JPA #ManyToOne, #OneToMany bidirectional relation - jpa

Question

I'm studying bidirectional mapping.
I mapped Team and Member with #OneToOne and #ManyToMany annotations.
#Entity
public class Team {
#Id #GeneratedValue
private Long id;
private String name;
#OneToMany(mappedBy = "team")
private List<Member> members=new ArrayList<Member>();
//omit getter, setter ,toString
}
#Entity
public class Member {
#Id
#GeneratedValue
private Long id;
#Column(name="USERNAME")
private String name;
#ManyToOne
#JoinColumn(name="TEAM_ID")
private Team team;
#Enumerated(EnumType.STRING)
private Status status;
//omit getter, setter , toString
}
main method
public static void main(String args[]){
//...
Team team= new Team();
team.setName("RedTeam");
em.persist(team);
Member member= new Member();
member.setName("me");
member.setStatus(Status.ADMIN);
member.setTeam(team);
em.persist(member);
Member findmember= em.find(Member.class, member.getId());
Team findTeam= findmember.getTeam();
System.out.println("members: "+findTeam.getMembers());
//...
}
results:
members: []
I wonder why "members" were not added to the "members field" of "Team" in the code above.
Thank you in advance.

Answer 1

These are the minimal changes to make it to work
#Entity
public class Team {
#GeneratedValue(strategy = GenerationType.SEQUENCE)
private #Id Long id;
private String name;
#OneToMany(mappedBy = "team", cascade = CascadeType.ALL, orphanRemoval = true)
private List<Member> members = new ArrayList<>();
public String getName() {
return name;
}
public void setName(String pName) {
name = pName;
}
public void addMember(Member m) {
getMembers().add(m);
m.setTeam(this);
}
public void removeMember(Member m) {
getMembers().remove(m);
m.setTeam(null);
}
public List<Member> getMembers() {
return members;
}
}
Team team = new Team();
team.setName("RedTeam");
// em.persist(team);
Member member = new Member();
member.setName("" + new Random().nextInt(999999));
team.addMember(member);
em.persist(team);
Member findmember = em.find(Member.class, member.getId());
Team findTeam = findmember.getTeam();
System.out.println("Members: " + findTeam.getMembers());