인프런 커뮤니티 질문&답변

package hellojpa;

import jakarta.persistence.*;

import java.util.List;

public class  JpaMain {

    public static void main(String[] args) {

        EntityManagerFactory emf = Persistence.createEntityManagerFactory("hello");
        EntityManager em = emf.createEntityManager();
        //code

        EntityTransaction tx = em.getTransaction();
        tx.begin();

        try {
            Member member = new Member();
            member.setUsername("member1");
            member.setHomeAddress(new Address("homeCity", "street", "1000"));

            member.getFavoritesFoods().add("치킨");
            member.getFavoritesFoods().add("족발");
            member.getFavoritesFoods().add("피자");

            member.getAddressHistory().add(new Address("old1", "street1", "10001"));
            member.getAddressHistory().add(new Address("old2", "street2", "10002"));

            em.persist(member);

            em.flush();
            em.clear();

            System.out.println("=============");
            Member findMember = em.find(Member.class, member.getId());

            Address a = findMember.getHomeAddress();
            findMember.setHomeAddress(new Address("city", a.getStreet(), a.getZipcode()));

            findMember.getFavoritesFoods().remove("치킨");
            findMember.getFavoritesFoods().add("한식");

            tx.commit();
        } catch (Exception e) {
            tx.rollback();
        } finally {
            em.close();
        }

        emf.close();
    }

    private static Member saveMember(EntityManager em) {
        Member member = new Member();
        member.setUsername("member1");
        em.persist(member);
        return member;
    }
}

이 때 
member.getAddressHistory().add(new Address("old1", "street1", "10001"));
위 코드는 update문이 나갑니다. 그 이유는 알고 있는데

findMember.getFavoritesFoods().add("한식");
이 코드는 update가 아니라 insert문이 나가더라고요. 왜 update가 아니라 insert문이 나가는 건가요?