Hi,

I am new user of hibernate, I am designing and developing a system using JSP Model 2 architecture, in which i already have legacy database built in firebird. As it is a fairly big database, Im interested in using hibernate just to reduce the development time of writing data access logic and Java Beans. But In order to generate code I might have to use MiddleGen. Is MiddleGen also supporting Firebird and What is the best solution to avoid writing of Mapping documents.

Middlegen can reverse your database schema if you can get a JDBC driver for Firebird.
Middlegen is a robust tool but the user interface is not very efficient if you have to deal with large schemas.

In fact, Middlegen generates mapping files without problems for most cases.

Then, you can use hibernate tools package to generate Java classes based upon your generated mapping files.

The hibernate team has released an eclipse plugin which permits to reverse a database schema. I have not tried it yet. It's an alpha release.

See hibernate.org welcome page, for informations on tools.