Tomcat

How It Works

Apache Tomcat runs as a long-lived Java process (JVM) that listens for incoming requests and routes them to deployed web applications. Applications are packaged as WAR files or deployed as exploded directories, and Tomcat loads them using classloaders, initializes servlets, and manages their lifecycle. It implements the Servlet and JSP specifications (now under the Jakarta namespace), enabling dynamic page rendering, request/response processing, filters, and session handling.

In many production setups, Tomcat sits behind a front-end web server or reverse proxy such as Nginx or Apache HTTP Server. The proxy terminates TLS, serves static assets efficiently, and forwards dynamic requests to Tomcat over HTTP or AJP (where supported and secured). Administrators tune JVM memory, thread pools, connection settings, and logging, and they may run multiple Tomcat instances for isolation or scale, often managed by systemd, containers, or orchestration tools.

Why It Matters for Web Hosting

Tomcat affects which hosting plans can run your application and how it will perform under load. If your site or API is Java-based, you need a plan that supports a JVM, persistent background processes, and the ability to deploy WAR files and configure ports, environment variables, and memory limits. When comparing hosts, look for Tomcat version availability, reverse-proxy support, access level (shared vs VPS/dedicated), restart controls, and monitoring options to avoid resource contention and deployment friction.

Common Use Cases

• Hosting Java web applications built with Servlets and JSP
• Running Spring-based web apps and REST APIs packaged as WAR files
• Serving internal business tools, dashboards, and admin portals
• Deploying lightweight Jakarta EE components without a full Java EE application server
• Providing an application runtime behind Nginx/Apache for TLS termination and static file delivery

Tomcat vs Jetty

Tomcat is a full-featured servlet container commonly used as a standalone application server, with mature tooling, broad documentation, and a traditional deployment model centered on WAR files and server configuration. Jetty is often chosen as an embeddable web server within Java applications, making it popular for self-contained services and frameworks that start the server from code. For hosting decisions, Tomcat is more frequently offered as a managed runtime, while Jetty is more commonly bundled inside custom deployments where you control the entire stack.