JAX-RS Jersey, how to dynamic adding resources or providers to Application

Answer 1

Programmatic API for building resources

The Resource class is what your are looking for. Just mind it's a Jersey specific API.

According to the documentation, the Resource class is the main entry point to the programmatic resource modeling API that provides ability to programmatically extend the existing JAX-RS annotated resource classes or build new resource models that may be utilized by Jersey runtime.

Have a look at the example provided by the documentation:

@Path("hello")
public class HelloResource {

     @GET
     @Produces("text/plain")
     public String sayHello() {
         return "Hello!";
     }
}

// Register the annotated resource.
ResourceConfig resourceConfig = new ResourceConfig(HelloResource.class);

// Add new "hello2" resource using the annotated resource class
// and overriding the resource path.
Resource.Builder resourceBuilder =
        Resource.builder(HelloResource.class, new LinkedList())
        .path("hello2");

// Add a new (virtual) sub-resource method to the "hello2" resource.
resourceBuilder.addChildResource("world")
        .addMethod("GET")
        .produces("text/plain")
        .handledBy(new Inflector() {

                @Override
                public String apply(Request request) {
                    return "Hello World!";
                }
        });

// Register the new programmatic resource in the application's configuration.
resourceConfig.registerResources(resourceBuilder.build());

The following table illustrates the supported requests and provided responses for the application configured in the example above:

  Request              |  Response        |  Method invoked
-----------------------+------------------+----------------------------
   GET /hello          |  "Hello!"        |  HelloResource.sayHello()
   GET /hello2         |  "Hello!"        |  HelloResource.sayHello()
   GET /hello2/world   |  "Hello World!"  |  Inflector.apply()

For additional details, check the Jersey documentation.