java: variable em might not have been initialized 오류

@SpringBootTest
@Transactional
public class QuerydslTest {

    @Autowired
    MemberRepository memberRepository;

    @Test
    public void dynamic_BooleanBuilder() {
        String username = null;
        int age = 10;
        List<Member> members = memberRepository.searchMemberAll(username, age);
        for (Member member : members) {
            System.out.println("member = " + member);
        }
    }
}

MemberRepository를 만들어서

동적쿼리를 테스트하려고 했는데

C:\study\querydsl\querydsl\src\main\java\study\querydsl\repository\MemberRepository.java:21:56

java: variable em might not have been initialized오류가 떴습니다.

@Repository
@RequiredArgsConstructor
public class MemberRepository {

    private final EntityManager em;

    JPAQueryFactory queryFactory = new JPAQueryFactory(em);

    public List<Member> searchMemberAll(String username, Integer age) {

        BooleanBuilder booleanBuilder = new BooleanBuilder();
        if (username != null) {
            booleanBuilder.and(member.username.eq(username));
        }

        if (age != null) {
            booleanBuilder.and(member.age.eq(age));
        }
        return queryFactory.selectFrom(member).where(booleanBuilder).fetch();
    }
}

어디가 문제일까요 ? 

@RequiredArgsConstructor로 

em을 초기화했다고 생각하는데.. ;;