Issues like https://issues.jenkins-ci.org/browse/JENKINS-54426 are arising so it would be better to add the module upstream.
Jenkinsfile Runner fails on Java 11: NoClassDefFoundError: java.sql.Date
One small comment. Should we perform a full survey of code detached to modules? There may be other modules we may need to add
I think that might have been already done as part of JDK 11 works?
After discussing with the Java11 support group we recognize that this issue comes from a special usage just like the one in PCT. So we will close this issue and if and only if it manifests in core components or plugins, we will fix it upstream