code: public static Integer getIntegerProperty(Properties properties, String key) {
          String property = getStringProperty(properties, key);
          if (property == null) {
              return null;
          }
          Integer value;
          try {
              value = Integer.parseInt(property);
          } catch (RuntimeException e) {
              throw new ODataClientRuntimeException("Unable to parse property. " + property, e);
          }
          return value;
      }
docs: Get an integer property from the properties.
  
  @param properties the provided properties
  @return the integer property