Spring验证@NotNull不验证

Question

我正在尝试使用Spring Validator验证POST请求。这是我正在尝试验证的对象：

@Validated
public class Request implements Serializable {
    private static final long serialVersionUID = 1L;

    private Long id1;
    private Long id2;   
    private String s;   
    private List<Mapping> mappings;

    public Request() {}
    public Request (Long id1, Long id2, String s, List<Mapping> mappings) {
        this.id1 = id1;
        this.id2 = id2;
        this.s = s;
        this.mappings = mappings;
    }

    //getter() and setter() methods.
}

这是Mapping类：

@Validated
public class Mapping implements Serializable {
    private static final long serialVersionUID = 1L;
    @JsonProperty(value="id")
    private Long id;

    @JsonProperty(value="string")
    private String string;

    @JsonProperty(value="account_id")
    @NotNull
    private String accountId;

    @JsonProperty(value="last_updated_at")
    @NotNull    
    private OffsetDateTime lastUpdatedAt;

    // Getter and setters()
    // I'll skip the getter() and setter() for id and string fields.
    @Override
    public String getAccountId() {
        return accountId;
    }

    @Override
    public void setAccountId (@NotNull String accountId) {
        this.accountId = accountId;
    }

    @Override
    public OffsetDateTime getLastUpdatedAt() {
        return lastUpdatedAt;
    }

    @Override
    public void setLastUpdatedAt(@NotNull OffsetDateTime lastUpdatedAt) {
        this.lastUpdatedAt = lastUpdatedAt;
    }
}

这是正在发布的消息：

[Request [id1=null, id2=null, s=6eq2J6, mappings=

[Mapping [id=2779, string=6eq2J6, accountId=null, lastUpdatedAt=null]]]]

这就是我接收请求的方式，但是bindingResult.hasErrors()总是空的。pushRequest与发送时完全相同。

@RestController
@RequestMapping(value="/${path}", method={RequestMethod.GET, RequestMethod.POST, RequestMethod.PUT})
@Validated
public class MappingController {

@PostMapping(value="/", consumes={"application/json"})
public void processMappings (@Valid @RequestBody Optional<Request> pushRequest, BindingResult bindingResult) {
    if (bindingResult.hasErrors()) {
        log.info("Error!");
    }
}
}

当accountId和lastUpdatedAt的@NotNull具有Null值时，为什么它们不会使验证失败？

我试图通过搜索这个错误来找到解决方案，解决方案是将@Validated添加到Request, Mapping and MappingController类中，但这并没有解决问题。

另一种解决方案是将这些Beans添加到Main()类中，但这并没有解决问题。

public class Main {
    public static void main(String[] args) {        
        SpringApplication.run(Main.class, args);        
        //System.out.println("version: " + SpringVersion.getVersion()); // version: 5.1.0.RC1
    }

    @Bean
    public javax.validation.Validator localValidatorFactoryBean() {
       return new LocalValidatorFactoryBean();
    }

    @Bean
    public MethodValidationPostProcessor methodValidationPostProcessor() {
                MethodValidationPostProcessor mvProcessor = new MethodValidationPostProcessor();
                mvProcessor.setValidator(validator());
                return mvProcessor;
    }

    @Bean
    public LocalValidatorFactoryBean validator() {
                    LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
                    validator.setProviderClass(HibernateValidator.class);
                    validator.afterPropertiesSet();
                    return validator;
    }
}

Answer 1

多亏了这篇文章，我想我找到了答案：

jsr-303-valid-annotation-nested-object-not-working

所以只要我将@Valid添加到这些字段中：

@Valid
private List<Mapping> mappings;

以及Mapping中的以下字段：

@JsonProperty(value="account_id")
    @Valid
    @NotNull
    private String accountId;

    @JsonProperty(value="last_updated_at")
    @Valid
    @NotNull    
    private OffsetDateTime lastUpdatedAt;

验证已开始工作。

我还删除了setter()方法中的@NotNull：

Setters()如下所示：

@Override
    public void setAccountId (String accountId) {
        this.accountId = accountId;
    }    

    @Override
    public void setLastUpdatedAt(OffsetDateTime lastUpdatedAt) {
        this.lastUpdatedAt = lastUpdatedAt;
    }

此外，我的代码在没有添加到Main()中的任何Validator bean的情况下也可以工作。

Answer 2

在我的例子中，我缺少验证依赖项。来自baeldung；

Starting with Boot 2.3, we also need to explicitly add the spring-boot-starter-validation dependency:

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