Indexing the ORACLE using lucene

Hi all, I am new to Lucene. I am developing a small search utility using lucene. I have to create the index from my Oracle database. Can anybody tell me how to create the index from Oracle using lucene? Please send me code snippets if possible. Your valuable help is highly appreciated.

How to Update the Index once it is created

Hi All, Thanks for your response. I have one more doubt. How can I update a index once created from Oracle, instead of recreating the whole. Whenever there is a change in the oracle table (insertion/updation/deletion of a row) my application should update the index. Thanks in advance.