Which version of IRAD/WSAD are you using?
Before you deploy, you must generate deployment code for the distributed EJBs to work properly. That's a right-click from within the WSAD/IRAD tool.
Potentially, this will fail if a method defined in your remote interface or home interface is not defined correctly in your
EJB Bean class. Make sure everything matches up, and generate the bean code again.
Here's a tutorial on creating and
testing EJBs within IRAD 6, and it includes the step for generated deploy code (without an exception, might I add).
Creating, Testing and Deploying EJBs in WSAD / IRAD 6 I hope this points you in the right direction.
Happy WebSphere!
-Cameron McKenzie