Problem when starting Phoenix app under umbrella

dmarko484 · March 6, 2018, 2:44pm

I’m following this article https://medium.com/@brucepomeroy/create-an-elixir-umbrella-project-containing-a-phoenix-app-and-build-a-release-with-distillery-46371f2617df, step by step …

a) created umbrella app and switched to ‘apps’ directory
b) created phoenix app under umbrella
c) created mix app under umbrella

… all based on tutorial above. Now when I got back to umbrella root directory and run

iex -S mix phoenix.server

i’m getting error as below. Any idea whats wrong here? I tried these few steps several times with the same error. I’m using Elixir 1.6.2 and Phoenix 1.3.1

[error] GenServer Phoenix.CodeReloader.Server terminating                                                                                      
** (RuntimeError) trying to access Mix.Project.app_path for an umbrella project but umbrellas have no app                                      
    (mix) lib/mix/project.ex:486: Mix.Project.app_path/1                                                                                       
    (phoenix) lib/phoenix/code_reloader/server.ex:28: Phoenix.CodeReloader.Server.handle_call/3                                                
    (stdlib) gen_server.erl:636: :gen_server.try_handle_call/4                                                                                 
    (stdlib) gen_server.erl:665: :gen_server.handle_msg/6                                                                                      
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3                                                                                     
Last message (from ChatWeb.Endpoint): :check_symlinks                                                                                          
State: false                                                                                                                                   
Client ChatWeb.Endpoint is alive                                                                                                               
    (stdlib) gen.erl:169: :gen.do_call/4                                                                                                       
    (elixir) lib/gen_server.ex:831: GenServer.call/3                                                                                           
    (phoenix) lib/phoenix/endpoint/supervisor.ex:62: Phoenix.Endpoint.Supervisor.init/1                                                        
    (stdlib) supervisor.erl:294: :supervisor.init/1                                                                                            
    (stdlib) gen_server.erl:365: :gen_server.init_it/2                                                                                         
    (stdlib) gen_server.erl:333: :gen_server.init_it/6                                                                                         
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3                                                                                     
                                                                                                                                               
[info] Application chat_web exited: ChatWeb.start(:normal, []) returned an error: shutdown: failed to start child: ChatWeb.Endpoint            
    ** (EXIT) exited in: GenServer.call(Phoenix.CodeReloader.Server, :check_symlinks, :infinity)                                               
        ** (EXIT) an exception was raised:                                                                                                     
            ** (RuntimeError) trying to access Mix.Project.app_path for an umbrella project but umbrellas have no app                          
                (mix) lib/mix/project.ex:486: Mix.Project.app_path/1                                                                           
                (phoenix) lib/phoenix/code_reloader/server.ex:28: Phoenix.CodeReloader.Server.handle_call/3                                    
                (stdlib) gen_server.erl:636: :gen_server.try_handle_call/4                                                                     
                (stdlib) gen_server.erl:665: :gen_server.handle_msg/6                                                                          
                (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3                                                                         
** (Mix) Could not start application chat_web: ChatWeb.start(:normal, []) returned an error: shutdown: failed to start child: ChatWeb.Endpoint 
    ** (EXIT) exited in: GenServer.call(Phoenix.CodeReloader.Server, :check_symlinks, :infinity)                                               
        ** (EXIT) an exception was raised:                                                                                                     
            ** (RuntimeError) trying to access Mix.Project.app_path for an umbrella project but umbrellas have no app                          
                (mix) lib/mix/project.ex:486: Mix.Project.app_path/1                                                                           
                (phoenix) lib/phoenix/code_reloader/server.ex:28: Phoenix.CodeReloader.Server.handle_call/3                                    
                (stdlib) gen_server.erl:636: :gen_server.try_handle_call/4                                                                     
                (stdlib) gen_server.erl:665: :gen_server.handle_msg/6                                                                          
                (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

benwilson512 · March 6, 2018, 4:05pm

That tutorial looks outdated, Phoenix comes with built in umbrella support now. Just mix phx.new some_path --umbrella

