Java – Autowired gives a null value in the custom constraint validator

I'm new to spring, and I've found answers to some questions on so Here are the links:

Spring 3.1 Autowiring does not work inside custom constraint validator

Autowiring a service into a validator

Autowired Repository is Null in Custom Constraint Validator

I have a spring project in which I want to use hibernate validator for object validation Based on what I read online and some forums, I try to inject validators as follows:

@Bean
  public Validator validator() {
    return new LocalValidatorfactorybean().getValidator();
  }

But wherever I use it

@Autowired
Validator validator;

It adopts the verifier implementation of spring instead of hibernate I couldn't figure out how to accurately inject the hibernate validator and simply assemble it into other classes automatically, so I used a cheap technique, and now my java config looks like this

@Bean
      public Validator validator() {
        // ValidatorImpl is Hibernate's implementation of the Validator
        return new ValidatorImpl();
      }

(I really appreciate it if someone can point out how I can avoid getting the right direction of Hibernate validator in this Hacky way)

But let's look at the main problems:

This is a custom validation definition

@Target( { METHOD,FIELD,ANNOTATION_TYPE,CONSTRUCTOR,PARAMETER } )
@Retention(RUNTIME)
@Constraint(validatedBy = EmployeeValidator.class)
@Documented
public @interface EmployeeValidation {
String message() default "{constraints.employeeConstraints}";
public abstract Class<?>[] groups() default {};
public abstract Class<? extends Payload>[] payload() default {};
}

My custom validator

public class EmployeeValidator implements ConstraintValidator<EmployeeValidation,Object> {

@Autowired
private EmployeeService employeeService;

@Override
public void initialize(EmployeeValidation constraintAnnotation) {
//do Something
 }

@Override
public boolean isValid(String type,ConstraintValidatorContext context) {
    return false;
}
}

In the custom constraint validator above, I get employeeservice null I know that spring does not instantiate any implementation of constraintvalidator at startup, but I think adding validatorimpl () will actually solve this problem But this is not the case

Now I'm stuck in a very Hacky solution, and I don't want to continue such code Someone can help me solve my situation

Attachment: These are my imports in Java config file:

import org.hibernate.validator.HibernateValidator; 
import org.springframework.beans.factory.annotation.Autowired; 
import org.springframework.context.MessageSource; 
import org.springframework.context.annotation.Bean; 
import org.springframework.context.annotation.ComponentScan; 
import org.springframework.context.annotation.Configuration; 
import org.springframework.context.annotation.PropertySource; 
import org.springframework.context.support.ReloadableResourceBundleMessageSource; 
import org.springframework.core.env.Environment; 
import org.springframework.validation.Validator; 
import org.springframework.validation.beanvalidation.LocalValidatorfactorybean; 
import org.springframework.web.servlet.LocaleResolver; 
import org.springframework.web.servlet.ViewResolver; 
import org.springframework.web.servlet.config.annotation.EnableWebMvc; 
import org.springframework.web.servlet.config.annotation.InterceptorRegistry; 
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport; 
import org.springframework.web.servlet.i18n.CookieLocaleResolver; 
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor; 
import org.springframework.web.servlet.view.InternalResourceViewResolver;

Solution

I hope the solution can help someone:

@Bean
public Validator validator () {

    ValidatorFactory validatorFactory = Validation.byProvider( HibernateValidator.class )
        .configure().constraintValidatorFactory(new SpringConstraintValidatorFactory(autowireCapablebeanfactory))
        .buildValidatorFactory();
    Validator validator = validatorFactory.getValidator();

    return validator;
}

Initialize the validator using the spring constraintvalidatorfactory to inject work and provide the validator implementation as hibernate Class works in the following ways:

>Your project will be verified by the library of your choice > your custom verifier will be able to use the functions of spring and perform verification through hibernate

How this works: Hibernate's constraintvalidatorfactory does not initialize any constraintvalidators unless they are called, but spring constraintvalidatorfactory implements it by providing it with autowirecapablebeanfactory

As mentioned in @ shabyaschi's comment, to inject autowirecapablebeanfactory, you can change the method signature to:

Validator validator(final AutowireCapablebeanfactory autowireCapablebeanfactory) {

Or add getters and setters to it in the configuration file, as shown below:

public AutowireCapablebeanfactory getAutowireCapablebeanfactory() {
        return autowireCapablebeanfactory;
}

public void setAutowireCapablebeanfactory(AutowireCapablebeanfactory autowireCapablebeanfactory) {
        this.autowireCapablebeanfactory = autowireCapablebeanfactory;
}