title: how to crawl data on few topics using apache nutch?
body: <p>I am using apache nutch to perform crawling on rosettacode. I dont want to crawl through entire website, i just want to crawl on selected topics(eg.<a href="http://www.rosettacode.org/mw/index.php?title=Special%3ASearch&amp;search=Optimization+algorithms&amp;go=Go" rel="nofollow">http://www.rosettacode.org/mw/index.php?title=Special%3ASearch&amp;search=Optimization+algorithms&amp;go=Go</a>). But i am unable to perform crawl and it is throwing me error saying "no urls to fetch.. check ur seed list and url filters". Can anyone help me to solve this problem?? </p>