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javahibernatejpaormhibernate-mapping

JPA clear collection and add new items

I have a @OneToMany collection (list) that I would like to clear, and add new elements to in the same transaction.

Using 

collection.clear();
collection.add(new EntityB());

Simply adds the new instance, and never removes anything. I have orphanRemoval = true for the collection field.

ADDED:

// Parent entity
@OneToMany(mappedBy = "product", orphanRemoval = true)
private List<Feature> features = new ArrayList<>();

// Child entity
@ManyToOne(cascade = CascadeType.ALL)
private Product product;

// Clear and add attempt
product.getFeatures().clear();

Feature feature = new Feature(product, ls);
product.getFeatures().add(feature);
Solution

  • Turns out that the actual solution was using a @JoinColumn annotation instead of the mappedBy="" parameter.