Download the BlackBerry Java Development Environment, but don’t use it, except you like to torture yourself.
Download the Netbeans IDE and the Mobility Pack at netbeans.org.
Download kSOAP.
Read this: Blackberry Development Using NetBeans Mobility
Go on and write a Webservice in Domino 7. Write a J2ME Webservice client using kSOAP. Install the client on your BlackBerry device.
This setup works like a breeze.