Configuring a Data Source
A benefit of EJB is that the container manages database connection pooling for you. It also enlists the resource manager to manage transactions automatically. You’ll learn more about resource managers and transaction enlistment in Chapter 12, “Transactions,” so don’t worry about what that part means yet if it’s unfamiliar to you. In short, a resource manager provides access to a data store of some type. In this chapter, a relational database management system is the resource manager of the most interest.
Most of the JDBC coding you do in a bean class that uses BMP is no different than what you’d do in a non-EJB application. The only significant difference is in how you configure a data source and obtain a connection ...
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