fix(gw): load emqx applications before hocon configs checking

apps/emqx_gateway/src/emqx_gateway_app.erl

@@ -45,7 +45,7 @@ load_default_gateway_applications() ->
         fun(Def) ->
             load_gateway_application(Def)
         end,
-        emqx_gateway_utils:find_gateway_definations()
+        emqx_gateway_utils:find_gateway_definitions()
     ).
 
 load_gateway_application(

apps/emqx_gateway/src/emqx_gateway_schema.erl

@@ -75,7 +75,7 @@ fields(gateway) ->
                     }
                 )}
         end,
-        emqx_gateway_utils:find_gateway_definations()
+        emqx_gateway_utils:find_gateway_definitions()
     );
 fields(clientinfo_override) ->
     [

apps/emqx_gateway/src/emqx_gateway_utils.erl

@@ -47,7 +47,7 @@
     listener_chain/3,
     make_deprecated_paths/1,
     make_compatible_schema/2,
-    find_gateway_definations/0
+    find_gateway_definitions/0
 ]).
 
 -export([stringfy/1]).
@@ -564,8 +564,8 @@ make_compatible_schema2(Path, SchemaFun) ->
         Schema
     ).
 
--spec find_gateway_definations() -> list(gateway_def()).
-find_gateway_definations() ->
+-spec find_gateway_definitions() -> list(gateway_def()).
+find_gateway_definitions() ->
     lists:flatten(
         lists:map(
             fun(App) ->

bin/nodetool

@@ -362,6 +362,20 @@ add_libs_dir() ->
 add_lib_dir(RootDir, Name, Vsn) ->
     LibDir = filename:join([RootDir, lib, atom_to_list(Name) ++ "-" ++ Vsn, ebin]),
     case code:add_patha(LibDir) of
-        true -> ok;
+        true ->
+            %% load all applications into application controller, before performing
+            %% the configuration check of HOCON
+            %%
+            %% It helps to implement the feature of dynamically searching schema.
+            %% See `emqx_gateway_schema:fields(gateway)`
+            is_emqx_application(Name) andalso application:load(Name),
+            ok;
         {error, _} -> error(LibDir)
     end.
+
+is_emqx_application(Name) when is_atom(Name) ->
+    is_emqx_application(atom_to_list(Name));
+is_emqx_application("emqx_" ++ _Rest) ->
+    true;
+is_emqx_application(_) ->
+    false.