Runtime Error for large input

Question

public ArrayList<Interval> merge(ArrayList<Interval> intervals) {
    ArrayList<Interval> result = new ArrayList();
    if (intervals.isEmpty()) {
        return result;
    }
    Collections.sort(intervals, new Comparator<Interval>(){
        public int compare(Interval int1, Interval int2) {
            if (int1.start < int2.start) {
                return -1;
            }
            if (int1.start == int2.start && int1.end <= int2.end) {
                return -1;
            }
            return 1;
        }
    });

    int start = intervals.get(0).start;
    int end = intervals.get(0).end;
    for (int i = 1; i < intervals.size(); ++i) {
        Interval interval = intervals.get(i);
        if (interval.end < start) {
            result.add(interval);
        }
        else if (interval.start > end) {
            result.add(new Interval(start, end));
            start = interval.start;
            end = interval.end;
        }
        else {
            start = Math.min(start, interval.start);
            end = Math.max(end, interval.end);
        }
    }
    result.add(new Interval(start, end));
    return result;
}

I got Runtime Error for following test case, but I have no idea why it failed, could someone help me out? I copy/paste the code and compile&run it with same test case, no error:

[[74,78],[61,63],[46,50],[51,54],[50,50],[60,64],[39,42],[25,27],[91,95],[14,16],[85,85],[5,7],[45,46],[45,49],[66,66],[73,73],[25,26],[25,26],[45,48],[67,67],[63,65],[82,84],[90,92],[47,49],[3,4],[1,5],[64,66],[73,77],[90,94],[20,21],[84,87],[48,49],[80,80],[85,85],[53,55],[21,23],[31,34],[71,75],[62,65],[8,9],[32,33],[7,8], ...(I truncated it as it exceeds the maximum length) ,[44,45],[40,40],