Hi there, so Java 11 GA is out, get it from <http://jdk.java.net/11/>.
Jackrabbit Oak trunk compiles and tests with Java 11 (but is still supposed to support Java 8).
The latest stable branch (1.8) does not yet - this is because we haven't decided yet about the best way to deal with the nullability annotation issue (see <https://issues.apache.org/jira/browse/OAK-7669> and chime in if you have preference).
Best regards, Julian
