This guide walks you through setting up a Jakarta EE project, configuring Maven and WildFly, adding security constraints and login settings in web.xml, defining users and roles, and testing basic authentication with curl to protect a simple RESTful endpoint.
Spring Boot 4.0’s release removes support for the Undertow web container due to incompatibility with the new Servlet 6.1 baseline, prompting developers to migrate to other containers; this article examines the technical reasons, Servlet 6.1 enhancements, Jakarta EE 11 standards, and compatibility across major servers.
This practical guide walks you through every stage of upgrading a Spring Boot 2.x application to 3.x, covering pre‑migration preparation, dependency changes, code refactoring, security configuration updates, configuration file adjustments, third‑party library compatibility, common pitfalls, verification steps, and optional native image building.
The article outlines the upcoming Spring Boot 3.0 milestone, highlighting major changes such as removal of deprecated APIs, a minimum Java 17 requirement, migration to Jakarta EE 9, discontinued support for several libraries, and offers practical advice for developers planning the upgrade.
