This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I haven't tried this type of communication between action classes. If this were my application, I'd extract the logic from Action B and turn it into a web service. I'd then access the web service from Action A.