private static function Initialise()
 {
     if (self::$initialised) {
         return;
     }
     self::$logger = RXPLogger::getLogger(__CLASS__);
     self::$mappers = array();
     self::$mappers[HppRequest::GetClassName()] = new RequestMapper();
     self::$mappers[HppResponse::GetClassName()] = new ResponseMapper();
     self::$initialised = true;
 }