I feel ashamed to tell that I am just now putting my head into learning Lucene. “Never too late”, I am trying to tell to myself.
Here is one beautiful tutorial on Lucene.
Tutorial by Steven J Owens
Please do refer to this page too
Categories: Uncategorized Tags: lucene
Krugle, most famous open-source code search engine, now powers the Yahoo Developer Network search. Not a simple step for Yahoo though, because Yahoo just a few months back scrapped its Java code and developed its pages using PHP. If you ask what Java has to do with Krugle, then this is the answer.

Krugle is built on top of Apache Lucene, 100% Java based search engine API. Is Yahoo coming back to Java?
Developers talk: You can just try your hands on Lucene with just 4 or 5 lines of code. Please search for Lucene/Nutch for more details. Mind blowing.

Here is the official announcement by Yahoo