Andrzej, I'm so sorry about still disturbing you! I followed your suggest and i have found this code:
try { searcher = new IndexSearcher( IndexReader.open(indexName) //create an indexSearcher for our page ); } catch (Exception e) { IndexSearcher is a class of Lucene API, isn't this? I have used as "indexName" the index created by nutch. When I access the lucene web page of my application, the system not produce any exception, but the result list is always empty (for any search keyword used). What's wrong? Thanks in advance. Giovanni Atitlan Engineering, Pisa