This issue is for ongoing java maintenance such e.g. new releases.
FL-7279 Can't install www-servers/tomcat-9 because of dependent package failures
FL-10406 dev-java/openjdk-11.0.16.1_p1 adds -O3 regardless of CFLAGS/CXXFLAGS
FL-8619 dev-java/oracle-jdk-bin and oracle-jre-bin can be autogenned