Apache Tomcat

The Apache Tomcat software is an open source implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies. Apache Tomcat software powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations. It is intended to be a collaboration of the best-of-breed developers from around the world.

• Deployer - Operating the Tomcat Deployer to deploy, precompile, and validate web applications.
• Manager - Operating the Manager web app to deploy, undeploy, and redeploy applications while the app is running.
• Host Manager - Operating the Host Manager web app to add and remove virtual hosts while the app is running.
• Realms and Access Control - Description of how to configure Realms (databases of users, passwords, and their associated roles) for use in web applications that utilize Container Managed Security.
• Security Manager - Configuring and using a Java Security Manager to support fine-grained control over the behavior of your web applications.
• JNDI Resources - Configuring standard and custom resources in the JNDI naming context that is provided to each web application.
• JDBC DataSource - Configuring a JNDI DataSource with a DB connection pool. Examples for many popular databases.
• Classloading - Information about class loading in the software, including where to place your application classes so that they are visible.