code: public Integer getValueInteger(String label) {
          PrimitiveObject o = getPrimitiveObject(VALUE, label, ObjectUtil.INTEGER, "Integer");
          if (o == null) {
              return null;
          }
          return (Integer) o.getObject();
      }
docs: Get value {@link Integer} value
  @param label target label
  @return {@link Integer} value of the label. If it is not null.