JAX-RS validation returns false errors when method has multiple pathparams with regexp

In a JAX-RS enabled project, have a method with the following signature: @GET @Path( "/user/{id}/{format:(/format/[^/]+?)?}/{encoding:(/encoding/[^/]+?)?}" ) public Response getContent(@PathParam( "id" ) int id, @PathParam( "format" ) String format, @PathParam( "encoding" ) String encoding, @QueryParam( "start" ) int start) { ... } The JAX-RS validation returns an errors. Removing the regexp in the @Path annotation fixes the validation.