Well, just glancing at the code you have no assurance that
cj != null. See below.
On Wed, Jan 28, 2009 at 4:58 AM, ninaS <nina...@gmx.de> wrote:
>
> Hello,
>
> I am using a custom SortComparator implementation where I need to override
> a
> method in order to handle Null values:
>
> @Override
> public ScoreDocComparator newComparator (final IndexReader reader,
> final
> String fieldname)
> throws IOException {
> final String field = fieldname.intern();
> final Comparable[] cachedValues
> = FieldCache.DEFAULT.getCustom (reader, field,
> CollatorBasedComparator.this);
>
> return new ScoreDocComparator() {
>
> public int compare (ScoreDoc i, ScoreDoc j) {
> Comparable ci= cachedValues[i.doc];
> Comparable cj= cachedValues[j.doc];
>
> int returnValue =0;
> if (ci == null)
> returnValue = (cj==null) ? 0 : 1;
> else
> if (cj == null) returnValue = -1;
> //
> else
*****what guarantee do you have here that cj != null? You test for ci
being null, but not for cj.
>
> returnValue= ci.compareTo(cj);
>
> return returnValue;
> }
>
> public Comparable sortValue (ScoreDoc i) {
> return cachedValues[i.doc];
> }
>
> public int sortType(){
> return org.apache.lucene.search.SortField.CUSTOM;
> }
> };
> }
>
>
> Is there anything wrong about the code? Because I get the exception:
>
> java.lang.NullPointerException
> at
>
> org.apache.lucene.search.FieldDocSortedHitQueue.lessThan(FieldDocSortedHitQueue.java:164)
> at
> org.apache.lucene.util.PriorityQueue.upHeap(PriorityQueue.java:139)
> at org.apache.lucene.util.PriorityQueue.put(PriorityQueue.java:53)
> at
>
> org.apache.lucene.util.PriorityQueue.insertWithOverflow(PriorityQueue.java:78)
> at
> org.apache.lucene.util.PriorityQueue.insert(PriorityQueue.java:63)
> at
> org.apache.lucene.search.MultiSearcher.search(MultiSearcher.java:241)
> at org.apache.lucene.search.Hits.getMoreDocs(Hits.java:100)
> at org.apache.lucene.search.Hits.hitDoc(Hits.java:206)
> at org.apache.lucene.search.Hits.doc(Hits.java:155)
>
> I am using lucene 2.3.1.
>
> Please help me.
>
> Thank you in advance,
>
> Nina
>
> --
> View this message in context:
> http://www.nabble.com/NullPointerException-in-FieldDocSortedHitQueue.lessThan-with-custom-SortComparator-tp21702845p21702845.html
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org
> For additional commands, e-mail: java-user-h...@lucene.apache.org
>
>
