you can't just call a bean from the other.
you have to step through the usual procedure, looking it up (or use the servicelocator
pattern to receive a reference to the bean) via JNDI.
to do so you need to add a bean reference to the deployment descriptors.
i don't know for sure, but in the
j2ee tutorial
you should find more infos about it:
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/J2eeTutorialTOC.html