The Railo WAR is a general-purpose install method that is meant for use with any Java servlet container (such as Jetty, Tomcat, JBoss, Resin, and so on) that supports WAR deployments. If your organization is already using Java and a Java Servlet Engine, this will be an easy way to get an application up and running within your existing Java environment.
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What is a WAR?
In the context of Java Servlet Engines, a WAR file is a file that contains all the programs and classes that Java needs in order to run a single application. For Railo, this means that the WAR file contains all the programs and classes needed to run Railo and process CFML code.
WAR files can be deployed anywhere, on any operating system. Earlier in the chapter we covered installing to the Tomcat Servlet Engine under Windows OS. We will now cover installing Railo to a Jetty Servlet Engine running on top of an Ubuntu Linux machine.