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For Hibernate apps, the service calls the daos to get biz objects and performs whatever biz logic is necessary on them.
The service spring beans are configured in applicationContext.xml (not in action-servlet.xml) as singletons. Because of this, there should be no instance variables defined for your service other than static variables that you intend to be accessed across threads (users). For instance, in the example below, a static variable, log, is defined. This means all users will write to the same log file which is the behavior you want.
