I try to run the project (using SpringWebMVC) with the error:

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘javax.validation.Validator‘ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

My project is “stuck” with no bean to inject into the beanValidator instance – the place I highlighted below – and I don’t know how to fix it. I thought this bean – javax.validation.Validator – is provided by Spring, no need to specify manually similar to
@Autowired
private org.springframework.core.env.Environment env;

Here is my code:

import com.busplanner.pojo.Users;
import java.util.HashSet;
import java.util.Set;
import javax.validation.ConstraintViolation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;

@Component
public class WebAppValidator implements Validator {

    **@Autowired
    private javax.validation.Validator beanValidator;**
    
    private Set<Validator> springValidators = new HashSet<>();

    @Override
    public boolean supports(Class<?> clazz) {
        return Users.class.isAssignableFrom(clazz);
    }

    @Override
    public void validate(Object target, Errors errors) {
        Set<ConstraintViolation<Object>> constraintViolations = beanValidator.validate(target);
        for (ConstraintViolation<Object> obj : constraintViolations) {
            errors.rejectValue(
                    obj.getPropertyPath().toString(),
                    obj.getMessageTemplate(),
                    obj.getMessage());
        }
        
        for (Validator obj : springValidators) {
            obj.validate(target, errors);
        }
    }
    
    public void setSpringValidators(Set<Validator> springValidators) {
        this.springValidators = springValidators;
    }
}

And WebApplicationContext

@Configuration
@EnableWebMvc
@EnableTransactionManagement
@ComponentScan(basePackages = {
    "com.busplanner.controllers",
    "com.busplanner.repositories",
    "com.busplanner.services",
    "com.busplanner.component",
    "com.busplanner.validator",
    
})
public class WebApplicationContext implements WebMvcConfigurer {

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }


    @Bean
    public MessageSource messageSource() {
        ResourceBundleMessageSource resource = new ResourceBundleMessageSource();
        resource.setBasenames("beanValidator", "webapp");
        return resource;
    }

    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addFormatter(new BusFormatter());
        registry.addFormatter(new RouteFormatter());
    }

    
    @Bean(name = "validator")
    public LocalValidatorFactoryBean validator() {
        LocalValidatorFactoryBean bean = new LocalValidatorFactoryBean();
        bean.setValidationMessageSource(messageSource());
        return bean;
    }

    @Override
    public Validator getValidator() {
        return validator();
    }


   
    @Bean
    public WebAppValidator applicationValidator() {
        Set<Validator> springValidators = new HashSet<>();
        springValidators.add(new UsernameValidator());

        WebAppValidator validator = new WebAppValidator();
        validator.setSpringValidators(springValidators);
        return validator;
    }
    
    @Override 
    public  void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter jsonConverter = new MappingJackson2HttpMessageConverter();
        jsonConverter.setSupportedMediaTypes(Collections.singletonList(MediaType.APPLICATION_JSON));
        converters.add(jsonConverter);
    }

}

And pom.xml

        <dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>6.1.5.Final</version>
        </dependency>