Welcome to the website of Davis Fiore

A web server can accepts http requests and send back a response, without using any EE technology.

An application server is composed by a servlet container and an EJB container, supporting all the EE technologies.

A servlet container can only run servlets and JSPs, whereas a EJB container can run also EJBs. You might use a servlet container alone, like in the case of Tomcat.

The typical configuration is:

Web browser <---> Web server <---> Application server <---> Database server

This is a multi-tier architecture, typically a three tier one:

• Client tier (browser)
• Middle tier (web server and application server)
• Data tier or resource tier (database, ERP or other resource)

The middle tier can be divided in:

• Presentation tier (html, css etc on the web server; plus jsp, servlet etc on the application server)
• Business tier (Ejb, java classes etc)
• Integration tier (JMS, JDBC etc)