lazy로 설정했기 때문에 처음엔 로딩 되지 않은 상태

@Test
public void fetchJoinNo() {
	em.flush();
	em.clear();

	Member findMember = queryFactory
			.selectFrom(member)
			.where(member.username.eq("member1"))
			.fetchOne();

	boolean loaded = emf.getPersistenceUnitUtil().isLoaded(findMember.getTeam());
	assertThat(loaded).isFalse();
}

• 팀은 안 가져 왔다.

@Test
public void fetchJoinUse() {
	em.flush();
	em.clear();

	Member findMember = queryFactory
			.selectFrom(member)
			.join(member.team, team).fetchJoin()
			.where(member.username.eq("member1"))
			.fetchOne();

	boolean loaded = emf.getPersistenceUnitUtil().isLoaded(findMember.getTeam());
	assertThat(loaded).isTrue();
}

• 조인 뒤에 fetchJoin() 을 붙여 주면 된다.