@Override
  public void addBooleanField(String fieldName, boolean value) {
    if (logger.isTraceEnabled()) {
      logger.trace("addBooleanField fieldName: {}; value: {}", fieldName, value);
    }
    m_pdxInstanceFactory.writeBoolean(fieldName, value);
    addIdentityField(fieldName);
  }
This class is intermediate class to create PdxInstance.
geode-core/src/main/java/org/apache/geode/pdx/internal/json/PdxInstanceHelper.java