java - Ninja 框架端点在尝试将 JSON 映射到自定义对象时抛出 500 错误

Question

所以我在这里有一个 Ninja 端点:

public Result processRecurring(Context context, RecurOrderJSON recurOrderJSON) {
    String id = recurOrderJSON.id;
    String event_type = recurOrderJSON.event_type;
    String request_id = recurOrderJSON.request_id;
    //Map data = recurOrderJSON.data;
    //recurringRouter(event_type, data);
    log.info("ID value");
    log.info(id);

    return JsonResponse.build()
            .message("OK")
            .toResult();
}

我要映射到的类:

public class RecurOrderJSON {

    public String id;
    public String event_type;
    public String request_id;
    // Maybe switch data type?
    //public Map data;
}

还有路线:

router.POST().route("/recurring").with(RecurringController::processRecurring);

我只是想将一些简单的 JSON 发送到 webhook，但出于某种原因，对象映射似乎不起作用。我想也许我误解了文档？

http://www.ninjaframework.org/documentation/working_with_json_jsonp.html

他们给你的例子是这样的:

If you send that JSON to your application via the HTTP body you only need to add the POJO class to the controller method and Ninja will parse the incoming JSON for you:

package controllers;

public class ApplicationController {       

    public Result parsePerson(Person person) {

        String nameOfPerson = person.name; // will be John Johnson
        ...

    }
}

据我所知，我这样做是否正确？我对文档的理解有误吗？这是一个 JSON 对象示例 - 目前我只是想获取顶级字符串，但我最终也想获取数据:

{
  "id": "hook-XXXXX",
  "event_type": "tx-pending",
  "data": {
    "button_id": "static",
    "publisher_organization": "org-XXXXXXX",
    "campaign_id": "camp-097714a40aaf8965",
    "currency": "USD",
    "order_currency": "USD",
    "id": "tx-XXXXXXX",
    "category": "new-user-order",
    "modified_date": "2018-10-15T05:41:12.577Z",
    "order_total": 9680,
    "button_order_id": "btnorder-77c9e56fd990f127",
    "publisher_customer_id": "XymEz8GO2M",
    "rate_card_id": "ratecard-41480b2a6b1196a7",
    "advertising_id": null,
    "event_date": "2018-10-15T05:41:06Z",
    "status": "pending",
    "pub_ref": null,
    "account_id": "acc-4b17f5a014d0de1a",
    "btn_ref": "srctok-0adf9e958510b3f1",
    "order_id": null,
    "posting_rule_id": null,
    "order_line_items": [
      {
        "identifier": "Antique Trading Card",
        "description": "Includes Lifetime Warranty",
        "amount": 9680,
        "publisher_commission": 968,
        "attributes": {},
        "total": 9680,
        "quantity": 1
      }
    ],
    "order_click_channel": "webview",
    "order_purchase_date": null,
    "validated_date": null,
    "amount": 968,
    "customer_order_id": null,
    "created_date": "2018-10-15T05:41:12.577Z",
    "commerce_organization": "org-XXXXXX"
  },
  "request_id": "attempt-XXXXXXX"
}

目前我只是想获取字符串值，但我不断收到 500 错误，并且在我的日志中没有任何其他错误指示​​。

据我所知，Ninja 应该自动将 JSON 映射到我的对象，对吗？

Answer 1

我成功重现了你的问题，然后修复了它。

首先，为了便于尝试/测试，我建议(临时)修改:

package controllers;

import models.RecurOrderJSON;
import ninja.Context;
import ninja.Result;

public class RecurringController {
    public Result processRecurring(Context context, RecurOrderJSON recurOrderJSON) {
        log.info("recurOrderJSON => " + recurOrderJSON);
        return ninja.Results.ok();
    }
}

然后，以这种方式更新您的模型:

package models;

import java.util.Map;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@JsonIgnoreProperties(ignoreUnknown = true)
public class RecurOrderJSON {

    public String id;
    public String event_type;
    public String request_id;
    public Map data;

    @Override
    public String toString() {
        return "RecurOrderJSON [id=" + id + ", event_type=" + event_type + ", request_id=" + request_id + ", data="
                + data.toString() + "]";
    }
}

你可以注意到:

• 数据类型必须保持原始(这里不能使用泛型)
• 重要的@JsonIgnoreProperties(ignoreUnknown = true) 注释可以避免反序列化问题，如果您的源数据与您的模型不完全匹配(一定要使用最新版本的注释，在 fasterxml 子包中，而不是旧的一个，在 codehaus 子包中)
• toString() 实现仅允许快速检查 OK/KO 反序列化

然后您可以使用wget 或curl 轻松测试系统:

curl -H 'Content-Type: application/json' -d "@/tmp/jsonINput.json" -X POST http://localhost:8080/recurring

请注意，指定 Content-type 以获得良好的解释非常重要。

/tmp/jsonINput.json 文件包含您在问题中指定的 json 内容。

这样，一切都像魅力一样工作，获得这个输出:

recurOrderJSON => RecurOrderJSON [id=hook-XXXXX, event_type=tx-pending, request_id=attempt-XXXXXXX, data={button_id=static, publisher_organization=org-XXXXXXX, campaign_id=camp-097714a40aaf8965, currency=USD, order_currency=USD, id=tx-XXXXXXX, category=new-user-order, modified_date=2018-10-15T05:41:12.577Z, order_total=9680, button_order_id=btnorder-77c9e56fd990f127, publisher_customer_id=XymEz8GO2M, rate_card_id=ratecard-41480b2a6b1196a7, advertising_id=null, event_date=2018-10-15T05:41:06Z, status=pending, pub_ref=null, account_id=acc-4b17f5a014d0de1a, btn_ref=srctok-0adf9e958510b3f1, order_id=null, posting_rule_id=null, order_line_items=[{identifier=Antique Trading Card, description=Includes Lifetime Warranty, amount=9680, publisher_commission=968, attributes={}, total=9680, quantity=1}], order_click_channel=webview, order_purchase_date=null, validated_date=null, amount=968, customer_order_id=null, created_date=2018-10-15T05:41:12.577Z, commerce_organization=org-XXXXXX}]