The Great Java Application Server Debate

http://zeroturnaround.com/rebellabs/the-great-java-application-server-debate-with-tomcat-jboss-glassfish-jetty-and-liberty-profile/
http://en.wikipedia.org/wiki/Application_server
http://www.javaworld.com/article/2077826/open-source-tools/tomcat-in-the-enterprise.html
http://docs.oracle.com/cd/E19830-01/819-4712/ablat/index.html

Java Platform, Enterprise Edition or Java EE (was J2EE) defines the core set of API and features of Java Application Servers.

(Application Server & Web Container ?)