spring boot应用程序中bean验证失败时未得到正确响应

Question

我使用的是spring boot 2.0.6、hibernate Validator6.0、validation-api 2.0和apache CXF。我在controler方法中使用了@Valid注释，然后在bean属性中设置了@NotNull、@Email和适当的消息。然后我创建了一个CustomExceptionHandler来处理MethodArgumentNotValideXception。当邮递员测试它时，我没有得到正确的响应与我的验证消息。

UserController.Class

@Path("/user")
@Component
public class UserController {

@POST
@Path("/register")
@Consumes(MediaType.APPLICATION_JSON_VALUE)
@Produces(MediaType.APPLICATION_JSON_VALUE)
public Response registerUser(@Valid User user) {

    String status = "";

    Boolean isEmailIdExist = UserAuthService.checkUserByMailId(user.getEmail());
    Boolean isUserNameExist = UserAuthService.checkUserByUserName(user.getUserName());

    if(!isEmailIdExist) {
        if(!isUserNameExist) {
            status = UserAuthService.registerUser(user);
        }else {
            status = "Username already taken. Try with different name";
        }
    }else {
        status = "Email ID already exist";
    }

    return Response.ok(status).build();
}
}

user.class

@Entity
@Table(name = "USER")
public class User {

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "UID")
private int userId;

@NotBlank(message = "Please provide first name")
@Column(name = "FIRST_NAME", length = 50)
private String firstName;

@NotBlank(message = "Please provide email")
@Column(name = "EMAIL", length = 100, unique = true)
@Email(message = "Please provide a valid email")
private String email;}

getter/setter
}

CustomExceptionHandler.java

@ControllerAdvice
@Component
public class CustomExceptionHandler extends ResponseEntityExceptionHandler {

@ExceptionHandler(Exception.class)
public final ResponseEntity<Object> handleAllExceptions(Exception ex, WebRequest request) {
    ErrorDetails errorDetails = new ErrorDetails(new Date(), ex.getMessage(), request.getDescription(false));
    return new ResponseEntity<Object>(errorDetails, HttpStatus.INTERNAL_SERVER_ERROR);
}

@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
        HttpHeaders headers, HttpStatus status, WebRequest request) {
    ErrorDetails errorDetails = new ErrorDetails(new Date(), "Validation Failed", ex.getBindingResult().toString());
    return new ResponseEntity<Object>(errorDetails, HttpStatus.BAD_REQUEST);
}
}

Json结构

{
    "firstName":"",
    "email":"[e-mail]",
}

Answer 1

如果您遇到了例如：无法看到返回到客户端的验证错误（默认消息）的问题，您可以这样做：

顶级解决方案1：简单地添加devtools。这应该可以解决问题。在我这样做之后，所有的绑定结果都返回给了客户机。我建议您首先测试一下：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
</dependency>

解决方案二：

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

server.error.include-message=always
server.error.include-binding-errors=always

解决方案3：（在我发现解决方案2之前，它也可能有帮助）

所以我发现这是因为有了Spring Boot2.3+。但在Spring BootV2.3+中，我找不到关于@valid新更新用法的警告消息。

因此，我最终切换回SpringBootV2.2.10(2.2的最新版本），方法是调整pom.xml文件中的发行版本，如下所示：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.10.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>