We've pushed a version of AeroGear Controller with support for request parameters (AEROGEAR-671) to openshift.

This demo has the following new route added to it:

route()
      .from("/cars")
      .on(RequestMethod.GET)
      .produces(MediaType.JSON.toString(), "application/custom")
      .to(Home.class).get(param("color", "pink"), param("brand", "mini"));