Spring Boot：没有从字符串值反序列化的字符串参数构造函数/工厂方法

Question

我正在尝试使用 RestTemplate (Spring Boot) 读取来自休息服务的响应：

RestTemplate restTemplate = new RestTemplate();
ResponseEntity<RMSendPropertyResponse> response = restTemplate.exchange("https://url", HttpMethod.POST, entity, RMSendPropertyResponse.class);
RMSendPropertyResponse rmResponse = response.getBody();

但是当响应中出现错误数组时：

{
    "message": "Something failed.",
    "success": false,
    "errors": [
        {
            "error_code": "MND_00026",
            "error_value": "",
            "error_description": "field not present"
        },
        {
            "error_code": "VAL_00039",
            "error_value": "0",
            "error_description": "Wrong field"
        }
    ],
    "warnings": null,
    "request_timestamp": "18-07-2017 11:34:46",
    "response_timestamp": "18-07-2017 11:34:46"
}

我总是收到这个错误：

2017-07-18 12:29:08.220 警告 9489 --- [nio-8080-exec-9] .w.s.m.s.DefaultHandlerExceptionResolver : 无法读取 HTTP 信息： org.springframework.http.converter.HttpMessageNotReadableException： 无法读取文档：无法构造实例 co.easymatch.portals.rightmove.entities.RMError：没有字符串参数 从字符串值反序列化的构造函数/工厂方法 ('MND_00026') 在 [来源：java.io.PushbackInputStream@77f5bb5f;线： 1、栏目：532]（通过引用链： co.portals.entities.RMSendPropertyResponse["errors"]->java.util.ArrayList[0]); 嵌套异常是 com.fasterxml.jackson.databind.JsonMappingException：无法构造 co.portals.entities.RMError 的实例：没有字符串参数 从字符串值反序列化的构造函数/工厂方法 ('MND_00026') 在 [来源：java.io.PushbackInputStream@77f5bb5f;线： 1、栏目：532]（通过引用链： co.portals.entities.RMSendPropertyResponse["errors"]->java.util.ArrayList[0])

我的课是……

RMSendPropertyResponse 类：

@JsonIgnoreProperties(ignoreUnknown = true)
public class RMSendPropertyResponse extends RMResponse {
    private RMPropertyResponse property;
    private List<RMWarning> warnings;
    private List<RMError> errors;

    public RMSendPropertyResponse() {
    }

    public RMPropertyResponse getProperty() {
        return property;
    }

    public void setProperty(RMPropertyResponse property) {
        this.property = property;
    }

    public List<RMWarning> getWarnings() {
        return warnings;
    }

    public void setWarnings(List<RMWarning> warnings) {
        this.warnings = warnings;
    }

    public List<RMError> getErrors() {
        return errors;
    }

    public void setErrors(List<RMError> errors) {
        this.errors = errors;
    }
}

RMError 类：

@JsonIgnoreProperties(ignoreUnknown = true)
public class RMError {
    private String error_code;
    private String error_description;
    private String error_value;

    public RMError() {
    }

    public String getError_code() {
        return error_code;
    }

    public void setError_code(String error_code) {
        this.error_code = error_code;
    }

    public String getError_description() {
        return error_description;
    }

    public void setError_description(String error_description) {
        this.error_description = error_description;
    }

    public String getError_value() {
        return error_value;
    }

    public void setError_value(String error_value) {
        this.error_value = error_value;
    }
}

我不明白为什么没有构造函数/工厂方法来反序列化字符串值。

谢谢

Answer 1

您的代码对我有用。 您使用的spring-boot 是什么版本？你自己管理jackson的版本吗？如果是这样，您使用的是什么版本。 您确定从您调用的外部 url 获得的响应是​​您粘贴在问题中的内容吗？ 这是我复制的工作代码：

@RestController
public class MyController {  

 @GetMapping(value = "/read", produces = MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity read() {
    RestTemplate restTemplate = new RestTemplate();
    ResponseEntity<RMSendPropertyResponse> response = restTemplate.exchange("http://localhost:8080/", HttpMethod.GET, null, RMSendPropertyResponse.class);
    RMSendPropertyResponse rmResponse = response.getBody();
    return new ResponseEntity<>(rmResponse, HttpStatus.CREATED);

}

@GetMapping(value = "/", produces = MediaType.APPLICATION_JSON_VALUE)
public String get() {
    return "{\n" +
            "    \"message\": \"Something failed.\",\n" +
            "    \"success\": false,\n" +
            "    \"errors\": [\n" +
            "        {\n" +
            "            \"error_code\": \"MND_00026\",\n" +
            "            \"error_value\": \"\",\n" +
            "            \"error_description\": \"field not present\"\n" +
            "        },\n" +
            "        {\n" +
            "            \"error_code\": \"VAL_00039\",\n" +
            "            \"error_value\": \"0\",\n" +
            "            \"error_description\": \"Wrong field\"\n" +
            "        }\n" +
            "    ],\n" +
            "    \"warnings\": null,\n" +
            "    \"request_timestamp\": \"18-07-2017 11:34:46\",\n" +
            "    \"response_timestamp\": \"18-07-2017 11:34:46\"\n" +
            "}";
  }

}

@JsonIgnoreProperties(ignoreUnknown = true)
class RMError {
    private String error_code;
    private String error_description;
    private String error_value;

    public RMError() {
    }

    public String getError_code() {
        return error_code;
    }

    public void setError_code(String error_code) {
        this.error_code = error_code;
    }

    public String getError_description() {
        return error_description;
    }

    public void setError_description(String error_description) {
        this.error_description = error_description;
    }

    public String getError_value() {
        return error_value;
    }

    public void setError_value(String error_value) {
        this.error_value = error_value;
    }
}

@JsonIgnoreProperties(ignoreUnknown = true)
class RMSendPropertyResponse {

    private List<RMError> errors;

    public RMSendPropertyResponse() {
    }

    public List<RMError> getErrors() {
        return errors;
    }

    public void setErrors(List<RMError> errors) {
        this.errors = errors;
    }
}