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.

Answer 1

Just use:

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

depending on your needs. Check Which Java Type do you use for JPA collections and why?

In the mapping file:

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

If you use annotations, just use the equivalent one:

@ElementCollection
List<MediaRole.MediaRoleEnum> mediaRoles;