Hello, I'm happy to let you know that we are currently in the process of getting a build matrix into place that will support OpenJDK 9b124 for Ratpack ( https://ratpack.io). We currently build against 8u51. We'd be privileged to be mentioned on the Quality Outreach page ( https://wiki.openjdk.java.net/display/quality/Quality+Outreach).
Cheers, Dan Woods @danveloper