If you put the following into a file and run it:
(defn new-listener [port]
(try (java.net.ServerSocket. port)
(println "Listening on " port)
(catch Exception e
(println "Failed to listen on port " port ":
" (.getMessage e)))))
(println "Server started")
(let [listener (new-listener 8888)]
(.accept listener))
Exception in thread "main" java.lang.NullPointerException (test.clj:0)
The problem is obviously my user code: new-listener should have
returned the socket it created. I'm just bringing it up because the
resulting exception doesn't have enough info to diagnose the problem.
Usually when there is an error the it displays the line number where
the problem occurred in the source. Is this a special case? I only
report it in the hope that such reports can help identify improvements
to error reporting.
Regards,
Tim.
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