just for info

Spring Boot now supports Jetty 12. Jetty 12 supports the Servlet 6.0 API, aligning it with both Tomcat and Undertow. Previously, if you were using Jetty with Spring Boot 3.x, the Servlet API had to be downgraded to 5.0. This is no longer necessary. Remove any override of the Servlet API version when upgrading.

Due to significant API differences between Jetty 11 and Jetty 12, Jetty 11 is no longer supported as an embedded web server.