For a new job, the HR gave me list of Java technologies to study: JSP/Servlet Ant, Maven Hibernate Spring Core, Spring MVC REST JMS Mongo, Cassandra Solr, Elastic Search I have never been a java guy, but I am ready to learn these, but I need to know where all these technologies lead to, are they worth doing? and how long will they approximately take if I have university level experience in programming and CS?