Code example for HashSet

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import play.db.jpa.Model; 
 
@Entity 
public class CompositeIdForeignA extends Model { 
	@OneToMany(mappedBy = "compositeIdForeignA", fetch = FetchType.LAZY) 
	public Set<CompositeIdEntity> a2Bs = new HashSet<CompositeIdEntity>(); 
	 
	public String testId; 
}