Jpa repository with list of enum

Question

So I want to implement a Jpa Repository of my class Reservation.

My RoomType Enum:

public enum RoomType{
    BREUGHELZAAL("Breughel zaal"),
    CARDIJNZAAL("Cardijn zaal"),
    FEESTZAAL("Feest zaal"),
    KEUKEN("Keuken"),
    RECEPTIEZAAL("Receptie zaal"),
    KLEINEKEUKEN("Kleine keuken");

    private String roomType;

    RoomType(String roomType){
       this.roomType= roomType;
    }

    public String getRoomType(){
        return roomType;
    }
}

Now I have no clue how to implement this. I need a List of Enum types in my reservation class, i guess it is something like this, but I don't know the annotation for the enum type:

@OneToMany(cascade = CascadeType.ALL)
List<RoomType> chosenRooms

Thanks in advance for the help!!

Wouldn't the RoomType be a candidate for making it an entity instead of an enum, anyway? — Jan B.
– Jan B., Commented May 23, 2018 at 11:32
The roomtypes don't change. There are 6 room types and they never change. So I don't know if making this an entity, is the right solution — dries vanbilloen
– dries vanbilloen, Commented May 23, 2018 at 11:36
Never say never :D. Of course, you know your context best, but an entity is more flexible and probably future-proof. Even when the types don't change, maybe you'd like to store the size or the capacity of a zaal, too. Just brainstorming... — Jan B.
– Jan B., Commented May 23, 2018 at 13:04
You're right, I could do it like an entity. I'm considering to store the RoomType as a list of entities... I'm not confident that all these annotations do the optimal job :-) — dries vanbilloen
– dries vanbilloen, Commented May 23, 2018 at 13:07

Eugen · Accepted Answer · 2018-05-23 12:17:25Z

7

You don't have sufficient config for Enum persistence, try :

@ElementCollection(fetch = FetchType.EAGER)
@CollectionTable(name = "RoomType", joinColumns = @JoinColumn(name = "id"))
@Enumerated(EnumType.STRING)
List<RoomType> chosenRooms

@ElementCollection - Defines a collection of instances of a basic type or embeddable class. @CollectionTable - pecifies the table that is used for the mapping of collections of basic or embeddable types (name - name of the collection table, joinColumn - The foreign key columns of the collection table).
Enumerated - Specifies that a persistent property or field should be persisted as a enumerated type.

edited May 23, 2018 at 12:17

answered May 23, 2018 at 11:32

Eugen

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1 Comment

dries vanbilloen Over a year ago

Can you explain what these annotation configure? I would like to know for in the future. I works, but I would like to know why :)

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