Java Backend Technology

Jan 27, 2026 · Backend Development

Zero‑Downtime Spring Boot Deployment: Sharing a Single Port Across Versions

This article explains how to update a Spring Boot application without stopping the service by allowing two processes to share the same port, detailing the underlying Tomcat embedding, DispatcherServlet handling, and providing step‑by‑step code and a live demo to achieve seamless zero‑downtime deployments.