java 自定义bean验证器不自动连接服务

wecizke3  于 2023-05-12  发布在  Java
关注(0)|答案(2)|浏览(133)

我有点不知道我错过了什么，我有以下自定义bean验证器代码：

import jakarta.validation.Payload;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Constraint(validatedBy=UniqueCarBrandNameValidator.class)
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface UniqueCarBrandName {
    String message() default "Email address is already registered";
    Class<?>[] groups() default { };
    Class<? extends Payload>[] payload() default { };
}
import icodeit.carfleetmanager.service.CarBrandService;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class UniqueCarBrandNameValidator implements ConstraintValidator<UniqueCarBrandName, String> {

    @Autowired
    private CarBrandService carBrandService;

    @Override
    public boolean isValid(String name, ConstraintValidatorContext constraintValidatorContext) {
        return carBrandService.fetchOneByName(name).isEmpty();
    }
}

简而言之，我需要一个服务来查看我的CarBrandName是否唯一，我试图在自定义验证器注解中实现这一点。问题是自定义验证器中的自动连接不起作用，服务为空，给了我一个NPE，但服务在我的控制器中自动连接工作正常。根据文档，我已包括以下配置：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.validation.Validator;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;
import org.springframework.validation.beanvalidation.MethodValidationPostProcessor;

@Configuration
public class AppConfig {

    // Used for auto wiring beans in validation classes
    @Bean
    public Validator validator() {
        return new LocalValidatorFactoryBean();
    }

    @Bean
    public MethodValidationPostProcessor validationPostProcessor() {
        return new MethodValidationPostProcessor();
    }
}

以便Spring上下文在定制验证器中也可用。但是没有用。我也尝试了这个stackoverflow thread中提出的解决方案，但没有一个有效。
我使用以下maven配置：

?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>icodeit</groupId>
    <artifactId>service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service</name>
    <description>backend service</description>
    <properties>
        <java.version>17</java.version>
        <jackson-hibernate.version>2.15.0-rc2</jackson-hibernate.version>
        <org.mapstruct.version>1.5.4.Final</org.mapstruct.version>
        <lombok-mapstruct-binding.version>0.2.0</lombok-mapstruct-binding.version>
        <lombok.version>1.18.24</lombok.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.liquibase</groupId>
            <artifactId>liquibase-core</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct</artifactId>
            <version>${org.mapstruct.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok-mapstruct-binding</artifactId>
            <version>${lombok-mapstruct-binding.version}</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

相关错误消息：

java.lang.NullPointerException: Cannot invoke "icodeit.carfleetmanager.service.CarBrandService.fetchOneByName(String)" because "this.carBrandService" is null
    at icodeit.carfleetmanager.validation.carbrand.UniqueCarBrandNameValidator.isValid(UniqueCarBrandNameValidator.java:17) ~[classes/:na]
    at icodeit.carfleetmanager.validation.carbrand.UniqueCarBrandNameValidator.isValid(UniqueCarBrandNameValidator.java:9) ~[classes/:na]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateSingleConstraint(ConstraintTree.java:180) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.SimpleConstraintTree.validateConstraints(SimpleConstraintTree.java:66) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:75) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.metadata.core.MetaConstraint.doValidateConstraint(MetaConstraint.java:130) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:123) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateMetaConstraint(ValidatorImpl.java:555) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForSingleDefaultGroupElement(ValidatorImpl.java:518) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:488) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:450) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:400) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:172) ~[hibernate-validator-8.0.0.Final.jar:8.0.0.Final]
    at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:125) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:80) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.action.internal.EntityIdentityInsertAction.preInsert(EntityIdentityInsertAction.java:184) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:74) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:653) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:283) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:264) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:322) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:340) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:286) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:192) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:122) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:184) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:129) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:53) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:107) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:737) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:721) ~[hibernate-core-6.1.7.Final.jar:6.1.7.Final]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]

编辑：我已经尝试过通过构造函数注入，就像ananta的回答中建议的那样，但遗憾的是我得到了以下错误：

java.lang.NoSuchMethodException: icodeit.carfleetmanager.validation.carbrand.UniqueCarBrandNameValidator.<init>()
    at java.base/java.lang.Class.getConstructor0(Class.java:3585) ~[na:na]
    at java.base/java.lang.Class.getConstructor(Class.java:2271) ~[na:na]
Java

2条答案

按热度按时间
tf7tbtn2

tf7tbtn21#

您可以尝试使用@AllArgsConstructor注入CarBrandService，而不是@Autowire。使用这种方式，bean容器将必须确保您的CarBrandService在创建UniqueCarBrandNameValidator之前已经存在，否则，它将在启动时中断。

@Component
@AllArgsConstructor // Add this
public class UniqueCarBrandNameValidator implements ConstraintValidator<UniqueCarBrandName, String> {

    // @Autowired => Remove this
    private CarBrandService carBrandService;
    ...
}
赞(0）分享  回复(0）举报  2023-05-12
1l5u6lss

1l5u6lss2#

我想我找到了一个可能的解决方案，同时尝试了一些事情。如果您使用另一种方法，通过使用Jakarta注入的Validator在服务中验证您的实体，然后看到您的实体在提交到JPA存储库时没有验证，那么它就可以工作：

@AllArgsConstructor
@Component
public class CarBrandService {

    private final CarBrandRepository carBrandRepository;
    private final Validator validator;
...
    private void validate(CarBrand carBrand) {
        // This works!!
        Set<ConstraintViolation<CarBrand>> constraintViolations = validator.validate(carBrand);
        if (!customConstraintVoilations.isEmpty() || !constraintViolations.isEmpty()) {
            throw new CustomConstraintViolationException(customConstraintVoilations, constraintViolations);
        }
    }
...

现在唯一的问题是，在保存它再次将得到验证，在这种情况下，它将再次抛出NPE错误。您可以通过在实体之外的另一个对象上执行验证来解决这个问题。

赞(0）分享  回复(0）举报  2023-05-12
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