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Rod, the creator of Spring framework and member of the JDO expert group, has published a presentation about the persistence hot theme and how Spring resolve it in excellent way.
Rod tells that OR-Mapping tools (JDO, Hibernate, TopLink, etc.) can resolve the 90% of use cases. In the others you can use SQL directly by the Spring's JdbcTemplate.
Interesting article ;-)
Here you can follow the thread on TheServerSide.com: http://www.theserverside.com/news/thread.tss?thread_id=35233
Spring framework home: http://www.springframework.org