Take the following code:

@Path("/")
public class CarResource {
	
	@PathParam("id")
	private Integer id;
	
	@GET
	@Path("{id}")
	public Object getCar() {
		return null;
	}
}

replace @PathParam("id") with @PathParam("i"), there is no problem reported in 'as-you-type', while there should be (user has to save the file to see the problem markers).
Same goes when changing the value of the @Path annotation on the method: no 'as-you-type' problem report.