我经常将json作为请求体的一部分传递给spring控制器。不是为了我的生活，我不能让这个工作？给我400个坏请求。
Spring控制器：

@RequestMapping(value = "/saverefunds", method = RequestMethod.POST)
    @ResponseBody
    public String saveRefunds(Model model, HttpSession session, AS400WriteRefundLine as400WriteRefundLine, @RequestBody CreateRefund refunddetails) throws ParseException, IOException {
////
}

调用它的javascript代码：

let refunddetails = {
            blackbookno: refundedInvoiceNo,
            RfExno: "00",                                      
            transactionType: "R",
            stockid: stockid,
            sku: sku,
            refundtype: refundtype,
            refundreason: refundreason,
            btsflag: btsflag,
            uniqueid: uniqueid,
            thisrefundamount: thisrefund,
            firstrecord: firstRecord.toString(),                
            nextRfEx:"1",                                        
            firstname: wFname,
            surname: wLname,
            address1: wAdd1,
            address2: wAdd2,
            town: wTown,
            county: wCounty,
            landline: wTelno,
            mobile: wMobile,
            email: wEmail
        };

        await $.ajax({
            type: 'POST',
            contentType: 'application/json; charset=utf-8',
            url: "saverefunds",
            data: JSON.stringify(refunddetails),
            success: function (data) {
                alert(data);
                if (data.substring(0, 2) != "OK:") {
                    // ERROR
                    alert("postErr: " + data);
                } else {
                    alert('Refund Generated');
                }
                return true;
            },
            error: function (error) {
                alert('ERROR:'+error.responseText);
            }
        });

createrefund对象：

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@JsonIgnoreProperties
public class CreateRefund {
    private String blackbookno, RfExno, transactionType, stockid, sku, refundtype, refundreason, btsflag,
            uniqueid, thisrefundamount, firstrecord, nextRfEx, firstname,
            surname, address1, address2, town, county, landline, mobile, email;
}

pojo与正在传递的json匹配，所以不确定它还能是什么？
有人看到什么明显的错误吗？
我可以传递数据的唯一方法是在spring控制器中使用map<string，string>，而不是createreturn对象…所以我假设jsonMap不起作用？
非常感谢