need to carefully look into all the aspects for optimum use of your resources and calculate the tradeoffs involved.
Updated: 03/24/2005
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