This upgrade from io.undertow:undertow-core version 2.2.13.Final to 2.3.21.Final is a high-risk migration due to a fundamental change in the underlying Java EE APIs.

Key Breaking Change: Jakarta EE 10 Migration

The primary breaking change in the 2.3.x series is the migration from the javax.* namespace to the jakarta.* namespace. This was done to support Jakarta EE 10, including Jakarta Servlet 6.0 and Jakarta WebSocket 2.1. Any application code that uses Undertow and references classes from the javax.servlet.* or javax.websocket.* packages will fail to compile and run without modification.

Recommendation:
Before upgrading, developers must perform a full source code migration from javax.* to jakarta.* namespaces. This is a significant effort that requires careful code changes and thorough testing. The maintainers explicitly state that projects needing to remain on the javax namespace should continue using the 2.2.x versions.

• Action Required: Refactor all application code, including imports and class references, from javax.* to the corresponding jakarta.* packages.

Source: Undertow 2.3.0.Final Release Announcement

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