What Is a Pattern?
In Chapter 1, we discussed how different experts define a pattern. We also discussed some of the peripheral issues around patterns including the benefits of using patterns. Here, we revisit this discussion in the context of the J2EE Pattern Catalog.
As discussed in Chapter 1, some experts define a pattern as a recurring solution to a problem in a context. These terms—context, problem, and solution—deserve a bit of explanation. First, what is a context? A context is the environment, surroundings, situation, or interrelated conditions within which something exists. Second, what is a problem? A problem is an unsettled question, something that needs to be investigated and solved. Typically, the problem is constrained by the context ...
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