我有一些UserService在User实体上进行操作。 我创建了自己的注释和ConstraintValidator类作为实现
我需要将UserService注入ConstraintValidator。并且,正如Spring文档所说,在注册bean之后:
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
SpringConstraingValidatorFactory默认注册,因此我可以轻松地@Autowired我的服务。 (来源:http://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/html/validation.html#validation-beanvalidation-spring-constraints)
不幸的是,它不起作用。我在字段上接受了带有NullPointerException的stacktrace(在实现ConstraintValidator的类中):
@Autowired
private UserService userService; //here
以及对服务的调用
@Override
public boolean isValid(String username, ConstraintValidatorContext constraintValidatorContext) {
personService.doSomethingWithService(); //here
return true;
}
这意味着,UserService未正确注入。我也尝试使用ApplicationContextAware - 在我的ConstraintValidator类中实现它,获取上下文并找到bean:
(UserService) context.getBean("userService");
但它也没有帮助..我不知道我的代码有什么问题。最后,stacktrace包含很多异常,包括NullPointer和RollbackException。
java.lang.NullPointerException
com.reportme.model.validation.UsernameAvailableValidator.isValid(UsernameAvailableValidator.java:20)
com.reportme.model.validation.UsernameAvailableValidator.isValid(UsernameAvailableValidator.java:9)
org.hibernate.validator.internal.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:308)
org.hibernate.validator.internal.engine.ConstraintTree.validateConstraints(ConstraintTree.java:180)
org.hibernate.validator.internal.engine.ConstraintTree.validateConstraints(ConstraintTree.java:124)
org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:85)
org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:463)
//...
org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:526)
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:757)
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:726)
//...
javax.persistence.RollbackException: Error while committing the transaction
org.hibernate.jpa.internal.TransactionImpl.commit(TransactionImpl.java:94)
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517)
如果有必要,我会使用Spring 4,非常感谢您的帮助,谢谢!
答案 0 :(得分:-1)
我的环境是spring-boot,下面带有org.springframework.stereotype.Component
注释的代码到我的验证类正在运行,FYR。
@Component
public class FooValidator implements ConstraintValidator<Foo, Object> {
@Autowired
MyService service;
@Override
public void initialize(Foo constraintAnnotation) {
}
@Override
public boolean isValid(Object value, ConstraintValidatorContext context) {
return service.isValid(value);
}
}