[erlang-questions] OTP error: bad_return

[Francesco Cesarini]

It is the return value which is not what the supervisor expects. It should be

{ok, {RestartStrategy, ChildList}}, you are sending {ok, RestartStrategy, ChildList}

F



> On 14 Jun 2014, at 19:08, Ben Hsu <benhsu@REDACTED> wrote:
> 
> 
> Hello,
> 
> I am trying to put my application under an OTP supervisor, and I'm seeing an error message I don't understand when I start my application using "application:start(app_name)".
> 
> The error says "bad_return", and I'm not sure if it means the tuple I'm returning from init/1 is bad, or if my code is bad.
> 
> My supervisor code, which I took verbatim from the OTP book, looks like this:
> 
> start_link() ->
> 		supervisor:start_link({local, ?SERVER}, ?MODULE, []).
> 
> init([]) ->
>     Server = {stats_gatherer, {stats_gatherer, start_link, []},
>               permanent, 2000, worker, [stats_gatherer]},
> 		Children = [Server],
> 		RestartStrategy = {one_for_one, 0, 1},
> 		{ok, RestartStrategy, Children}.
> 
> 
> I tried running stats_gatherer:start_link() from the Erlang shell, and it worked.
> 
> The error message is below. I would be grateful for any insight.
> 
> 1> application:start(stats_app).
> {error,
>     {{error,
>          {bad_return,
>              {stats_sup,init,
>                  {ok,{one_for_one,0,1},
>                      [{stats_gatherer,
>                           {stats_gatherer,start_link,[]},
>                           permanent,2000,worker,
>                           [stats_gatherer]}]}}}},
>      {stats_app,start,[normal,[]]}}}
> 
> =INFO REPORT==== 14-Jun-2014::14:03:19 ===
>     application: stats_app
>     exited: {{error,
>                  {bad_return,
>                      {stats_sup,init,
>                          {ok,{one_for_one,0,1},
>                              [{stats_gatherer,
>                                   {stats_gatherer,start_link,[]},
>                                   permanent,2000,worker,
>                                   [stats_gatherer]}]}}}},
>              {stats_app,start,[normal,[]]}}
>     type: temporary
> 
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