public interface CustomRepository<T,ID extends Serializable> extends JpaSpecificationExecutor<T>
{	
	 Page<T> findAll(EntityManager entityManager,Specification<T> spec, Pageable pageRequest, EntityGraph.EntityGraphType entityGraphType, String entityGraphName);
}

@NoRepositoryBean
public class FolderCustomRepositoryImpl implements CustomRepository<Folder,Long>
{

	private final JpaEntityInformation<Folder, ?> entityInformationCust;
	private Class<Fascicolo> domainClassCust;


         public FolderCustomRepositoryImpl(EntityManager entityManager) {
		this.domainClassCust=Folder.class;
		this.entityInformationCust = JpaEntityInformationSupport.getEntityInformation(domainClassCust, entityManager);
	}

        @Override
	public Page<Fascicolo> findAll(EntityManager entityManager,Specification<Folder> spec, Pageable pageable, EntityGraphType entityGraphType,
			String entityGraphName) {

		CriteriaBuilder builder = entityManager.getCriteriaBuilder();
		CriteriaQuery<Folder> query = builder.createQuery(domainClass);
		Root<Folder> root = query.from(domainClass);
		CriteriaBuilder builder = entityManager.getCriteriaBuilder();
		Predicate predicate = spec.toPredicate(root, query, builder);
       		query.where(predicate);
		query.select(root);
 		query.orderBy(toOrders(sort, root, builder));
 		query.setHint(entityGraphType.getKey(), entityManager.getEntityGraph(entityGraphName));
		query.setFirstResult(pageable.getOffset());
		query.setMaxResults(pageable.getPageSize());
		List<Folder> content = query.getResultList();

		return new PageImpl<>(content, pageable, total);

	}
}