Hey all!

This is my first post since I joined Interface21 last month. My previous blog is now officially deprecated and I won't be updating it anymore.

So what is the subject of my first post (except to introduce myself)?  Validation logic.  It won't be a walkthrough of how to perform validation in the Spring framework, rather it will discuss a particular bug bear of mine :)

In particular, I would like to discuss exactly what should go into validation logic.  It seems to be a no-brainer answer; "logic to validate the specified data".  OK, that is a no-brainer but read on :). As you know, the Spring framework provides a nice abstraction layer for your validation, via the Errors and Validator interfaces.  In particular the Validator is where you apply your business specific validation rules to your populated domain object.  Spring's excellent binding support is responsible for updating your domain model…