Question

如果将@Cacheable用于返回值'ResponseEntity'，则会出现序列化错误。

Caused by: org.springframework.data.redis.serializer.SerializationException: Cannot serialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable payload but received an object of type [org.springframework.http.ResponseEntity]

演示：

@Controller
@CacheConfig(cacheNames = "logs")
public class LogController {
  @Cacheable(key = "#id")
  @RequestMapping(value = LogConstants.LOGS_ID_PATH, method = RequestMethod.GET)
  public ResponseEntity<Log> findById(@PathVariable Long id) {
   //....
  }
}

Answer 1

缓存对象应为Serializable，但ResponseEntity不是Serializable。

您可以在不同级别添加缓存，因此可以使返回类型可序列化或添加一些能够保存ResponseEntity的客户序列化器/反序列化器

Answer 2

您需要像这样序列化您的ResponseEntity：

public CustomeResponseEntity extends ResponseEntity implements Serializable {

    private static final long serialVersionUID = 7156526077883281625L;

    public CustomResponseEntity(HttpStatus status) {
        super(status);
    }

    public CustomResponseEntity(Object body, HttpStatus status) {
        super(body, status);
    }

    public CustomResponseEntity(MultiValueMap headers, HttpStatus status) {
        super(headers, status);
    }

    public CustomResponseEntity(Object body, MultiValueMap headers, HttpStatus status) {
        super(body, headers, status);
    }
}

然后它将起作用。

return new CustomResponseEntity(resultDTO, HttpStatus.OK);

spring web ResponseEntity无法序列化

2 个答案: