Foreign key is always null in one to many relation - Spring Boot Data with JPA

Question

I have two entity classes Country and Language having bi-directional one to many relationship.

Below are the entity classes:

Answer 1

Update the setter for languages in Country class to the below :

 public void setLanguages(List languages) {
        this.languages = languages;
        languages.forEach(entity -> entity.setCountry(this));
    }