I’m trying to store this type of data

[
    1: [
        {
           "id":"1"
        },
        {

           "id":"2"
        },
    ],
    2: [
        {
           "id":"2"
        },
        {
           "id":"3"
        },
        {
           "id":"4"
        }
    ]
]

within this class

public class TripItinerary {
    @Id
    private Long id;

    @OneToMany(cascade = CascadeType.ALL, orphanRemoval = true)
    @JoinColumn(name = "trip_itinerary_id")
    private List<List<Place>> itinerary;

where Place is an entity stored in a ‘place’ table.

Currently, I am getting a ‘One To Many’ attribute value type should not be ‘List’ error.

I’ve tried creating another entity with List<Place>, but I do not have any use case with individual List<Place> objects, so I feel like it is a waste of resources. Is there a better way to handle nested List<List<Objects>> in Spring Boot?