Spring Boot接口报Failed to read request请求解析失败求助

使用Swagger或Postman调用Spring Boot的/lineinpolygon接口时，收到“Failed to read request”响应，代码从未进入断点。相关代码和请求JSON如下：

Controller代码 #

@PostMapping(value = "/lineinpolygon", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
@Operation(summary = "Is line within polygon.", description = "Is line within polygon. Give the id for the for the polygon and a track to check. The geometry format should be Lon, Lat, Alt.  The SRID for the geometries use 4326.", responses = {
        @ApiResponse(responseCode = "200", description = "Success", content = {
                @Content(mediaType = "application/json", schema = @Schema(implementation = WithinPolygonResponse.class))
        }),
        @ApiResponse(responseCode = "400", description = "An error occurred while getting if line is within polygon.")
})
public ResponseEntity<WithinPolygonResponse> getLineWithinPolygon(@RequestBody LineWithinRequestID entity) {
        try {
                Optional<Integer>opSrid = Optional.ofNullable(entity.getSrid()) ;
                boolean match = myService.isLineContainedInPolygon(entity.getId(),entity.getCoordinateList(), opSrid.orElse(4326));

                return ResponseEntity.ok(new WithinPolygonResponse(match));
        } catch (Exception exc) {
                throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "Get line Within polygon error.", exc);
        }
}

LineWithinRequestID实体类 #

@Getter
@Setter
@Data
@NoArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class LineWithinRequestID {

    @JsonProperty("id")
    private Long id;

    @JsonProperty("srid")
    private Integer srid;

    @JsonProperty("coordinates")
    private List<List<Double>> coordinateList;
}

WithinPolygonResponse实体类 #

@Getter
@Setter
@Data
@NoArgsConstructor
@AllArgsConstructor
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonIgnoreProperties(ignoreUnknown = true)
public class WithinPolygonResponse {

    @JsonProperty("status")
    private Boolean status;
}

请求JSON #

{
  "id": 2,
  "srid": 4326,
  "coordinates": [
    [
      [-77.292894, 38.392816, 0], [-77.169498, 38.468925, 0], [-77.204214, 38.568971, 0]
    ]
  ]
}

核心问题是请求JSON的coordinates结构和实体类定义不匹配：

• 实体类中coordinateList定义为List<List<Double>>，对应JSON应该是[[x1,y1,z1], [x2,y2,z2], ...]的两层数组结构，用来表示一条线的多个坐标点。
• 但你提供的请求JSON里，coordinates多嵌套了一层，变成了三层数组[[[x1,y1,z1], [x2,y2,z2], ...]]，Jackson无法将三层数组解析为两层的List结构，导致请求解析失败，直接返回400错误，代码自然进不了断点。

修复步骤： #

1. 修正请求JSON，去掉coordinates外层多余的数组：

{
  "id": 2,
  "srid": 4326,
  "coordinates": [
    [-77.292894, 38.392816, 0], 
    [-77.169498, 38.468925, 0], 
    [-77.204214, 38.568971, 0]
  ]
}

2. （可选）如果业务逻辑确实需要三层数组结构，需修改实体类的coordinateList定义为List<List<List<Double>>>，同时调整Service层的处理逻辑，但从接口描述来看，两层数组更符合“线的坐标点”的业务场景。

额外排查建议： #

• 开启Spring Boot请求日志，查看详细解析错误：在application.yml中添加配置，能直接看到Jackson解析失败的具体原因，方便快速定位问题：

logging:
  level:
    org.springframework.web: DEBUG

• 使用Swagger时，直接用实体类生成的请求示例测试，避免手动构造JSON时出现结构错误。

内容的提问来源于stack exchange，提问作者user398482