Simple OTP Application error
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Simple OTP Application error
by andrea.dipersio
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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. See http://www.erlang.org/faq.html erlang-questions (at) erlang.org |
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Re: Simple OTP Application error
by Ulf Wiger-3
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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. See http://www.erlang.org/faq.html > erlang-questions (at) erlang.org > -- Ulf Wiger CTO, Erlang Training & Consulting Ltd http://www.erlang-consulting.com ________________________________________________________________ erlang-questions mailing list. See http://www.erlang.org/faq.html erlang-questions (at) erlang.org |
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Re: Simple OTP Application error
by andrea.dipersio
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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 <ulf.wi...@...> 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 ________________________________________________________________ erlang-questions mailing list. See http://www.erlang.org/faq.html erlang-questions (at) erlang.org |
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