The Master Controller and Apache Tomcat 9 (Admin Interface, Open Archive, Fews Web Services and Database HTTPS Proxy) are known to work with the OpenJDK 11 as distributed by RedHat).
NB. The 11.0.2 distribution contains bugs in the OpenJDK 11.0.2 SSL, which are known to occur specifically when setting up SSL encryption in Tomcat for the https database proxy. When SSL is not used, 11.0.2 is functionally usable.