java - Transitioning from Castor to JPA -


I am trying to make my Java application more compliant and the biggest problems I am facing One of them, to our ORM framework, to Castro JDO, thinking of a JPA implementation (either hibernate or data nucleus). We have our continuous data absorption layer, so the basic refactoring can be done easily by applying a JPA to our API and making mapping. So it becomes more complex, we use Castor OQL, not heavy but not trivial, and this is not the essence. We make direct JDBC queries in the database, but go through Castor to get the connection. We are using eBooks to cache our objects between multiple servers.

Question:

1) In general, how do Caster and J.A. know about the interconnected objects in which I should be?

2) Does the JPA query language offer the same features as Castor OCL? Or will I need to check the JDO?

3) Can I use Digit with any JPA implementation?

4) Any one device knows which JAPA mapping from castor mapping?

Finally, I think, any ideas on the strength of implementing various JPAs? Hibernate is attractive because it is used very widely, but my biggest concern is simplicity, so maybe the data Nucleus, EclipseLink (or something) can serve me better?

Thanks,

/ P>

A good choice when Castor The transition is being done because eclipseelink is a JPA provider and supports the Castor object such as -xml mapping (using component).


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