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If your enterprise Java development is light weight and strictly avoids EJBs, you would probably consider Apache Tomcat as your first choice application server. However not only has Tomcat become rather heavy over time but it also isn't the only option you have. The list of Java servers is quite long, but it normally comes down to Tomcat, Jetty and Resin.Apache Tomcat is easily the most popular of the three and the "Powered By Tomcat" section lists some of the more well known names running Tomcat.