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Batch job using JPA

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Came across this thread while searching JDBC vs JPA discussions.

I have batch application that fetches customer data (from multple tables), get it processed from an external app, stores the results back in same database (different set of tables). This batch has to run for around 100 thousand (100,000) customers.
We thought to use JPA with openJPA (sorry no hibernate) though no solid reason but it is proving to be slower than expected. Now, conteplating to switch to JDBC. Have not done JDBC test yet but inviting point of view if it is right approach?

It is sorta covered in the JavaRanch Style Guide.
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