java - 没有找到接口(interface) java.util.List Rest API Spring boot 的主构造函数或默认构造函数

Question

我将请求正文传递给 postman 上的 POST 请求，与此类似:

 "name":"Mars",
"artifacts":[
   {
      "elements":[
         {
            "name":"carbon",
            "amount":0.5,
            "measurement":"g"
         }
      ],
      "typeName":"typeA"
   },
   {
      "elements":[
         {
            "name":"hydrogen",
            "amount":0.2,
            "measurement":"g"
         }
      ],
      "typeName":"typeB"
   }
]

rest controller 中的 create 方法如下所示。

  @RequestMapping("/create")
  public Planet create(@RequestBody Planet data) {
      Planet mars = planetService.create(data.getName(),data.getArtifacts());
      return mars;

Planet 及其所有嵌套对象都有一个默认构造函数，例如:

public Planet() {}

但是，由于缺少默认构造函数，我无法创建新的行星对象。请帮忙!

编辑: 行星类

public class Planet {
@JsonProperty("name")
private String name;
@Field("artifacts")
private List<Artifact> artifacts;

public Planet() {}

public Planet(String name, List<Artifact> artifacts)
{
this.name = name;
this.artifacts = artifacts;
}
//setters and getters

}

工件类:

public class Artifact() {
@Field("elements")
private List<Element> elements;
@JsonProperty("typeName")
private String typeName;

public Artifact() {}

public Artifact(String typeName, List<Element> elements)
{
this.typeName = typeName;
this.elements = elements;
}
}

元素类:

public class Element() {
@JsonProperty("elementName")
private String name;
@JsonProperty("amount")
private double amount;
@JsonProperty("measurement")
private String measurement;

public Element() {}

public Element(String name, double amount, String measurement)
{
//assignments
}
}

Answer 1

当我忘记参数前的@RequestBody时，我遇到了同样的错误

  @RequestMapping("/create")
  public Planet create(@RequestBody Planet data) {