You could choose to run the maintenance branch: GeoServer 2.22.4 is still
compatible with Java 8 at this time; however it will reach end-of-life in
September:
-
https://docs.geoserver.org/maintain/en/user/installation/index.html#installation
Next week is the Bolsena Code Sprint, Java 11
Geoserver is compatible with Java-11. However, Geonetwork is compatible
with Java-8. Is there a set of versions for Java, Geoserver, and
Geonetwork, compatible with each other?
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Please make sure you read the following two