How to use Swagger in non-trivial Wildfly Swarm project?

In a very simple Wildfly Swarm project Swagger works fine and produces the expected swagger.json output. But as soon as a second java package is added to the project, it doesn't work anymore.

Example (see https://github.com/pe-st/swagger42 example project):

the first commit consists of the project as generated by http://wildfly-swarm.io/ (containing one class HelloWorldEndpoint in the package ch.schlau.pesche.swagger42.rest)

the second commits adds minimal Swagger annotations and generates the following swagger.json :

{
  "swagger": "2.0",
  "info": {},
  "basePath": "/",
  "paths": {
    "/hello": {
      "get": {
        "summary": "Get the response",
        "description": "",
        "operationId": "doGet",
        "produces": [
          "text/plain"
        ],
        "parameters": [],
        "responses": {
          "default": {
            "description": "successful operation"
          }
        }
      }
    }
  }
}

the third commit adds an empty class in a second java package ch.schlau.pesche.swagger42.core. Now the generated swagger.json looks like this:
```
{"swagger":"2.0","info":{},"basePath":"/"}
```

What has to be done to make Swagger work in projects like these?

Solution

https://wildfly-swarm.gitbooks.io/wildfly-swarm-users-guide/advanced/swagger.html

Create a file META-INF/swarm.swagger.conf

and add following entry:

packages:ch.schlau.pesche.swagger42.rest

There is a info in the startup:

[org.wildfly.swarm.swagger] (main) WFSSWGR0004: Configure Swagger for deployment 
demo.war with package ch.schlau.pesche.swagger42.core

or similar, which packages is scanned.