For this one you need mail.jar from lib/ext
Have you changed the value of jboss.bundle?
Is it the correct value?
I didn't find anything about a jboss.bundle setting in the documentation. Where can I set it? (is it for the pestore to find all jboss jar files?)
In my version it is page 382, the third step.
It should contain the location where you installed jboss.
NOTE: I haven't tried the petstore demo myself.