https://*.com/questions/4490682/difference-between-java-ee-and-spring-framework
https://*.com/questions/19079798/spring-vs-java-ee-7/19080312#19080312
http://*.com/questions/4475899/frameworks-for-layering-reusable-architectures/4547358#4547358
http://www.oracle.com/technetwork/articles/java/springtojavaee4-1592643.html