FastVectorHighlighter.getBestFragments returning null

[Joel Halbert]

Hi,

I'm using Lucene 3.0.3. I'm extracting snippets using
FastVectorHighlighter, for some snippets (I think always when searching
for exact matches, quoted) the fragment is null.

Code looks like:


                        query = QueryParser.escape(query);
                        if (exact) {
                                query = "\""+query+"\"";
                        }
                        BooleanQuery allQ = new BooleanQuery();
                        Query bodyQ = new QueryParser(Version.LUCENE_30, BODY, 
analyser).parse(query);
                        termQ.add(new BooleanClause(bodyQ, Occur.SHOULD));
                        // add more queries
                        allQ.add(new BooleanClause(termQ, Occur.MUST));
                        
                        TopDocs res = is.search(allQ, null, upperRange);        
                        FastVectorHighlighter highlighter = new 
FastVectorHighlighter(true, true);
                        
                        for (int i = in.getLowerRange(); i < 
Math.min(res.totalHits, upperRange); i++) {

                                String[] bodyFrags =
                                                
highlighter.getBestFragments(highlighter.getFieldQuery(bodyQ),
                                                is.getIndexReader(), 
res.scoreDocs[i].doc, BODY, 120, 2);
                
                                // bodyFrags is null
                    }


I do get a hit, and the content with the exact match is coming from the
BODY field, but I cann't seem to get the fragment out.

Any clues,

Thanks

- Joel