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…