How to validate Spring Boot Rest response?

user_5962766 0
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I have controller implemented with Spring Boot Rest:

@RestController
@RequestMapping("/example")
public class ExampleController {

    @Autowired
    private ExampleService exampleService;

    @GetMapping("/{id}")
    public ExampleResponse getExample(@NotNull @PathVariable("id") String id) {
        return exampleService.getExample(id);
    }
}

And response DTO:

public class ExampleResponse {

    @NotNull
    private String id;

    @NotNull
    private String otherStuff;

    // setters and getters
}

Response body is not validated. I have annotated it with @Valid but null values still pass. Request validation works well.

How to validate response body?

spring-rest spring-boot validation spring java
5 Answers

Use @Validated on Rest Controller and @Valid on the method for which the return object has to be validated. For Example:

RestController:

@RestController
@RequestMapping("/tasks")
@Validated
public class TaskController {

    @GetMapping("/{taskId}")
    @Valid
    public TaskDTO getTask(@PathVariable UUID taskId) {
        return convertToDto(taskService.findById(taskId));
    }  

}

DTO class:

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@ValidTaskDTO
public class TaskDTO {

    @FutureOrPresent
    @NotNull
    private ZonedDateTime dueDate;

    @NotBlank(message = "Title cannot be null or blank")
    private String title;

    private String description;

    @NotNull
    private RecurrenceType recurrenceType;

    @Future
    @NotNull
    private ZonedDateTime repeatUntil;

}

My return object TaskDTO has null dueDate and repeatUntil. So the error message will be as shown below:

{
  "timestamp": "2021-01-20T11:09:37.303929",
  "status": 400,
  "error": "Bad Request",
  "message": "getTask.<return value>.dueDate: must not be null, getTask.<return value>.repeatUntil: must not be null",
  "path": null
}

I hope this helps. For details on custom class level constraint, have a look at this video.

user_149896780
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