Yeah, it's formally a part of the Java platform, and it's widely used, but I'd recommend becoming adept at using several different kinds of frameworks before I single one out. JSF, like all frameworks, will have advantages and disadvantages, and I'm sure there are Spring vs JSF holy wars, but the best advice someone can give a budding programmer is do not get caught up in that until you actually understand the underlying principles.

Spring and JSF are to some extent mutually exclusive. I worked on a project that used JSF views with Spring EL that called Spring beans. However, the best practice, according to BalusC on StackOverflow, is to avoid mixing Spring components and JSF managed beans (https://stackoverflow.com/questions/18387993/spring-jsf-inte...).

Exactly my point. Why are bootcamps teaching Spring, when JSF 2 is built-in and does it all better? Or at the very least should be assumed to be the future.