This is a well-known Log4j issue (but don't worry, this is only a
warning not an error). See here:

http://www.avajava.com/tutorials/lessons/how-do-i-initialize-log4j-in-a-web-application.html

http://www.avajava.com/tutorials/lessons/what-is-log4j-and-how-do-i-use-it.html

The easiest way to initialize Log4j is to execute this on REPL before
running (labrepl/-main):

(org.apache.log4j.BasicConfigurator/configure)

However, from what the output looks like you are already all set up.
You can go to the browser and invoke http://localhost:8080 (or
whatever is the port number).

Regards,
Shantanu

On Jul 24, 9:58 am, Victor S <victor.s...@gmail.com> wrote:
> Well so far it works, I'm just confused by some of these java
> errors...
>
> - V
>
> On Jul 23, 7:26 am, Laurent PETIT <laurent.pe...@gmail.com> wrote:
>
>
>
> > And may I add that "crazy easy labrepl installation for ccw" is around the
> > corner:http://github.com/smuehlst/ccw/tree/labrepl-sample-project!
>
> > 2010/7/23 Victor S <victor.s...@gmail.com>
>
> > > I finally got labrepl to work with one IDE, tried with intelliJ but
> > > didnt work, also comand line didnt work on mac os x. But Eclipse
> > > version seems to work! Yay!
>
> > > So I can't wait to start learning more about Clojure, but the road so
> > > far is pretty bumpy... Any help in figuring out what this log4j error
> > > is? Consider I'm a complete beginner at all the java jargon, and
> > > there's plenty!
>
> > > 1:2 user=> (labrepl/-main)
> > > 2010-07-23 00:57:38.015::INFO:  Logging to STDERR via
> > > org.mortbay.log.StdErrLogsolutions.mini_browser.proxy
> > > $javax.servlet.http.HttpServlet$0
>
> > > 2010-07-23 00:57:38.035::INFO:  jetty-6.1.21
> > > labrepl.proxy$javax.servlet.http.HttpServlet$0
> > > 2010-07-23 00:57:38.155::INFO:  Started socketconnec...@0.0.0.0:9000
> > > 2010-07-23 00:57:38.156::INFO:  jetty-6.1.21
> > > 2010-07-23 00:57:38.160::INFO:  Started socketconnec...@0.0.0.0:8080
> > > Welcome to the labrepl. Browse to localhost:8080 to get started!
> > > nil
> > > 1:3 user=> log4j:WARN No appenders could be found for logger
> > > (labrepl).
> > > log4j:WARN Please initialize the log4j system properly.
>
> > > So far, the site is accessible and things seem fine. Maybe I'm asking
> > > about this error preemptively...
> > > I have also posted this question on the labrepl github page as an
> > > issue.
>
> > > - V
>
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