private Stage getStage(ServletContext context) {
   final String stageAsString = context.getInitParameter("resteasy.guice.stage");
   if (stageAsString == null) {
     return null;
   }
   try {
     return Stage.valueOf(stageAsString.trim());
   } catch (IllegalArgumentException e) {
     throw new RuntimeException(Messages.MESSAGES.injectorStageNotProperlyDefined(stageAsString));
   }
 }