Somebody said it is difficult to upgrade JDK 1.7 yo 1.8 on mac and you can not trust Oracle.
I want to say this is not true.
it is very easy to update JDK 1.7 yo 1.8 on mac.
You just need to download and install, it doesn't impact/conflict your old version.
Go to this page to download:
then it will appear here: