Novice... I am using Tomcat 5.5. I tried servlet-examples. I tried to develop my first servlet and also developed html file to POST data on servlet. I renamed index.html which was there by default and put my index.html. Later,I thought that I shouldnt have done it, I renamed my index.html and put original index.html again. I restarted the server. But when tried to access any html file, it displays null on the page. Just "null" nothing else. Moreover, I tried directly accessing servlet with URL and ?param=value, it worked well. I did not understand, why it is displaying null in case of html.