Save order of set in hibernate

Question

I have two collections, which by default are set to PersistentSet by hibernate. The issue is that under the hood hibernate casts them to HashSet, but I want them to be set to LinkedHashSet, as I want to preserve the order in which the elements are added.

@ElementCollection(fetch = FetchType.LAZY)
private Set<String> responsibilities;

@ElementCollection(fetch = FetchType.LAZY)
private Set<String> requirements;

I have tried a couple of things, but without success

public void setResponsibilities(LinkedHashSet<String> responsibilities) {
    this.responsibilities = responsibilities;
}

public void setRequirements(LinkedHashSet<String> requirements) {
    this.requirements = requirements;
}

The other thing I tried was:

@ElementCollection(fetch = FetchType.LAZY)
private Set<String> requirements = new LinkedHashSet<>();

What hibernate version do you use? – SternK Feb 21 '20 at 13:50 — SternK, Feb 21 '20 at 13:50
hibernate 5 spring boot 2+ – Alexander Mladzhov Feb 21 '20 at 15:27 — Alexander Mladzhov, Feb 21 '20 at 15:27

score 0 · Answer 1 · answered Feb 21 '20 at 13:56

0

Please have a look here https://docs.jboss.org/hibernate/orm/4.1/manual/en-US/html_single/#collections-sorted Seems that this can be done using SortedSet or just try using below solution:

@OrderBy("created DESC")
private Set<MyEntity> entities;

answered Feb 21 '20 at 13:56

Michal Cholewiński

454
2
14

I have tried your solution and it didn't do the job, also please note that my set is of String, not of a custom object – Alexander Mladzhov Feb 21 '20 at 15:31

Save order of set in hibernate

1 Answers1