Hello. I would like to get advice about my career. I'm working on web applications using java. I develop both front and back -end. I find this not interesting because it's always receive a request, change/query the DB, return a model, and render the page. When I talk to recruiters they ask me am I looking for J2EE or Core Java. It seems to me that I should be aiming at Core Java. I started to study multi-threading, for example, and I plan to study the Collections framework. So my question is: does this make sense?