JavaGuide
Oct 30, 2025 · Backend Development
Why Spring Boot 4.0 Dropped Support for Undertow
Spring Boot 4.0 removes Undertow because it cannot meet the Servlet 6.1 baseline, leading to build failures for projects that depend on spring-boot-starter-undertow, and the article analyzes the technical reasons, compatibility matrix, and lessons for future web‑container selection.
Spring Bootbackend-migrationjakarta-ee
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