I am a client developer who has done some web stuff with PHP and mysql. However I am building a web application which requires the use of servlets (I am integrating some SDKs which are written in Java). But everything I seem to find is really, really, old. Like 20th century old. What gives? Are servlets and JSP outdated? Am I wasting my energy learning something which won't do me any good in the industry?

Even this forum seems to be dead by any normal standards...only about 4-5 posts a day in here.