code: @Override
      public Integer parameterAsInteger(String name) {
          String parameter = parameter(name);
          try {
              return Integer.parseInt(parameter);
          } catch (Exception e) {  //NOSONAR
              return null;
          }
      }
docs: Same like {@link #parameter(String)}, but converts the parameter to
  Integer if found.
  <p/>
  The parameter is decoded by default.
  
  @param name The name of the post or query parameter
  @return The value of the parameter or null if not found.