Web Containers — 2 Technical Articles

Oct 29, 2025 · Backend Development

Why Spring Boot 4.0 Dropped Undertow Support and What It Means for Your Projects

Spring Boot 4.0 RC1 removes Undertow support because it cannot meet the Servlet 6.1 baseline, forcing developers to migrate web containers, and the article explains the technical reasons, new Servlet 6.1 features, Jakarta EE 11 changes, compatibility matrix, and migration guidance.

Backend MigrationJavaServlet 6.1

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Why Spring Boot 4.0 Dropped Undertow Support and What It Means for Your Projects

Lin is Dream

Mar 17, 2025 · Backend Development

How Web Containers Stay Alive: Inside Java Servlets, Netty, and Sockets

Web containers, such as Tomcat, keep running by continuously listening on network ports with socket servers and thread pools, handling I/O requests; this article explains the role of the main function, servlet lifecycle, Netty’s NIO framework, and why WebFlux‑based gateways outperform traditional Tomcat setups.

JavaNettyServlet

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How Web Containers Stay Alive: Inside Java Servlets, Netty, and Sockets