JAVA calling an RPG program

Hello.  I work in an iSeries shop on an legacy RPG application and we
are in the process of rolling out a newer technology which encompasses
J2EE running in WebSphere.  As our clients have invested over 20 years
of their own business rules into our application, to make this a
seamless implementation (this will take years as it is a phased approach
due to the size and critical nature of our software within the
derivatives market) I am exploring if and how JAVA can call a RPG module
to take existing legacy code and wrap a newer UI in front of some of the
logic.  Performance obviously is an issue as is maintenance. Would there
be the need for two versions of the same module?  What about overhead?
 
Any help and suggestions on where to research would be greatly
appreciated
 
Thanks   
 
 
Al Smith * Vice President - System Architecture * SunGard * GMI * One
South Wacker Drive, Suite 400, Chicago, IL 60606
Tel +1-312-577-6222 * Mobile +1-312-404-2260 * Fax +1-312-577-6101 *
www.sungard.com/gmi <http://www.sungard.com/gmi> 
 

CONFIDENTIALITY:  This email (including any attachments) may contain
confidential, proprietary and privileged information, and unauthorized
disclosure or use is prohibited.  If you received this email in error,
please notify the sender and delete this email from your system.  Thank
you