public NoticeRepositoryImpl extends BaseRepositorySupport implements NoticeCustomRepository {
    // ...
    public Page<NoticeListDetail> findListDetails(Predicate predicate, Pageable pageable) {
        QNotice notice = QNotice.notice;
        QPartner partner = QPartner.partner;

        JPQLQuery<NoticeListDetail> innerQuery = from(notice)
                .innerJoin(notice.partner, partner)
                .fetchJoin()    // EAGER 로딩
                .where(predicate)
                .select(new QNoticeListDetail(notice, partner));
        return queryToPage(innerQuery, pageable);
    }

/**
 * 공통 저장소 서포트
 * 상속을 통해서 공통코드를 관리
 *
 * @author myeongju.jung
 */
public abstract class BaseRepositorySupport extends QueryDslRepositorySupport {
    public BaseRepositorySupport(Class<?> domainClass) {
        super(domainClass);
    }
    /**
     * 일반 JPQLQuery를 Page로 변환
     *
     * @param query    내부 JPQLQuery
     * @param pageable 페이징 인자
     * @param <T>      반환 타입
     * @return 페이징 결과
     */
    protected final <T> Page<T> queryToPage(JPQLQuery<T> query, Pageable pageable) {
        long count = query.fetchCount();

        List<T> content = Collections.emptyList();
        if (count > 0) {
            content = getQuerydsl().applyPagination(pageable, query).fetch();
        }
        return new PageImpl<>(content, pageable, count);
    }
}

public interface AdRepository extends JpaRepository<Ad, Long>, QueryDslPredicateExecutor<Ad> {
    @EntityGraph("Ad.withCompany")
    Page<Ad> findAll(Predicate predicate, Pageable pageable);
}

@Entity
@NamedEntityGraph(name = "Ad.withCompany", attributeNodes = @NamedAttributeNode("company"))
// ...
public class Ad {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "AD_SEQ")
    @Column(name = "AD_NO")
    private Long adNo;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "COMPANY_NO", nullable = false, updatable = false,
            foreignKey = @ForeignKey(name = "FK_AD_COMPANY_NO"))
    private Company company;
    // ...
}

public interface AdRepository extends JpaRepository<Ad, Long>, QueryDslPredicateExecutor<Ad> {
    @EntityGraph("Ad.withCompanyAndPartner")
    Page<Ad> findAll(Predicate predicate, Pageable pageable);
}

@Entity
@NamedEntityGraph(name = "Ad.withCompanyAndPartner",
        attributeNodes = @NamedAttributeNode(value = "company", subgraph = "companyWithPartner"),
        subgraphs = @NamedSubgraph(name = "companyWithPartner", attributeNodes = @NamedAttributeNode("partner")))
// ...
public class Ad {
    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "AD_SEQ")
    @Column(name = "AD_NO")
    private Long adNo;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "COMPANY_NO", nullable = false, updatable = false,
            foreignKey = @ForeignKey(name = "FK_AD_COMPANY_NO"))
    private Company company;
    // ...
}