JAX-RS 2 spec section 2.3.7 2(f), 2(g) and 2(h)steps. 2(h) should filter the methods removing the regex ones and keep only the literal and it does not seen to be respected. Let's say we have the following JAX-RS resource:

@Path("resource")
public class Resource {

	@GET
	@Path("{type}")
	public Object get(@PathParam("type") String type) throws Exception {
		return "{type} invoked";
	}

	@GET
	@Path("other")
	@Produces(MediaType.APPLICATION_XML)
	public Response other() {
		return Response.ok("other invoked").build();
	}

}

Trying to request application/xml with a q parameter will work:

$ curl -H 'Accept: application/xml;q=0.9' http://localhost:8080/web-app-context/resource/other
other invoked

However, if we add text/plain it will invoke the method get:

$ curl -H 'Accept: text/plain, application/xml;q=0.9' http://localhost:8080/web-app-context/resource/other
{type} invoked

As said, JAX-RS 2 spec section 2.3.7 2(f), 2(g) and 2(h)steps is related to the method matching. 2(h) should filter the methods removing the regex ones and keep only the literal, in our case, at this step we hope that "

" is removed and only "other" is kept because the list of regex was sorted based on the number of literals (see 2(f)). E is the list of regex, and then we have Rmatch, which is "Set Rmatch to be the first member of E". Next, in 2(h) we have:

**M =

**

it says =, not matches, so my understanding is that it throws away

seems to be still part of this.