Section 22.4. What You Still Don t Know

22.4. What You Still Don't Know

We still haven't shown you how to deploy the EJB, now that you have one compiled. In the next chapter we'll show you how to assemble the pieces of the EJB into an Enterprise Archive and then deploy and run it.

More importantly, though, we haven't covered how to write the code for stateful session beans or entity beans. Stateful session beans are one-to-a-client-session, rather than taking all comers, so there is a little more to code, and a few small changes required in the ejb-jar.xml config file. (What is the ejb-jar.xml config file? It is part of the configuration information used to deploy your EJB, the topic of the next chapter.) But there are some serious complications with entity beans that involve retrieving the bean's data from a "backing store"for example, a databaseand writing it back. There are many good references on these topics, and we mention our favorites in the next section.