code: public static <T> T fromString(String value, Class<T> valueType) throws IOException {
          return INSTANCE.mapper.readValue(value, valueType);
      }
docs: Returns the object of the specified class represented by the specified JSON {@code String}.
  
  @param value the JSON {@code String} to be parsed
  @param valueType the class of the object to be parsed
  @param <T> the type of the object to be parsed
  @return an object of the specified class represented by {@code value}
  @throws IOException if there are parsing problems