public class BaseEvent extends Event {

    private final EventType eventType;
    private EventEntity eventEntity;

    public BaseEvent(EventType eventType) {
        this.eventType = eventType;
    }

    public synchronized EventEntity getEventEntity() throws DAOException {
        return eventEntity == null
                ? eventEntity = EventDAOFactory.getInstance()
                        .getByType(this.eventType)
                : eventEntity;
    }

}

public class BaseEvent extends Event {

    private final EventEntity eventEntity;

    public BaseEvent(EventType eventType) throws DAOException {
        this.eventEntity = EventDAOFactory.getInstance().getByType(eventType);
    }

    public EventEntity getEventEntity() {
        return eventEntity;
    }

}