Apache Tomcat

Apache Tomcat is an open-source implementation of Java Servlets, JavaServer Pages, Java Expression Language, and Java WebSocket technologies. Apache Tomcat software runs many large-scale, mission-critical online applications in a variety of industries and organizations. It is meant to be a global collaboration of top-tier developers.

Features and Highlights

• Deployer - Use the Tomcat Deployer to deploy, precompile, and test web applications. 
• Manager - Use the Manager web app to deploy, uninstall, and reinstall programs while they are running. 
• Host Manager - Use the Host Manager web interface to add and remove virtual hosts while it is operating. 
• Realms and Access Control - This section describes how to configure Realms (databases of users, passwords, and associated roles) for usage in web applications using Container Managed Security. 
• Security Manager - Setting up and using a Java Security Manager to provide fine-grained control over the behavior of your online applications. 
• JNDI Resources - Setting up standard and bespoke resources in the JNDI naming context given by each web application. 
• JDBC DataSource - Setting up a JNDI DataSource with a database connection pool. Examples of numerous prominent databases. 
• Classloading - Information regarding class loading in software, such as where to place your application's classes so they are visible. 
• JSPs - Information on Jasper settings and JSP compiler usage. 
• SSL/TLS - Installing and configuring SSL/TLS support so that Tomcat may serve requests over the HTTP protocol. 
• SSI - Using Server Side Includes in the application. 
• CGI - Using CGIs in the app. 
• Proxy Support - Setting up the app to run behind a proxy server (or a web server that acts as a proxy server). 
• MBeans Descriptors - Setting up MBean descriptor files for bespoke components. 
• Default Servlet - Setting up the default servlet and changing directory listings. 
• Clustering: Enable session replication in the environment. 
• Balancer - Setting up, utilizing, and extending the load balancer application. 
• Connectors include app-specific connectors as well as native web server integration. 
• Monitoring and management entails enabling JMX Remote support and utilizing tools to monitor and manage Apache Tomcat. 
• Logging - Setting up logging in the software. 
• Apache Portable Runtime (APR) - APR improves performance, scalability, and interoperability with native server technologies. 
• Virtual Hosting - Setting up virtual hosting in Tomcat. 
• Advanced IO - Extensions for normal, blocking IO. 
• Additional Components – Obtaining additional and optional components. 
• Using libraries with Maven - Obtaining Tomcat jars with Maven. 
• Security Considerations - Options for securing an installation. 
• Windows Service - Runs the program as a service under Microsoft Windows. 
• Windows Authentication - Set up the program to use integrated Windows authentication. 
• High Concurrency JDBC Pool - Configuring the program to utilize a different JDBC pool. 
• WebSocket support - Create WebSocket applications for Tomcat. 
• URL rewriting - The regexp-based rewrite valve is used for conditional URL and host rewrites. 
• Configuring CDI, JAX-RS, and Eclipse Microprofile support.

Note: Requires Java Runtime Environment.