What is JDev and BC4J?
Datasources in jboss are always bound in the java: context, so you need to look them up like java:/DefaultDS. You can also make local names for them for each ejb like java:/comp/env/MyLocalNameForMyDS, and map these local names to global names (such as java:/DefaultDS) in jboss.xml.
I'd guess you need to find where "jdbc/toystoreDS" is being specified and try to change it to one of the forms I mentioned.
JDev = ORACLE JDeveloper 220.127.116.11
BC4J = ORACLE framwork for building J2EE applications using database (quite powerfull, free, easy, working with struts !).
I'm lerning that all stuff , and there is a lot of questions in my head ...