Hi,
There are some open issues about this:
https://issues.apache.org/jira/browse/OFBIZ-10757 - jdk 11
https://issues.apache.org/jira/browse/OFBIZ-12399 - jdk 17
https://issues.apache.org/jira/browse/OFBIZ-12400 - gradle 7.x for jdk17
There is also a PR for gradle upgrade https://github.com/apache/ofbiz-framework/pull/354
Gradle upgrade is a pre-requisite for JDK upgrade.
I remember some issues with project not generating some docs as part of build on some system.
I think this should not be considered an upgrade blocker IMO.
Since we are using third party libraries that might not support all platforms.
I really hope this gets merged.
Regads,
Eugen