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Scala app gets "App boot timeout" on Heroku


Looking around here for answers involving that error code, I have the following suggestions:

  • Make sure you can start your app locally with foreman start
  • Find out how to start an https/Jetty app on a different port (I haven't used it)
    • (As an example, I'll use what works for Play2, which is setting http.port)
  • Edit your Procfile, appending an http.port argument that uses $PORT like this:

web: target/universal/stage/bin/myappname -Dhttp.port=$PORT

I suspect that without this port-setting argument, your webapp is starting on a different port to the one Heroku is checking for, hence the timeout.


Categories : Scala

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