Overview
Apache Tomcat is an open-source implementation of the Jakarta Servlet, Jakarta Expression Language, and Jakarta WebSocket technologies. As of 2026, it remains a cornerstone of the Java ecosystem, bridging the gap between legacy monolithic deployments and modern microservices architectures. Its technical architecture centers on the Catalina servlet engine and the Jasper JSP engine, providing a high-performance environment for Java code execution. In the 2026 market, Tomcat is increasingly deployed via lightweight OCI-compliant containers (Docker/Podman) and orchestrated through Kubernetes. It supports HTTP/2, HTTP/3 (via QUIC), and TLS 1.3 by default, ensuring security and speed for enterprise-grade web applications. Unlike full Java EE application servers like GlassFish or WildFly, Tomcat focuses on being a 'web profile' container, making it significantly more lightweight and faster to boot. Its extensive documentation and global community provide a robust framework for developers to move from local development to massive-scale production environments with minimal configuration drift.