Correct usage of Environ library in profiles

I have a question regarding of the usage of profiles and environment variables. Is it possible to export variables with environ depending on the which profile is set? This is what I have tried (partial project.clj)

  :env {:time-to-wait-for-response "72" ; in hours
        :crm-address "https://app.onepagecrm.com/api/v3/"}
:profiles
  {:uberjar {:omit-source true
             :aot :all}
   :uberwar {:omit-source true
             :aot :all}
   :prod {:ring {:open-browser? false 
                 :stacktraces? false 
                 :auto-reload? false}
         {:env {:prod? true
                :db-user "mailer"
                :db-password "" }}
   :dev  {:env {:db-user "mailer" 
                :db-password ""}

          :dependencies [[ring-mock "0.1.5"]
                        [ring/ring-devel "1.3.1"]
                        [midje "1.6.3"]]
          :ring {:open-browser? false}
          :plugins [[lein-midje "3.2.1"]]}})

However if I build the WAR file with lein ring uberwar(even with with-profile dev) and deploy it to Tomcat I will get db-user as nil (called with (env :db-user). However lein ring server correctly uses dev profile so it works. Is there something wrong I am doing? Or environ is not supposed to be used this way?

Solution

This reason it is not working as you expect is because you're only setting those variables when the profile is active. Once you have built a WAR file and deployed it, lein is no longer in the picture. You'll need to load these variables in a different way. If you want to stick with environ, the two options seem to be as Java system properties or environment variables.