"lein run"을 이용하여 (read-line) 함수를 사용하는 중에 문제가 발생하였다.
(read-line) 함수는 (. (new java.util.Scanner (. System in)) nextLine)]와 동일하다.
문제의 원인은 leiningen은 새로운 프로세스를 생성하여 사용하므로 사용자 콘솔에 접근을 할 수 없다는 문제이다.
ref : http://stackoverflow.com/questions/7707558/clojure-read-line-doesnt-wait-for-input
Try "lein trampoline run". See
Q: I don't have access to stdin inside my project. A: There's a problem in the library that Leiningen uses to spawn new processes that blocks access to console input. This means that functions like read-line will not work as expected in most contexts, though the repl task necessarily includes a workaround. You can also use the trampoline task to launch your project's JVM after Leiningen's has exited rather than launching it as a subprocess.