I have a mix app (elixir-1.9.4) that works when called as:

iex -S mix

It performs queries to an oracle db. Results are fine.

When I assemble a release and start it with:

MIX_ENV=prod mix release
_build/prod/rel/stomp/bin/stomp start

I hit a conversion issue:

:error, %DBConnection.ConnectionError{message: "[{:xmerl_ucs, :from_utf16be, [...]

I believe it is connected to non-ascii chars in some records (if a record is ascii-only all is good).
My env actually includes a LANG entry (LANG=en_GB.UTF-8), but neither

LANG=en_GB.UTF-8 _build/dev/rel/stomp/bin/stomp start 

I am aware it’s all pritty vague and I didn’t write any configuration file. But maybe it’s just me who forgot something really basic when I assembled the release that you can spot easily,

thank you,

francescm