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<H1>[99s-extend] Getting started error: behaviour cowboy_http_handler undefined</H1>
<B>Loïc Hoguin</B>
<A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20Getting%20started%20error%3A%20behaviour%0A%20cowboy_http_handler%20undefined&In-Reply-To=%3C5320F1F1.9000506%40ninenines.eu%3E"
TITLE="[99s-extend] Getting started error: behaviour cowboy_http_handler undefined">essen at ninenines.eu
</A><BR>
<I>Thu Mar 13 00:46:57 CET 2014</I>
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<PRE>It's explained here: <A HREF="http://www.erlang.org/doc/man/code.html">http://www.erlang.org/doc/man/code.html</A>
I am not sure why it caused issues on your system, possibly Erlang
ignored it because there was an invalid folder in there. I don't really
know.
On 03/13/2014 12:43 AM, <A HREF="https://lists.ninenines.eu/listinfo/extend">lloyd at writersglen.com</A> wrote:
><i> Hi,
</I>><i>
</I>><i> That fixed it!
</I>><i>
</I>><i> But where can I go to understand why and prevent it in future?
</I>><i>
</I>><i> I've googled ERL_LIBS, but not found much enlightenment. Should there possibly be a note in Cowboy docs? Or is this something idiosyncratic to my system?
</I>><i>
</I>><i> Many thanks!
</I>><i>
</I>><i> Lloyd
</I>><i>
</I>><i> -----Original Message-----
</I>><i> From: "Loïc Hoguin" <<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>>
</I>><i> Sent: Wednesday, March 12, 2014 6:57pm
</I>><i> To: <A HREF="https://lists.ninenines.eu/listinfo/extend">lloyd at writersglen.com</A>
</I>><i> Cc: <A HREF="https://lists.ninenines.eu/listinfo/extend">extend at lists.ninenines.eu</A>
</I>><i> Subject: Re: [99s-extend] Getting started error: behaviour cowboy_http_handler undefined
</I>><i>
</I>><i> Can you try again after running "unset ERL_LIBS"?
</I>><i>
</I>><i> On 03/12/2014 11:51 PM, <A HREF="https://lists.ninenines.eu/listinfo/extend">lloyd at writersglen.com</A> wrote:
</I>>><i> Hi Loïc,
</I>>><i>
</I>>><i> Thanks for help.
</I>>><i>
</I>>><i> I'm running cowboy master from GitHub and Erlang R16B02.
</I>>><i>
</I>>><i> $ echo $ERL_LIBS
</I>>><i>
</I>>><i> ...gives me a directory that no longer exists; don't know how it got there, what it should be, or how to change it.
</I>>><i>
</I>>><i> E.g.: /home/lloyd/Programming/Erlang/zippity/apps
</I>>><i>
</I>>><i> I've looked in .erlang and tried $ export ERL_LIBS=<my path to hello_erlang/ebin>.
</I>>><i>
</I>>><i> Thanks again,
</I>>><i>
</I>>><i> LRP
</I>>><i>
</I>>><i> -----Original Message-----
</I>>><i> From: "Loïc Hoguin" <<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>>
</I>>><i> Sent: Monday, March 10, 2014 4:36pm
</I>>><i> To: <A HREF="https://lists.ninenines.eu/listinfo/extend">lloyd at writersglen.com</A>, <A HREF="https://lists.ninenines.eu/listinfo/extend">extend at lists.ninenines.eu</A>
</I>>><i> Subject: Re: [99s-extend] Getting started error: behaviour cowboy_http_handler undefined
</I>>><i>
</I>>><i> Try updating Erlang or Cowboy, this isn't the first time this happens
</I>>><i> and I fixed something at some point.
</I>>><i>
</I>>><i> Also see if you have ERL_LIBS already defined, in which case there might
</I>>><i> be a bug in Cowboy.
</I>>><i>
</I>>><i> On 03/10/2014 08:44 PM, <A HREF="https://lists.ninenines.eu/listinfo/extend">lloyd at writersglen.com</A> wrote:
</I>>>><i> Hello,
</I>>>><i>
</I>>>><i> I've slavishly emulated the "Getting started" example in the guide:
</I>>>><i>
</I>>>><i> <A HREF="http://ninenines.eu/docs/en/cowboy/HEAD/guide/getting_started/">http://ninenines.eu/docs/en/cowboy/HEAD/guide/getting_started/</A>
</I>>>><i>
</I>>>><i> But, when I compile I get this error:
</I>>>><i>
</I>>>><i> yada yada
</I>>>><i> ERLC hello_erlang_app.erl hello_handler.erl hello_erlang_sup.erl
</I>>>><i> compile: warnings being treated as errors
</I>>>><i> src/hello_handler.erl:2: behaviour cowboy_http_handler undefined
</I>>>><i> make: *** [ebin/hello_erlang.app] Error 1
</I>>>><i>
</I>>>><i> Cowboy seems to be correctly loaded and compiled as a dependency. I can see .../cowboy/ebin/cowboy_http_handler.beam
</I>>>><i>
</I>>>><i> However, when I remove the line -behavior(cowboy_http_handler) from hello_handler.erl, system compiles and creates release just fine.
</I>>>><i>
</I>>>><i> % -behavior(cowboy_http_handler).
</I>>>><i>
</I>>>><i> Could this be a bug in Getting started or some dunder-headed thing on my end?
</I>>>><i>
</I>>>><i> Thanks,
</I>>>><i>
</I>>>><i> LRP
</I>>>><i>
</I>>>><i>
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</I>>><i>
</I>><i>
</I>
--
Loïc Hoguin
<A HREF="http://ninenines.eu">http://ninenines.eu</A>
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