Hi,

Hibernate uses CGLib to avoid using reflection (and uses the runtime generated code).

Where can I find - How to use CGLib in my own project?

In a layered app one would have a DAO class which will use Hibernate fill up a POJO
and then map the Pojo to a Value Object (for use by the rest of the app)
and vice versa (map VO to a POJO for persisting)

Basically the POJO and VO are almost the same!

So would like to experiment with CGLib to write a single piece to achieve this mapping.
CGLib = optomized reflection is'nt it? :-)

In a Hibernate app, there are not many good reasons to use a VO (or DTO).

here-in VO is not Value Objects per se.

Those objects in my app are perfixed with 'VO'.

They are populated by business objects (by invoking JDBC) and made avalable to the UI layer. On the other side, values updated by users in the JSP, are received by the business object (in a VO) and persisted.

The goal - not to expose the objects handled by the database to objects handled by the UI layer.

Why?

Well thats the sad part.

I have joined this project midway and this VO + BO + DAO + JDBC layer is already in place. I had a hard time convincing my peers to incorporate Hibernate.
(Had been restricted to changing the JDBC layer alone. Cannot change the BO or VO)

But finally failed!

Reasons -
1. Time that will be required develop the 'binder' methods. Binding POJO to VO and vice versa. (so was looking up CGLib)
2. Trust! My peers have had a bad experience in the past with another open source OR tool - Castor.
3. They are not convinced about Hibernate performance as no public statistics are available.
4. Finally it looks like the existing architecture would have to be changed to incorporate Hibernate - especially because of the in-house transaction protocol built in.

PS: I have use hibernate in my previous projects and will always stand by it.

What you are looking for is called a DTO Assembler. It's not really Hibernate related, so you will find better answers if you Google for it.

thx