[erlang-questions] Debugging apps with dependencies

Josh Black <>
Mon Apr 30 21:00:00 CEST 2012


Excellent!  Thanks Tristan and Bob for the suggestions.  I'll try them out.  Is either one considered more idiomatic? 


On Monday, April 30, 2012 at 11:48 AM, Tristan Sloughter wrote:

> Correct about why you can't find appmon, but there is an easy way around this. Start the release yourself, you probably have to add your libs to ERL_LIBS first depending how how you have things setup. So like:
> 
> $ export ERL_LIBS=$ERL_LIBS:<path to dir with your compiled apps>
> $ erl -boot <path to boot file>
> 
> This will have your release running in your main erts env, not one created specifically for your release. 
> 
> Someone else can probably give better instructions based on where rebar places the libs and .boot file, I don't know those.
> 
> Tristan
> 
> On Mon, Apr 30, 2012 at 1:05 PM, Josh Black < (mailto:)> wrote:
> > Hi, erlang beginner here.
> > 
> > I have a question about the best way to debug apps which include dependencies.
> > 
> > I'm working on an app, and so far, I've been testing it by using rebar to generate a release, then starting a console for the release and going from there.  The problem comes when I want to use something like dbg or appmon to debug errors or inspect the state of my app.  When I try to do, e.g. appmon:start() from the console for my release, it tells me "undefined function appmon:start/0".  I'm guessing this is because I didn't explicitly specify appmon in my release configuration? 
> > 
> > Alternatively, I created a start.sh (http://start.sh) shell script with contents like this:
> > 
> > erl -pa apps/*/ebin -pa deps/*/ebin -eval 'application:start(dependency1), application:start(dependency2), application:start(myapp).' 
> > 
> > This lets me start appmon and whatever else I want when I run into errors, but feels pretty messy and wrong.
> > 
> > I feel like I'm missing something really obvious here.  What's the correct way to do this? 
> > _______________________________________________
> > erlang-questions mailing list
> >  (mailto:)
> > http://erlang.org/mailman/listinfo/erlang-questions
> > 
> 

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