You need to create a message-based service. Look at the Axis examples (JBoss.NET is based on Axis) on message based services for some idea of how to go about this.
You might also view section 1.2 onwards of this document to see what is going on:
This should give you a start and then you just need to fit this in with the JBoss.NET framework and it's deployment process.
Hope it helps.