(defproject onyx-starter "0.1.0-SNAPSHOT"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.7.0"]
                 [org.clojure/core.async "0.1.346.0-17112a-alpha"]
                 [org.onyxplatform/onyx "0.8.0"]
                 [com.stuartsierra/component "0.2.3"]]
  :profiles {:dev {:dependencies [[org.clojure/tools.namespace "0.2.10"]]
                   :source-paths ["env/dev" "src"]}})

(defproject onyx-starter "0.1.0-SNAPSHOT"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :dependencies [[org.clojure/clojure "1.7.0"]
                 [org.onyxplatform/onyx "0.8.1"]
                 [com.stuartsierra/component "0.2.3"]]
  :profiles {:dev {:dependencies [[org.clojure/tools.namespace "0.2.10"]]
                   :source-paths ["env/dev" "src"]}})

Upgrade onyx-starter to 0.8.1. Remove conflicting core.async dependency
Upgrade onyx-starter to 0.8.1.
Remove conflicting core.async dependency

onyx-platform/onyx-starter