Avoid the UnmodifiableCollection at the list

[Otávio Santana]

@Entity("vendors")
public class Vendor implements Serializable {
       @Id
        private  String name;

        @Column
        private Set<String> prefixes;

        Vendor() {}

        public Vendor(String name) {
                this.name = name;
                prefixes = Collections.emptySet();
        }
}

[Adam Waldenberg]

The above pull request fixes this issue - so this can now be closed!

[Otávio Santana]

Nice. Thank you for the feedback and help.