在Jmeter中发布数据时响应422错误

我在通过JMeter中的POST方法传递JSON时遇到问题。我的所有实例都是正确的，但为什么它会向我显示错误“instance cannot be null”。我已经在《邮递员》上测试过了，它是有效的，但当我使用JMeter时却没有。你能帮我解决这个问题吗？谢谢

JSON：

{
    "$class": "model.Koleksi",
    "koleksiId": "003",
    "nama": "Koleksi 9",
    "jumlah": 9,
    "kondisi": "BAIK",
    "kategori": "Geografika",
    "status": "citrus-fruit-food-fruit-oranges-207085.jpg",
    "keterangan": "Sakti jow",
    "tanggalbentuk": "2020-03-12T12:05:58.113Z",
    "owner": "resource:model.Organisasi#K001",
    "issuer": "resource:model.Organisasi#O001"
 }

错误：

{"error":{"statusCode":422,"name":"ValidationError","message":"The `Koleksi` instance is not valid. Details: `koleksiId` can't be blank (value: undefined); `nama` can't be blank (value: undefined); `jumlah` can't be blank (value: undefined); `kondisi` can't be blank (value: undefined); `kategori` can't be blank (value: undefined); `status` can't be blank (value: undefined); `keterangan` can't be blank (value: undefined); `tanggalbentuk` can't be blank (value: undefined); `owner` can't be blank (value: undefined); `issuer` can't be blank (value: undefined).","details":{"context":"Koleksi","codes":{"koleksiId":["presence"],"nama":["presence"],"jumlah":["presence"],"kondisi":["presence"],"kategori":["presence"],"status":["presence"],"keterangan":["presence"],"tanggalbentuk":["presence"],"owner":["presence"],"issuer":["presence"]},"messages":{"koleksiId":["can't be blank"],"nama":["can't be blank"],"jumlah":["can't be blank"],"kondisi":["can't be blank"],"kategori":["can't be blank"],"status":["can't be blank"],"keterangan":["can't be blank"],"tanggalbentuk":["can't be blank"],"owner":["can't be blank"],"issuer":["can't be blank"]}},"stack":"ValidationError: The `Koleksi` instance is not valid. Details: `koleksiId` can't be blank (value: undefined); `nama` can't be blank (value: undefined); `jumlah` can't be blank (value: undefined); `kondisi` can't be blank (value: undefined); `kategori` can't be blank (value: undefined); `status` can't be blank (value: undefined); `keterangan` can't be blank (value: undefined); `tanggalbentuk` can't be blank (value: undefined); `owner` can't be blank (value: undefined); `issuer` can't be blank (value: undefined).\n    at /home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/dao.js:400:12\n    at Koleksi.<anonymous> (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/validations.js:578:11)\n    at Koleksi.next (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/hooks.js:93:12)\n    at Koleksi.<anonymous> (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/validations.js:575:23)\n    at Koleksi.trigger (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/hooks.js:83:12)\n    at Koleksi.Validatable.isValid (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/validations.js:541:8)\n    at /home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/dao.js:396:9\n    at doNotify (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)\n    at doNotify (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)\n    at doNotify (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)\n    at doNotify (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:155:49)\n    at Function.ObserverMixin._notifyBaseObservers (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:178:5)\n    at Function.ObserverMixin.notifyObserversOf (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:153:8)\n    at Function.ObserverMixin._notifyBaseObservers (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:176:15)\n    at Function.ObserverMixin.notifyObserversOf (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:153:8)\n    at Function.ObserverMixin._notifyBaseObservers (/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer-rest-server/node_modules/loopback-datasource-juggler/lib/observer.js:176:15)"}}

