EhCache3 and Spring boot not keeping value on memory

I'm using springboot and echCache3 in order to keep in memory some parameters. I have configured in this way :

echcache.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.ehcache.org/v3"
    xmlns:jsr107="http://www.ehcache.org/v3/jsr107"
    xsi:schemaLocation="
            http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd
            http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd">

    <cache alias="paramCache">
       

        <listeners>
            <listener>
                <class>com.telefonica.npro.cacheconf.CacheEventLogger</class>
                <event-firing-mode>ASYNCHRONOUS</event-firing-mode>
                <event-ordering-mode>UNORDERED</event-ordering-mode>
                <events-to-fire-on>CREATED</events-to-fire-on>
                <events-to-fire-on>EXPIRED</events-to-fire-on>
            </listener>
        </listeners>

      <resources>
      <heap unit="entries">2000</heap> 
      <offheap unit="MB">100</offheap> 
    </resources>
    </cache>

</config>

CacheConfig

@Configuration
@EnableCaching
public class CacheConfig {
 
}

CacheEventLogger

public class CacheEventLogger implements CacheEventListener<Object, Object> {

    private static final Logger log = LogManager.getLogger(CacheEventLogger.class);

    @Override
    public void onEvent(CacheEvent<Object, Object> cacheEvent) {
        log.info("Cache event {} for item with key {}. Old value = {}, New value = {}", cacheEvent.getType(), cacheEvent.getKey(), cacheEvent.getOldValue(), cacheEvent.getNewValue());
    }


}

And I'm using it on CustomRepositoryImpl

    public class CustomRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID>
        implements CustomRepository<T, ID> {

....

    @Override
    @Transactional
    @Cacheable(value = "paramCache")
    public String getParam(String nombreParametro) {
        String valor = (String) entityManager
                .createNativeQuery(
                        "Select valor from npro_configuracion where parametro='" + nombreParametro + "' and activo='S'")
                .getSingleResult();
        return valor;
    }
..
}

But I dont see any trace of the CacheEventLogger, and everytime I ask for the value is doing the query... What is wrong?

EDIT (adding more info)

This is the class where I'm calling the getParam method. It's @Service class..

@Service("uorganizativaService")
@Transactional
public class UOrganizativaServiceImpl implements UOrganizativaService {
...
    @Override
public List<UnidadOrganizativaDTO> getUOrganizativaFiltered(String id_centro_coste, String nombre_centro_coste,
        String id_orden_interna) {

    TSpecification<UnidadOrganizativa> uorganizativadSpecification = new TSpecification<UnidadOrganizativa>();

    if (nombre_centro_coste != null && !nombre_centro_coste.isEmpty() && !nombre_centro_coste.equals("null")) {
        logger.debug("Filtramos por el campo nombre_centro_coste = " + nombre_centro_coste);
        uorganizativadSpecification
                .add(new SearchCriteria("nombre_centro_coste", nombre_centro_coste, SearchOperation.MATCH_END));
    }
    if (id_centro_coste != null && !id_centro_coste.isEmpty() && !id_centro_coste.equals("null")) {
        logger.debug("Filtramos por el campo id_centro_coste = " + id_centro_coste);
        uorganizativadSpecification
                .add(new SearchCriteria("id_centro_coste", id_centro_coste, SearchOperation.MATCH_END));
    }
    if (id_orden_interna != null && !id_orden_interna.isEmpty() && !id_orden_interna.equals("null")) {
        logger.debug("Filtramos por el campo id_orden_interna = " + id_orden_interna);
        uorganizativadSpecification
                .add(new SearchCriteria("id_orden_interna", id_orden_interna, SearchOperation.MATCH_END));
    }
    uorganizativadSpecification.add(new SearchCriteria("activo", "S", SearchOperation.EQUAL));

    Pageable topfifty = new PageRequest(0, 50);
    Page<UnidadOrganizativa> listaUorganizativa = uorganizativaRepository.findAll(uorganizativadSpecification,
            topfifty);

    String totalRegistrosMostrar =  uorganizativaRepository.getParam("MAX_REGISTROS_A_MOSTRAR");
    //Total de elementos
    long totalRegistrosBD = listaUorganizativa.getTotalElements();
    List<UnidadOrganizativa> lista = listaUorganizativa.getContent();
    // Indicador para advertir si mostramos todos los registros o no
    boolean registrosLimitados = totalRegistrosBD > Integer.valueOf(totalRegistrosMostrar) ? true : false;
    List<UnidadOrganizativaDTO> listaUOrganizativaDTO = lista.stream().map(e -> new UnidadOrganizativaDTO(e,registrosLimitados))
            .collect(Collectors.toList());
    


    return listaUOrganizativaDTO;
}

Regards

I solved already changin the @Cacheable annotation from the Impl to the Interface.

    @NoRepositoryBean
public interface CustomRepository<T, ID extends Serializable> extends JpaRepository<T, ID> {
 ....

    @Cacheable(value = "paramCache")
    String getParam(String nombreParametro);
}