Two ideas:

1. OpenJDK 8 is available as a “technology preview” for CentOS 6.6, or so this article claims http://news.softpedia.com/news/CentOS-6-6-Features-OpenJDK-8-Support-463730.shtml

2. Since Oracle Linux is userland-binary compatible with RHEL and CentOS, I
think you will eventually surely get a build by Oracle for OL7 that you can run in your CentOS if you want.

Of course #2 is only wishful thinking on my part.

Just my $0.02 of course. FC