Posted by Alan Coopersmith on Mar 07

There are Java updates associated with security fixes on the quarterly
CPU cycle, but those aren’t the only Java updates – it is software under
active development after all, and releases new features too, not just
security patches.

http://www.oracle.com/technetwork/java/javase/overview/jdk-version-number-scheme-1918258.html
https://www.java.com/en/download/faq/release_dates.xml
http://openjdk.java.net/projects/jdk8u/