Simple OTP Application error

Andrea Di Persio <>
Fri Jul 3 16:07:10 CEST 2009


Bingo!
I didn't compiled all the application file.

Now it work like a charm!


Thank you very much!

On Jul 2, 8:08 pm, Ulf Wiger <> wrote:
> The 'undef' part of the error means that erlang
> couldn't find the function hda_app:start/2.
>
> Check that your module has been compiled and is
> accessible via the code path.
>
> BR,
> Ulf W
>
>
>
>
>
> Andrea Di Persio wrote:
> > Hi!
>
> > I'm trying to build a simple otp application to dive deeper in erlang.
>
> > I'm following the example in Joe Armstrong 'Programmin Erlang'  and I
> > also tried with some example on the web but I can't make it work
> > correctly.
>
> > The application load correctly but when I run application:start
> > (appname) I get this error:
>
> > application: hda
> >     exited: {bad_return,
> >                 {{hda_app,start,[normal,[]]},
> >                  {'EXIT',
> >                      {undef,
> >                          [{hda_app,start,[normal,[]]},
> >                           {application_master,start_it_old,4}]}}}}
> >     type: temporary
> > {error,{bad_return,{{hda_app,start,[normal,[]]},
> >                     {'EXIT',{undef,[{hda_app,start,[normal,[]]},
> >                                     {application_master,start_it_old,
> > 4}]}}}}}
>
> > If I run the supervisor alone, it work correctly.
>
> > This is my   _app file:
>
> > -module(hda_app).
> > -behaviour(application).
> > -export([start/2, stop/1]).
>
> > start(_Type, _Args) ->
> >     hda_supervisor:start_link().
>
> > stop(_State) ->
> >     ok.
>
> > This is my .app file:
>
> > {application, hda,
> >  [{description, "Help Desk Assistant"},
> >   {vsn, "1.0"},
> >   {modules, [hda_app, hda_supervisor, customer_server,
> > hda_alarm_handler]},
> >   {registered, [customer_server]},
> >   {applications, [kernel, stdlib, sasl]},
> >   {mod, {hda_app, []}}
> >  ]}.
>
> > This is my supervisor:
>
> > -module(sellaprime_supervisor).
> > -behaviour(supervisor). % see erl -man supervisor
>
> > -export([start/0, start_in_shell_for_testing/0, start_link/1, init/
> > 1]).
>
> > start() ->
> >     spawn(fun() ->
> >             supervisor:start_link({local,?MODULE}, ?MODULE, _Arg =
> > [])
> >     end).
>
> > start_in_shell_for_testing() ->
> >     {ok, Pid} = supervisor:start_link({local,?MODULE}, ?MODULE, _Arg =
> > []),
> >     unlink(Pid).
>
> > start_link(Args) ->
> >     supervisor:start_link({local,?MODULE}, ?MODULE, Args).
>
> > init([]) ->
> >     %% Install my personal error handler
> >     gen_event:swap_handler(alarm_handler,
> >                            {alarm_handler, swap},
> >                            {my_alarm_handler, xyz}),
> >                            {ok, {{one_for_one, 3, 10},
>
> >     {ok, {{one_for_one, 3, 10},
> >           [{tag1,
> >             {customer_server, start_link, []},
> >              permanent,
> >              10000,
> >              worker,
> >              [customer_server]}
> >           ]}}.
>
> > Best regards,
> > Andrea.
>
> > ________________________________________________________________
> > erlang-questions mailing list. Seehttp://www.erlang.org/faq.html
> > erlang-questions (at) erlang.org
>
> --
> Ulf Wiger
> CTO, Erlang Training & Consulting Ltdhttp://www.erlang-consulting.com
>
> ________________________________________________________________
> erlang-questions mailing list. Seehttp://www.erlang.org/faq.html
> erlang-questions (at) erlang.org


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