问题
I recently installed Erlang RFC4627 (JSON-RPC) with the debian package. I ran the test server using:
sudo erl -pa ebin
and then at the prompt:
test_jsonrpc:start_httpd().
returned
ok
I tested with http://:5671/ and got the success messages.
When I try to run rabbitmq-http2 however, I get the errors that the readme says are caused by rfc4627's code not being on the erlang search path. How do I put it on the path. I saw something on Dave Thomas's blog which suggested putting the path in the file:
~/.erlang
This didn't seem to work for me (maybe I did it wrong?).
回答1:
The code module is how you manipulate the path within an application.
The flags -pa that you used in starting the Erlang shell actually refer to a function in this module:
add_patha(Dir) -> true | {error, What}
You are right about the .erlang file in your home directory - it is run at start-up time of the shell and you can add in handy paths.
For an application you can start the shell with a batch file that calls something like this:
erl -pa ./ebin ../../lib/some/path/ebin
The flags behaviour of erl is described here.
For more sophisticated path management you need to get familiar with how OTP release management is done (but I suspect that is a while away for you yet).
来源：https://stackoverflow.com/questions/1236950/add-path-to-erlang-search-path