Java 无法反序列化<；的实例；数据模型>；启动外\u对象标记

我面临着Spring和Jackson的问题。我试图从中获取输入。我已经使用

模型是

package io.github.mat3e.earthquake.jsonObject;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonPropertyOrder;

import java.util.List;

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
    "type",
    "metadata",
    "features",
    "bbox"
})
public class DataModel {

    @JsonProperty("type")
    private String type;
    @JsonProperty("metadata")
    private Metadata metadata;
    @JsonProperty("features")
    private List<Feature> features = null;
    @JsonProperty("bbox")
    private List<Double> bbox = null;

    @JsonProperty("type")
    public String getType() {
        return type;
    }

    @JsonProperty("type")
    public void setType(String type) {
        this.type = type;
    }

    @JsonProperty("metadata")
    public Metadata getMetadata() {
        return metadata;
    }

    @JsonProperty("metadata")
    public void setMetadata(Metadata metadata) {
        this.metadata = metadata;
    }

    @JsonProperty("features")
    public List<Feature> getFeatures() {
        return features;
    }

    @JsonProperty("features")
    public void setFeatures(List<Feature> features) {
        this.features = features;
    }

    @JsonProperty("bbox")
    public List<Double> getBbox() {
        return bbox;
    }

    @JsonProperty("bbox")
    public void setBbox(List<Double> bbox) {
        this.bbox = bbox;
    }

}

---

感谢@Willem和@mkarasik的帮助：

我在代码中做了以下更改

@GetMapping("/3")
    public String getCostam() {
        RestTemplate rest = new RestTemplate();

        ResponseEntity<DataModel> responseEntity = restTemplate.getForEntity(url2, DataModel.class);

        MediaType contentType = responseEntity.getHeaders().getContentType();
        HttpStatus statusCode = responseEntity.getStatusCode();

        System.out.println(responseEntity
                .getBody().getFeatures());



        return statusCode.toString();

    }

谢谢你们的帮助。我得到了我需要的

---

现在我想从前端映射参数，以将其提供给后端，而不是硬编码字符串。

您的错误来自以下行：

ResponseEntity ResponseEntity=restTemplate.getForEntity（url2，DataModel[].class）

看起来响应不是

数据模型的数组

是，它不是数组。尝试DataModel[].class而不是DataModel.classEverything。谢谢你的帮助。我还能做什么？

com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `[Lio.github.DataModel;` out of START_OBJECT token
 at [Source: (PushbackInputStream); line: 1, column: 1]

@GetMapping("/3")
    public String getCostam() {
        RestTemplate rest = new RestTemplate();

        ResponseEntity<DataModel> responseEntity = restTemplate.getForEntity(url2, DataModel.class);

        MediaType contentType = responseEntity.getHeaders().getContentType();
        HttpStatus statusCode = responseEntity.getStatusCode();

        System.out.println(responseEntity
                .getBody().getFeatures());



        return statusCode.toString();

    }

 @Override
    public String toString() {
        return properties.getPlace();
    }