Application Services Tier
Design strategies for increased availability for the Application Services tier can become complex because of the different entities with varying availability requirements. Some entities require failover mechanisms and some do not. This section presents a survey of various availability strategies implemented by various vendors and then discusses examples of the various Sun ONE Application Server architectures and associated availability strategies.
At the Application Server tier, you are working with the following entities:
HttpSession – This is the client session object that the Web container creates and manages for each client HTTP request. Session failover mechanisms were described in the previous section.
Stateless ...
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