I'd like to explore some things regarding web CMS's in java and I would like to make an own one (very light), but I pretty much have no clue in how to begin. I'm used to java as a language and I've made some similar things in PHP, but I've never used servlets or java techniques in this matter.
Is there any "tutorial" or similar in this subject that I could have as a reference? Or any open source project that is very light with low dependencies?