Lean web application servers such as Tomcat have a clear advantage here in that they are not dependent on the specifics of any JDK version. Tomcat 8 has been tested against OpenJDK 8 for half a year already and is generally declared compatible with Java 8. Even Tomcat 7 joins that club, receiving an upgraded Eclipse compiler etc as well.
So Tomcat presents itself as immediate production-quality options for use with JDK 8.
But has anyone details on something that does not work with Casper 9.3?!