[Proposal] Design #126: Propose the upgrade kroxylicious-junit5-extension JDK to Java 21

[Keith W]

(reposted as new thread to correct subject line error).

Hey all,

There's a proposal raised to upgrade the kroxylicious-junit5-extension from a minimum Java version of 17 to  Java 21.

https://github.com/kroxylicious/design/pull/126

If you use the kroxylicious-junit5-extension as a dependency in your project, this may affect you.

Note: that the main kroxylicious project already requires Java 21.

This was proposed by 

https://github.com/kroxylicious/design/blob/main/proposals/013-upgrade-project-jdk-to-java-21.md and was realised as part of the 0.22.0 release https://kroxylicious.io/blog/kroxylicious-proxy/releases/2026/07/03/release-0_22_0.html