How to upload a java application into the oracle DB

Hello,
I am in search of an issue that is worrying me now for weeks. I have a java application which is independent. Now I want to upload this application to the oracle DB.The idea is for the application to sit on the DB and do it work from there, which is to transfer data to another 3rd party independent system. What is the best way of doing this? Is there any utility which can help me to upload a java application to the DB?
Also after uploading the application in the DB, how can it be called? Is there any tutorial to guide me please?
Thank you all for brain storming

Check the docs for "Java Stored Procedure":
http://www.oracle.com/pls/db92/print_hit_summary?search_string=java+stored+procedure

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