我在物件中有一個JSONArray欄位：

@Column(name = "_history", columnDefinition = "JSON") @Convert(converter = JSONArrayConverter.class) private JSONArray history;

這是JSONArrayConverter的程式碼：

@JsonSerialize @Converter(autoApply = true) public class JSONArrayConverter implements AttributeConverter { public static final Logger LOGGER = LoggerFactory.getLogger(JSONObjectConverter.class); @Override public String convertToDatabaseColumn(JSONArray array) { LOGGER.debug(array.toString()); if (array == null) return new JSONArray().toString(); String data = null; try { data = array.toString(); } catch (final Exception e) { LOGGER.error("JSON writing error", e); } return data; } @Override public JSONArray convertToEntityAttribute(String data) { if (_EMPTY.equals(data) || data == null || "[]".equals(data)) return new JSONArray(); JSONArray array = null; try { array = new JSONArray(data); } catch (final Exception e) { LOGGER.error("JSON reading error", e); } return array; } }

問題是當從MySQL資料庫請求物件時（history是JSON列並且有資料），Spring Boot將其傳回為空：

"history": {}