{“error”：{“statusCode”：422，“name”：“ValidationError”，“message”：“Koleksi”实例无效。详细信息：`koleksiId`不能为空（值：未定义）；`nama`不能为空（值：未定义）；`jumlah`不能为空（值：未定义）；`kondisi`不能为空（值：未定义）；`kategori`不能为空（值：未定义）；`status`不能为空（值：未定义）；`keterangan`不能为空（值：未定义）；`tanggalbentuk`不能为空（值：未定义）；`owner`不能为空（值：未定义）；`issuer`不能为空（值：未定义）；`details:{“上下文”：“Koleksi”，“代码”：{“Koleksid”：[“在场”]，“nama:[“在场”]，“朱姆拉”：“在场”]，“kondisi”：[“在场”]，“卡蒂戈里”：[“在场”]，“状态”：[“在场”]，“凯特兰根”：[“在场”]，“唐加尔本图克”：[“在场”]，“所有者”：[“在场”]，“发行人”：[“在场”]，“消息”：{“Koleksii”：[“不能为空”]，“纳玛”：[“不能为空”]，“朱姆拉”：[“不能为空”，“康迪西”：“不能为空”；“卡蒂戈里”：“不能为空”；“不能为空”；“状态不能为空”，“keterangan”：[“不能为空”]，“tanggalbentuk”：[“不能为空”]，“所有者”：[“不能为空”]，“颁发者”：[“不能为空”]}，“堆栈”：“验证错误：Koleksi`实例无效。详细信息：`koleksiId`不能为空（值：未定义）；`nama`不能为空（值：未定义）；`jumlah`不能为空（值：未定义）；`kondisi`不能为空（值：未定义）；`kategori`不能为空（值：未定义）；`status`不能为空（值：未定义）；`keterangan`不能为空（值：未定义）；`tanggalbentuk`不能为空（值：未定义）；`owner`不能为空（值：未定义）；`issuer`不能为空（值：未定义）.\n在/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/dao.js:400:12\n在Koleksi。（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/validations/lib/validations.js.js:578:11）\n在（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/hooks.js:93:12）\n在Koleksi。（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/lib/validations/lib/validations.js.js:575:23（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/hooks.js:83:12）\n位于Koleksi.validable.isValid（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/composer rest/loopback datasource juggler/lib/validations.js/js/js\n位于/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/dao.js:396:9\n位于doNotify（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loop-datasource juggler/lib/observer.js:155:49）\n位于doNotify）（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/observer.js:155:49）\n在doNotify（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/lib/observer/observer.js:155:49）\n（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/observer.js:155:49）\n at Function.observer mixin.\u notifybaseobsers（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/composer rest server/node_modules/node/composer rest/node_mod\n位于Function.ObserverMixin.notifyObserversOf（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/observer.js:153:8）\n位于Function.observer mixin.\u notifybaseobsers（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/loopback datasource juggler/lib/observer.js:176:15）\n在Function.observer mixin.notifyobserver（/home/sachi/.nvm/versions/node/v8.17.0/lib/node_modules/composer rest server/node_modules/composer/node_-server/node_-server/composer rest-modules/node_-\n在Function.ObserverMixin.\u notifyBaseObservers（/home/sachi/.nvm/versions/node/v8.17.0/lib/node\u modules/composer rest server/node\u modules/loopback datasource juggler/lib/observer.js:176:15）}

我认为您的JSON在这里是错误的，键名应该是

“class”

而不是

“$class”

。请您仔细检查一下

正确的JSON可能是：

{
    "class": "model.Koleksi",
    "koleksiId": "003",
    "nama": "Koleksi 9",
    "jumlah": 9,
    "kondisi": "BAIK",
    "kategori": "Geografika",
    "status": "citrus-fruit-food-fruit-oranges-207085.jpg",
    "keterangan": "Sakti jow",
    "tanggalbentuk": "2020-03-12T12:05:58.113Z",
    "owner": "resource:model.Organisasi#K001",
    "issuer": "resource:model.Organisasi#O001"
 }

---

这是一个错误的请求错误。错误

'instance cannot be null'

实际上是为请求正文（精确的键值对）验证而显示的。

很可能是您没有发送正确的标头和值，因此服务器无法“理解”您的请求

尝试将添加作为发送上述JSON的HTTP请求采样器的子级，并将其配置为发送上述标头，如：

---

一般来说，如果请求在Postman中运行良好，您应该能够使用JMeter记录它，只需在Postman中执行您的请求—JMeter将捕获带有所有必要头的请求，并且您将能够重播它