@Override
  public void addBigIntegerField(String fieldName, BigInteger value) {
    if (logger.isTraceEnabled()) {
      logger.trace("addBigIntegerField fieldName: {}; value: {}", fieldName, value);
    }
    fieldList.add(new JSONFieldHolder(fieldName, value, FieldType.OBJECT));
  }
This class is intermediate class to create PdxInstance.
geode-core/src/main/java/org/apache/geode/pdx/internal/json/PdxInstanceSortedHelper.java