[alibaba/fastjson]一串json字符串，转换成java对象，javaBean中无默认构造函数时，其余字段值转换丢失

如题，有如下实体类

public class IvsAPIResult implements Serializable {
@JsonProperty("success")
private Boolean success;
@JsonProperty("reason_code")
private String reasonCode;
@JsonProperty("reason_desc")
private String reasonDesc;
@JsonProperty("custom_id")
private String customId;
@JsonProperty("decision_id")
private String decisionId;
@JsonProperty("result_desc")
private JSONObject resultDesc;

public IvsAPIResult(Boolean success) {
    this.setSuccess(success);
}

public IvsAPIResult setReason(ReasonCodeEnum reason) {
    this.setReasonCode(reason.getCode());
    this.setReasonDesc(reason.getDesc());
    return this;
}

public static IvsAPIResult failureResult(ReasonCodeEnum reasonCodeEnum) {
    return (new IvsAPIResult(Boolean.FALSE)).setReason(reasonCodeEnum);
}

public static IvsAPIResult failureResult(String code, String desc) {
    IvsAPIResult result = new IvsAPIResult(Boolean.FALSE);
    result.setReasonCode(code);
    result.setReasonDesc(desc);
    return result;
}

public Boolean getSuccess() {
    return this.success;
}

public void setSuccess(Boolean success) {
    this.success = success;
}

public String getReasonCode() {
    return this.reasonCode;
}

public void setReasonCode(String reasonCode) {
    this.reasonCode = reasonCode;
}

public String getReasonDesc() {
    return this.reasonDesc;
}

public void setReasonDesc(String reasonDesc) {
    this.reasonDesc = reasonDesc;
}

public String getCustomId() {
    return this.customId;
}

public void setCustomId(String customId) {
    this.customId = customId;
}

public String getDecisionId() {
    return this.decisionId;
}

public void setDecisionId(String decisionId) {
    this.decisionId = decisionId;
}

public JSONObject getResultDesc() {
    return this.resultDesc;
}

public void setResultDesc(JSONObject resultDesc) {
    this.resultDesc = resultDesc;
}
} 

有如下json字符串与实体类对应

{
"customId": "WF2018101018152610126468",
"decisionId": "1539052159989116750",
"resultDesc": {
"questionLibrary": "income",
"decision": "review",
"desc": "恭喜答题通过"
},
"success": true
}

对上述字符串转换成IvsApiResult进行测试，发现转换后字段内容全部丢失，但Gson是成功的

public static void main(String[] args) {
    String s = "{\"customId\":\"WF2018101018152610126468\",\"decisionId\":\"1539052159989116750\",\"resultDesc\":{\"questionLibrary\":\"income\",\"decision\":\"review\",\"desc\": \"恭喜答题通过\"},\"success\":true}";
    Gson gson = new Gson();
    IvsAPIResult ivsAPIResult = gson.fromJson(s, IvsAPIResult.class);
    System.out.println(ivsAPIResult.getCustomId() + "==" + JSON.toJSONString(ivsAPIResult));

    System.out.println("-----");
    IvsAPIResult apiResult = JSON.parseObject(s, IvsAPIResult.class);
    System.out.println(apiResult.getCustomId() + "==" + JSON.toJSONString(apiResult));
}

上述main函数运行结果如下

WF2018101018152610126468=={"customId":"WF2018101018152610126468","decisionId":"1539052159989116750","resultDesc":{"questionLibrary":"income","decision":"review","desc":"恭喜答题通过"},"success":true}
-----
null=={"success":true}