lein ring server doesn't call

project-stuff.clj

;;
;; My project.clj file:
;;
(defproject my-server/my-server "0.0.1"
  :description "My REST API"
  :dependencies [[org.clojure/clojure "1.4.0"]
                 [org.clojure/java.jdbc "0.2.1"]
                 [org.clojure/data.xml "0.0.3"]
                 [slingshot "0.10.2"]
                 [ring "1.1.1"]
                 [ring-json-params "0.1.3"]
                 [compojure "1.1.0"]
                 [org.webbitserver/webbit "0.2.0"]
                 [clj-json "0.5.0"]
                 [clj-record "1.1.1"]
                 [clj-time "0.4.3"]
                 [mmemail "1.0.2"]
                 ;[clojureql "1.0.3"]
                 [mysql/mysql-connector-java "5.1.20"]
                 [org.clojure/tools.logging "0.2.3"]
                 [log4j "1.2.15"
                  :exclusions [javax.mail/mail
                               javax.jms/jms
                               com.sun.jdmk/jmxtools
                               com.sun.jmx/jmxri]]]
  :dev-dependencies [[lein-ring "0.5.4"]
                     [ring-serve "0.1.1"]]
  :min-lein-version "2.0.0"
  :ring {:handler my.core/boot})

;;
;; my/core.clj file:
;;

; [...]

;; Compojure routes
(defroutes api-routes
  ; [etc...]
)

(defn api []
  (-> api-routes
    wrap-params
    wrap-error-handling
    ring-params/wrap-params))

(defn boot [& boot-args]
  (dbg boot-args)
  (config/init)
  (websocket/init)
  (println "http-port: " config/http-port)
  ; In config.clj, http-port is (def http-port 8080)
  (run-jetty api {:port config/http-port}))

;; When I do a 'lein ring server-headless' then core/boot isn't called (there's no output
;; from (dbg boot-args) or the (println)). Jetty starts on port 3000