Previously, there were some questions raised on the JSON-P 1.1 (JSR 374 for Java EE 8) API and how it will correlate/co-exist to/with the JSON API in OpenJDK (which of course would have made its way into Java SE 9). But I guess that closed for now!
Check out the excerpts of the discussion here on the Java EE 8 EG mailing list
Cheers. . . !