We have been using JDBC Access & SimpleJDBCTemplate/JDBCCall in our application for db access and are considering to move to
some ORM framework.
personally i have worked on JPA and Hibernate in the past but i read about many other orm frameworks
like toplink , iBatis, and Apache cayenn which ii read is very good.
Use the one that works best for your problem area. The first thing I'd ask myself is "why do I think I need to move to an ORM solution?" - Is your current JDBC solution too hard to maintain? Is there too much hand wiring? Is the code becoming difficult to maintain? Is it difficult to test? Once you've answered those questions you can beging to look at the other solutions and find out which ones solve the problems you're having.
If you don't do that you're making an ignorant decision which will generally be the wrong decision.