Injection in custom Validator return null

Question

I have already looked in stackoverflow and other websites but found nothing which worked for me.

(Spring boot 3)

Log : Resolved [jakarta.validation.ValidationException: HV000028: Unexpected exception during isValid call.]

-> Certainly due to my response from Postman

{
    "cause": {
        "cause": null,
        "message": "Cannot invoke \"com.laramendez.appweb.repository.ProgrammeRepository.existsByNom(String)\" because \"this.programmeRepository\" is null"
    },
    "message": "HV000028: Unexpected exception during isValid call."
}

dependencies in pom.xml

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://stackoverflow.com/a/71416675/19092469 -->
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-hibernate5</artifactId>
        </dependency>

        <!-- Réduire code répétitif et source d'erreur (reduce boilerplate) -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <!-- Réduire code répétitif et source d'erreur (reduce boilerplate) -->



        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

nomUniqueValidator

package com.laramendez.appweb.validation.validator;

import com.laramendez.appweb.repository.ProgrammeRepository;
import com.laramendez.appweb.validation.annotation.ProgrammeNomUnique;
import jakarta.validation.ConstraintValidator;
import jakarta.validation.ConstraintValidatorContext;
import lombok.NoArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;


@NoArgsConstructor
public class NomUniqueValidator implements ConstraintValidator<ProgrammeNomUnique, String> {

    private ProgrammeRepository programmeRepository;


    @Autowired
    public NomUniqueValidator(ProgrammeRepository programmeRepository) {
        this.programmeRepository = programmeRepository;
    }


    @Override
    public void initialize(ProgrammeNomUnique constraintAnnotation) {
    }

    @Override
    public boolean isValid(String nouveauNom, ConstraintValidatorContext constraintValidatorContext) {
        
        return !programmeRepository.existsByNom(nouveauNom);

    }
}

ProgrammeNomUnique

package com.laramendez.appweb.validation.annotation;

import com.laramendez.appweb.validation.validator.NomUniqueValidator;
import jakarta.validation.Constraint;
import jakarta.validation.Payload;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Constraint(validatedBy = NomUniqueValidator.class)
@Target({ElementType.METHOD, ElementType.FIELD})
@Retention(RetentionPolicy.RUNTIME)
public @interface ProgrammeNomUnique {

        // define default error message
        String message() default "Un programme porte déjà le même nom";

        // define default groups
        public Class<?>[] groups() default {};

        // define default payloads
        public Class<? extends Payload>[] payload() default {};

}

ProgrammeRepository

package com.laramendez.appweb.repository;

import com.laramendez.appweb.entity.Programme;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
import org.springframework.web.bind.annotation.CrossOrigin;


@CrossOrigin(origins = "http://localhost:4200")
@RepositoryRestResource(path = "programmes")
public interface ProgrammeRepository extends JpaRepository<Programme, Integer> {

    boolean existsByNom(String nom);
}

I'm using Spring Data Rest, that's why i do not have controller, dao and service.

I do not have nothing interesting in my properties.

Thanks !

My injection in my custom validator return null. Do someone know why? How to dix it?

UPDATE: I just kept an empty constructor like this with advice from M. Deinum but it still does not work, i have the same error

public class NomUniqueValidator implements ConstraintValidator<ProgrammeNomUnique, String> {

    @Autowired
    private ProgrammeRepository programmeRepository;

    public NomUniqueValidator() {
    }

    @Override
    public void initialize(ProgrammeNomUnique constraintAnnotation) {
    }

    @Override
    public boolean isValid(String nouveauNom, ConstraintValidatorContext constraintValidatorContext) {

        return !programmeRepository.existsByNom(nouveauNom);

    }
}

UPDATE: with advice from daniu I tried but I still have the same issue

@Component
public class NomUniqueValidator implements ConstraintValidator<ProgrammeNomUnique, String> {
//[...]
}

@Service
public class NomUniqueValidator implements ConstraintValidator<ProgrammeNomUnique, String> {
//[...]
}

UPDATE : with M. Deinum Advice, does not work

@Component
@Scope("request")
@RequiredArgsConstructor
public class NomUniqueValidator implements ConstraintValidator<ProgrammeNomUnique, String> {

        @Autowired
        private  ProgrammeRepository programmeRepository;


    @Override
    public void initialize(ProgrammeNomUnique constraintAnnotation) {
    }

    @Override
    public boolean isValid(String nouveauNom, ConstraintValidatorContext constraintValidatorContext) {
        return !programmeRepository.existsByNom(nouveauNom);

    }

• I add @Component to my ProgrammeNomUnique.java

Question : I found a github project which works. I did exactly the same way but it was not working for me... The oly one difference, he used javax imports and i use jakarta imports. I cannot use javax because i'm using SB3, maybe they changed how it works... what do you think?

HERE there is my gitHub if you want to see and try with me -> https://github.com/RaphaelAMAMAM/temp-repo-for-validator