[CI] Add Java 21 compiling to J17 and native J21 #16672
Merged
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As we have implemented all changes that allow for Java 21 builds, I'd like to introduce it in the CI as well.
For full Java 21 support, we are still lacking a solution for changed serialization openhab/openhab-core#4174, which currently prohibits changing the JDK version of an existing installation.
This does not affect the build and test, so I propose to add 2 new build targets to the CI in addition to the existing Java 17 build:
This approach is already implemented and merged in openhab-core, see openhab/openhab-core#4186.
I have already tested this on my forked repo and rebased a few times to check if it works reliably.
https://github.com/holgerfriedrich/openhab-addons/actions