For example:
public class MyBean {
@MyValidationAnnotation
private String whatever;
...
}
@Component
public class MyConstraintValidator
implements ConstraintValidator<MyValidationAnnotation, String> {
@Autowired
private SomeSpringBean whatever;
@Override
public boolean isValid(String value, ConstraintValidatorContext context) {
...
whatever.doSomething()
...
}
...
}
Using it in a controller like this works fine:
@Controller
public class MyController {
@RequestMapping(...)
public String whatever(@RequestBody @Validated MyBean bean) {
...
}
}
But in the data access layer it throws NPE:
@Autowired
private MyBeanRepository repository;
...
MyBean bean = ...
repository.save(bean); // throws NPE at whatever.doSomething()
That is because MyConstraintValidator instance was outside of the Spring's container in the second place.
So how to implement and/or configure a validator working well both in a controller and in the data access layer? (I'm using Hibernate + Spring Data JPA for it)
