How can I implement this request

[jsn]

Hi all

here is what I need
- from a stand alone application in this case an Oracle jdeveloper form,
- click on a button
- open a web application in RoR,
- let the user choose several options in the RoR page and calculate a
Total Amount,
- return the total amount to the jdeveloper application

How can I implement this request?

Could it be done with web services?

-the Oracle jdeveloper form calls a web service that opens my RoR web
application,
- then my RoR web application returns a Total Amount value,
- my web service returns the Total Amount
- the jdeveloper form gets the Total Amount from the web service


Which are the other options available to make an jdeveloper form
communicate with a RoR application?

Regards