Spring data JPA join table with extra column - spring

Question

I'm trying to implement a meeting model which contains multiple equipment entity with corresponding quantity.
In the view of meeting, user should be able to CRUD equipment and quantity of this equipment of a meeting
databases:
CREATE TABLE IF NOT EXISTS equipment (
equipment_id SERIAL PRIMARY KEY,
equipment_name VARCHAR(20) NOT NULL
);
CREATE TABLE IF NOT EXISTS meeting (
meeting_id SERIAL PRIMARY KEY,
meeting_time TIMESTAMP NOT NULL,
number_people INTEGER NOT NULL,
setup VARCHAR(255)
);
CREATE TABLE IF NOT EXISTS meeting_equipment (
meeting_equipment_id SERIAL PRIMARY KEY ,
meeting_id INTEGER NOT NULL REFERENCES meeting (meeting_id),
equipment_id INTEGER NOT NULL REFERENCES equipment (equipment_id),
quantity INTEGER NOT NULL DEFAULT 0
);
Entity implementation:
#Entity
#Table(name = "meeting")
#Data
public class Meeting {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "meeting_id", updatable = false)
#JsonIgnore
private int id;
#Column(name = "meeting_time")
#JsonFormat(pattern = "yyyy-MM-dd HH:mm")
#NotNull
private LocalDateTime meetingTime;
#Column(name = "number_people")
#NotNull
#Min(1)
private int numberPeople;
#Column(name = "setup")
#NotNull
private String setup;
#OneToMany(mappedBy = "meeting", cascade = CascadeType.ALL)
#JsonManagedReference
List<MeetingEquipment> equipmentList = new ArrayList<>();
}
#Entity
#Table(name = "equipment")
#Data
public class Equipment {
#Id
#Column(name = "equipment_id", updatable = false)
#JsonIgnore
private int id;
#NotNull
#Column(name = "equipment_name", unique = true)
#Size(min = 1, max = 100)
private String equipmentName;
}
Join table metting_equipment:
#Entity
#Table(name = "meeting_equipment", uniqueConstraints = {
#UniqueConstraint(columnNames = {"meeting_id", "equipment_id"})})
#Data
public class MeetingEquipment {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "meeting_equipment_id", updatable = false)
#JsonIgnore
private int id;
#ManyToOne
#JoinColumn(name = "meeting_id")
#NotNull
#JsonBackReference
private Meeting meeting;
#ManyToOne
#JoinColumn(name = "equipment_id")
#NotNull
private Equipment equipment;
#Column(name = "quantity")
#NotNull
private int quantity;
}
Using the code above, I can successfully create meeting with equipment included (JSON returned from creation method shows correct content). But once I try to remove an element of equipmentList in meeting entity, it does not delete meetingEquipment entity. I tried
meeting.getEquipmentList().clear() and meetingEquipmentDao.delete(meeting.getEquipmentList()), neither works.
Could anyone tell me the cause of this problem, thanks!