我们有以下简单的Web服务器：

package spring;

import avro.BatteryEvent;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.util.Date;

@RestController
public class EnergyResourcesController {
    private final Date date = new Date();

    @PostMapping("/event/{uuid}")
    BatteryEvent postBatteryEvent(
        @PathVariable("uuid") String uuid,
        @RequestBody BatteryEvent batteryEvent) throws IOException {
        batteryEvent.setTime(date.getTime());
        return batteryEvent;
    }
}

它使用一个 BatteryEvent ，这是一个avro生成的类，它是根据以下avro架构构建的：

{
  "namespace": "avro",
  "type": "record",
  "name": "BatteryEvent",
  "fields": [
    {
      "name": "charging_source",
      "type": [
        "string",
        "null"
      ]
    },
    {
      "name": "processor4_temp",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "device_id",
      "type": [
        "string",
        "null"
      ]
    },
    {
      "name": "processor2_temp",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "processor1_temp",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "charging",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "current_capacity",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "inverter_state",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "moduleL_temp",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "moduleR_temp",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "processor3_temp",
      "type": [
        "int",
        "null"
      ]
    },
    {
      "name": "soC_regulator",
      "type": [
        "float",
        "null"
      ]
    },
    {
      "name": "time",
      "type": [
        "long",
        "null"
      ],
      "logicalType": "local-timestamp-millis"
    }
  ]
}

我们向Web服务器发送以下json，

{
  "charging_source": "utility",
  "processor4_temp": 160,
  "device_id": "18806072-81ca-48ed-b01a-b080f2d8a1fa",
  "processor2_temp": 96,
  "processor1_temp": 60,
  "charging": -912,
  "current_capacity": 10948,
  "inverter_state": 1,
  "moduleL_temp": 199,
  "moduleR_temp": 91,
  "processor3_temp": 152,
  "soC_regulator": 26.598085
}

问题在于 BatteryEvent 我们所得到的一切 null 价值观 charging 场，就像这样：

{"charging_source": null, "processor4_temp": null, "device_id": null, "processor2_temp": null, "processor1_temp": null, "charging": -261, "current_capacity": null, "inverter_state": null, "moduleL_temp": null, "moduleR_temp": null, "processor3_temp": null, "soC_regulator": null, "time": null}

我的问题是，为什么会这样？所有发送的数据都是有效的json，我们的avro类也是有效的。我们的springboot服务器是从springboot自己的文档中提取的简单有效的代码。我想要spring boot向 BatteryEvent 对象来包含发送的电池事件json中的值。