Yes, OpenJDK is supported. With 10.14 Java 11 is required. Check out this KB article...

https://www.jamf.com/jamf-nation/articles/667/installing-java-and-mysql-for-jamf-pro-10-14-0-or-later

Hello,

Jamf currently supports open JDK 8. Jamf will add future support for open JDK 11.
If you want to learn more about oracle. please go through this link: https://mindmajix.com/oracle-ebs-training

Thanks & Regards,
Anita

Hello,

Oracle is now making major releases every six months. The current version (Java 10) is considered a short-term release whereas the next version release (Java 11) in September 2018 will be a long-term release. Long term releases get 3 year support (maybe longer) according to Oracle. The reason I bring this up is because I'm wondering what Jamf is going to support going forward and what their recommendations are going to be.

Thanks & Regards,
Anita

@henryxyz you're needed in E.R.