NullPointerException 질문입니다! [closed]

Question

for(int i = startPosition; i<pos; i++) {
    if(i == startPosition) {
        totalDistance.add(0);
    } else {
        if(allRsList != null)
            dis1 = Integer.getInteger(allRsList.get(i-1).getFullSectDist());

        totalDistance.add(dis1 + totalDistance.get(i-startPosition-1));
    }
    stationName.add(allRsList.get(i).getStationName());
    stationId.add(allRsList.get(i).getStationId());
}

 

totlaDistance, stationName, stationId 모두 arrayList입니다.
dis1 = Integer.getInteger(allRsList.get(i-1).getFullSectDist());
여기서 자꾸 nullPointerException이 나는데 왜 나는건가요??ㅠㅠ