I'm having an issue trying to get nginx-clojure to work with Hikari-CP. The problem is that when the jar runs behind nginx-clojure I get AbstractMethodError on connection.isValid() which would seem to indicated that my MySQL driver is outdated and does not support JDBC4 API. However, I'm using the most recent MySQL driver and my code runs perfectly fine without nginx-clojure. I cannot seem to figure out why and how nginx-clojure is causing this issue for me.