This week, I was faced with what seemed an near-insuperable problem. I was called by one of my dev: as soon as he upgraded his Eclipse (or more precisely, our own already-configured Eclipse), he couldn’t deploy to Tomcat through WTP. Here are the steps I took to resolve the problem and more general thoughts about upgrading and tooling. The log displayed a ClassNotFoundException, one involving Spring. So, the first step is to look under the hood. Provided you used the default configuration