Chapter 9. Transactions and Security

Transaction and security management are important matters for enterprises. They allow applications to have consistent data and secure the access to it. Both services are low-level concerns that a business developer shouldn't have to code himself. EJBs provide these services in a very simple way: either programmatically with a high level of abstraction or declaratively using metadata.

Most of an enterprise application's work is about managing data: storing it (typically in a database), retrieving it, processing it, and so on. Often this is done simultaneously by several applications attempting to access the same data. A database has low-level mechanisms to preserve concurrent access, such as pessimistic locking, ...

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