@XmlRootElement
public class PersistentReservationData { 
   
    private ArrayList<Integer> customerIds;       
    private ArrayList<GregorianCalendar> startingIntervals;    
    private ArrayList<GregorianCalendar> endingIntervals;
    private ArrayList<Integer> numberOfSeats;
    
    @XmlElement
    public ArrayList<Integer> getCustomerIds() {
        return customerIds;
    }

    @XmlElement
    public ArrayList<GregorianCalendar> getStartingIntervals() {
        return startingIntervals;
    }

    @XmlElement
    public ArrayList<GregorianCalendar> getEndingIntervals() {
        return endingIntervals;
    }

    @XmlElement
    public ArrayList<Integer> getNumberOfSeats() {
        return numberOfSeats;
    }
}