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How to introduce (@Autowired) @Service in ConstraintValidator?

I have some UserService that performs operations on a User object. I created my own annotation and the ConstraintValidator class as an implementation

I need this UserService to be introduced in ConstraintValidator. And, as the docs of spring say, after registering the bean:

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>

SpringConstraingValidatorFactory is registered by default, so I can easily @Autowired my service. (source: http://docs.spring.io/spring/docs/3.1.x/spring-framework-reference/html/validation.html#validation-beanvalidation-spring-constraints )

Unfortunately, this does not work for me. I get a stacktrace with a NullPointerException in a field (inside a class that implements ConstraintValidator):

@Autowired
private UserService userService; //here

and when calling the service

@Override
public boolean isValid(String username, ConstraintValidatorContext constraintValidatorContext) {
    personService.doSomethingWithService(); //here
    return true;
}

, , UserService . ApplicationContextAware - ConstraintValidator, bean:

(UserService) context.getBean("userService");

.. , . , , stacktrace, , NullPointer 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)

spring 4, , !

+4
1

spring -boot, org.springframework.stereotype.Component , 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);
  }
}
-1

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