JPA and a set of enum values

Question

Is there a simple way to store a set/list of Enum items using JPA (with Hibernate)? There could be no duplicates in the list. I currently try:

public EnumSet<MediaRole.MediaRoleEnum> mediaRoles;

But this returns a null pointer when accessing the field.

score 2 · Accepted Answer · edited May 23 '17 at 10:29

2

Just use:

List<MediaRole.MediaRoleEnum> mediaRoles;
Set<MediaRole.MediaRoleEnum> mediaRoles;

In the mapping file:

<attributes>
    <element-collection name="mediaRoles"/>
</attributes>

If you use annotations, just use the equivalent one:

@ElementCollection
List<MediaRole.MediaRoleEnum> mediaRoles;

edited May 23 '17 at 10:29

Community

answered Jun 01 '12 at 18:33

Butaca

I don't want duplicates, and using the list will allow this. Is there an easy way to prevent this from happening if using the above, as using getters and setters for the list as a while is not going to help. – Luuk D. Jansen Jun 01 '12 at 18:49
Also, you should update your question regarding the non duplicates. – Butaca Jun 01 '12 at 19:10

1 Answers1