我有一些UserService对User实体进行操作。 我创建了我自己的注释和ConstraintValidator类作为实现如何将(@Autowired)@Service注入ConstraintValidator?
我需要将该UserService注入ConstraintValidator。而且,随着春天的文档说,登记后豆:
<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
SpringConstraingValidatorFactory默认情况下注册,所以我可以很容易地@Autowired我的服务进去。 (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,它不适合我。我收到与NullPointerException异常堆栈跟踪的领域(内实现ConstraintValidator类):
@Autowired
private UserService userService; //here
,并在调用服务
@Override
public boolean isValid(String username, ConstraintValidatorContext constraintValidatorContext) {
personService.doSomethingWithService(); //here
return true;
}
因此,这意味着,该UserService不能正常喷射。我也曾尝试使用了ApplicationContextAware - 实现它在我的ConstraintValidator类,获取上下文并找到豆:
(UserService) context.getBean("userService");
但它也没有帮助。我不知道这有什么错我的代码。最后,stacktrace包含很多例外,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)
我使用Spring 4如果有必要,将非常感激的帮助,谢谢!
我正在使用弹簧引导1.4.1。而且,我使用相同的代码,但服务仍然为空。 – BeeNoisy