How to print to the REPL window in a Ring handler?

Question

(defn app [request]
  (println "test")
  {:body "Hello World"})

(defonce server (run-jetty #'app {:port 8080 :join? false}))

println doesn't seem to work in a handler. How do I write to the REPL window?

I'm using eclipse with counterclockwise.

EDIT: This looks like nrepl issue. (future (println "foo")) is fine, but no output with (.start (Thread. #(println "foo"))).

Answer 1

println doesn't write to output directly, rather it buffers the output and flush it later. You can try (.println System/out "test")

Answer 2

You can find the outputin the *nrepl-server ...* buffer for your project. In CIDER, this buffer is hidden. You can find it with C-x C-b though.