Tomcat vs. Netty: Comparing Modern Server Architectures for High-Concurrency Applications Modern applications are expected to do more than simply process HTTP requests. They need to support thousands—or even millions—of concurrent connections, deliver real-time communication, maintain low latency, and operate reliably across distributed and cloud-native environments. Applications such as messaging platforms, streaming services, API gateways, and real-time systems have pushed server architecture toward increasingly efficient concurrency and networking models. This raises an important question for Java developers: Does the traditional servlet-based server model still provide the right foundation for modern applications, or should developers consider event-driven networking frameworks such as Netty? The answer is not as simple as choosing one technology over another. Tomcat and Netty are built around different architectural models , and modern Java has introduced new capabilities—includin...