axelson · March 6, 2018, 5:57pm

That’s a known issue on 1.3.1

github.com/phoenixframework/phoenix

`mix phx.server` fails to run from umbrella root

opened 04:24PM - 22 Feb 18 UTC

closed 04:53PM - 22 Feb 18 UTC

piersadrian

### Environment * Elixir version (elixir -v): 1.6.1 * Phoenix version (mix deps): master @ 7b5025a * NodeJS version (node -v): v8.9.4 * NPM version (npm -v): 5.6.0 * Operating system: macOS 10.13.2 ### Expected behavior Running `mix phx.server` from the root of an umbrella should start serving Phoenix endpoints from child applications. ### Actual behavior Running `mix phx.server` from an umbrella root with one child app (otp_app: `:app`, mod: `App/AppWeb`, path: `apps/app`) causes an error. Repro: * `mix new test_umbrella --umbrella` * `cd test_umbrella/apps` * `mix phx.new app` Set dependencies in `test_umbrella/apps/app/mix.exs`: ``` ... {:phoenix, github: "phoenixframework/phoenix", override: true}, {:plug, "~> 1.5.0-rc2", override: true}, ... ``` From the root of the umbrella, `test_umbrella`, running `mix phx.server` throws: ``` [error] GenServer Phoenix.CodeReloader.Server terminating ** (RuntimeError) trying to access Mix.Project.app_path for an umbrella project but umbrellas have no app (mix) lib/mix/project.ex:486: Mix.Project.app_path/1 (phoenix) lib/phoenix/code_reloader/server.ex:28: Phoenix.CodeReloader.Server.handle_call/3 (stdlib) gen_server.erl:636: :gen_server.try_handle_call/4 (stdlib) gen_server.erl:665: :gen_server.handle_msg/6 (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3 Last message (from AppWeb.Endpoint): :check_symlinks State: false Client AppWeb.Endpoint is alive (stdlib) gen.erl:169: :gen.do_call/4 (elixir) lib/gen_server.ex:827: GenServer.call/3 (phoenix) lib/phoenix/endpoint/supervisor.ex:36: Phoenix.Endpoint.Supervisor.init/1 (stdlib) supervisor.erl:294: :supervisor.init/1 (stdlib) gen_server.erl:365: :gen_server.init_it/2 (stdlib) gen_server.erl:333: :gen_server.init_it/6 (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3 [info] Application app exited: App.Application.start(:normal, []) returned an error: shutdown: failed to start child: AppWeb.Endpoint ** (EXIT) exited in: GenServer.call(Phoenix.CodeReloader.Server, :check_symlinks, :infinity) ** (EXIT) an exception was raised: ** (RuntimeError) trying to access Mix.Project.app_path for an umbrella project but umbrellas have no app (mix) lib/mix/project.ex:486: Mix.Project.app_path/1 (phoenix) lib/phoenix/code_reloader/server.ex:28: Phoenix.CodeReloader.Server.handle_call/3 (stdlib) gen_server.erl:636: :gen_server.try_handle_call/4 (stdlib) gen_server.erl:665: :gen_server.handle_msg/6 (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3 ** (Mix) Could not start application app: App.Application.start(:normal, []) returned an error: shutdown: failed to start child: AppWeb.Endpoint ** (EXIT) exited in: GenServer.call(Phoenix.CodeReloader.Server, :check_symlinks, :infinity) ** (EXIT) an exception was raised: ** (RuntimeError) trying to access Mix.Project.app_path for an umbrella project but umbrellas have no app (mix) lib/mix/project.ex:486: Mix.Project.app_path/1 (phoenix) lib/phoenix/code_reloader/server.ex:28: Phoenix.CodeReloader.Server.handle_call/3 (stdlib) gen_server.erl:636: :gen_server.try_handle_call/4 (stdlib) gen_server.erl:665: :gen_server.handle_msg/6 (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3 ``` Looks like this issue was introduced in 3d70a05 ([relevant call to `Mix.Project.app_path/1`](https://github.com/phoenixframework/phoenix/commit/3d70a05a9147ceef4d7e4ec91682c1363e6a151c#diff-627d49076c03a65473151dfc710d2d2eR28)). Thanks! Let me know if I can help with more info or a PR. Not sure I understand the Mix project structure well enough yet to fix on my own, but happy to help.