if it is that small amount of data, here is what would i do if there is NO JPA:
1- use an in memory data structure of your own. this is the fastest.
2- use an object database (easiest to query, but no SQL)
3- use H2 or a similar embedded db with a simple jdbc abstraction.
if there is JPA required, that is a shame.. the lightest weight one is toplink i think. Hibernate requires 10+ jars..
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