Tim not sure if you saw Oracles new commercial licence but I assume that means users will probably exclusively use OpenJDK from here on out.  Not sure what that means for development but its not a contractual breach to use Oracle's JDK in production without paying for it.

`You may not: use the Programs for any data processing or any commercial, production, or internal business purposes other than developing, testing, prototyping, and demonstrating your Application.`

Cheers

Ben