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Apache Tomcat
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===Catalina=== Catalina is Tomcat's [[Web container|servlet container]]. Catalina implements [[Sun Microsystems]]' specifications for [[Java servlet|servlet]] and JavaServer Pages (JSP). In Tomcat, a Realm element represents a "database" of usernames, passwords, and roles (similar to [[Unix]] groups) assigned to those users. Different implementations of Realm allow Catalina to be integrated into environments where such authentication information is already being created and maintained, and then use that information to implement Container Managed Security as described in the Servlet Specification.<ref>{{cite web|url=http://tomcat.apache.org/tomcat-5.5-doc/config/realm.html |title=Apache Tomcat Configuration Reference - The Realm Component |publisher=Tomcat.apache.org |access-date=2013-11-01}}</ref>
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