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Re: mapping data
If memory serves, one of the architects of JBoss said that the big
bottleneck in a J2EE application is the time spent marshalling and
unmarshalling data that's going to and from a relational database. To
avoid this problem, JBoss caches as much information as it can in Java
objects, and minimizes the number of reads and writes to the database.
It seems to me that a good data-mapping system would solve the same
problem in the opposite direction, so to speak.