Check the type of `port'. Seems like arguments from the command line gets passed as strings. You need to convert them to a number:
(Integer. port-string) Cheers, Moritz larry google groups writes: > So, this started when I read Keith Swallow's article on a simple web server: > > http://keithcelt.com/a-simple-web-server-in-clojure > > I took his code and ran "lein new" to create a new project and I copy and > pasted his code to core.clj and made some minor adjustments, adding > gen-class and main so I could run this from the command line. My main > function looked like this: > > (defn -main [& args] > (let [port (Integer/parseInt (first args))] > (println "Server is starting") > (run-server port echo))) > > Which called his function: > > (defn run-server [port service] > (let [server-socket (create-socket port)] > (while (not (. server-socket isClosed)) > > (listen-and-respond server-socket service)))) > > I compiled that and ran "lein uberjar" and then ran it from the command > line and it worked great. > > Then, to make it slightly more flexible, I wanted to hand in the name of > the service from the command line. So I made a minor change: > > > (defn run-server [port what-to-do] > (let [server-socket (ServerSocket. "localhost" port)] > (while (not (. server-socket isClosed)) > (listen-and-respond server-socket what-to-do)))) > > (defn -main [& args] > (let [port (Integer/parseInt (first args)) > service (second args)] > (println "Server is starting") > (println "port: " port) > (println "service: " service) > (run-server port service))) > > I compiled this and ran it. And now this line: > > (defn run-server [port what-to-do] > > Gets this error: > > Exception in thread "main" java.lang.ClassCastException: java.lang.String > cannot be cast to java.lang.Number > at who_is_logged_in.core$run_server.invoke(core.clj:27) > > I'm calling it from the command line with: > > java -jar who-is-logged-in-1.0.0-SNAPSHOT-standalone.jar 3456 > who-is-here-now > > I also tried putting the service name in quotes: > > java -jar who-is-logged-in-1.0.0-SNAPSHOT-standalone.jar 3456 > "who-is-here-now" > > Can anyone tell me what is wrong? Why does Clojure think I'm trying to cast > "who-is-here-now" to a number? -- Moritz Ulrich -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
