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An important point to consider is the fact that even if you specify nothing for transaction management in your EJB, the container still assumes default transactional behavior. However, the container applies no default security settings if you leave it out. The assumption is that at a minimum, an application server would be authenticated and authorized at a level higher than EJB (for example, the web tier). Nevertheless, we definitely recommend that you not leave yourself vulnerable by ignoring security at the mission-critical EJB layer where most of your code and data is likely to reside. Security vulnerabilities are insidious and you are better safe than sorry. Most importantly, the security features of EJB 3 are so easy to use that there is no reason to risk the worst by ignoring them. The discussion on security and transactions wraps up our coverage of session and message-driven beans. Neither feature is directly applied to the EJB Persistence API as they were for entity beans in EJB 2. You ll see why this is the case as we explore the persistence API in the next few chapters.
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Part 3 Diving into the Java Persistence API (JPA)
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he goal of this part is to provide deep and broad coverage of JPA in a digestible manner. After reading this part of the book, you will have all the knowledge necessary to start developing robust business applications using JPA. 7, Implementing domain models, covers domain modeling, a central concept in ORM. The chapter describes how a conceptual business application domain model is translated to JPA entities, embedded objects, and entity relationships. 8, Object-relational mapping, takes on the most complicated aspects of ORM: mapping entities, embedded objects, and entity relationships to databases. The chapter covers the annotations you can use for mapping objects to tables and fields to table columns. It also explores mapping various data types, primary keys, relationships, and OO inheritance to databases. 9, Manipulating entities with EntityManager, describes the JPA EntityManager, a central interface that defines persistence operations. You ll learn how the EntityManager interface is used to create, update, delete, and retrieve entities persisted in the database. The chapter also deals with the entity lifecycle as it relates to ORM persistence operations. 10, Using the query API and JPQL to retrieve entities, covers object-relational queries. The chapter explores the use of the JPA query interface in detail. In addition, the chapter outlines how the Java Persistence Query Language ( JPQL) is used to retrieve entities from the database in an extremely flexible and robust manner.
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This chapter covers
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Domain modeling concepts Entities and entity identity Relationships between entities
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Most of today s enterprise systems save their data into a relational database of some kind. This is why persistence the process of saving and retrieving data from permanent storage has been a major application development concern for many decades. As a matter of fact, some authoritative sources claim that a great majority of enterprise development efforts concentrate on the problem of persistence. Arguably, after JDBC, EJB 2 entity beans have been the most significant groundbreaking solution to the problem of persistence in Java. Unfortunately, many of us who developed entity beans experienced an API that felt overcomplicated, cumbersome, and unpolished. It is pretty fair to say entity beans were the most weakly conceived part of EJB 2. In the past few years, lightweight persistence solutions like Hibernate and TopLink successfully filled the gap left open by entity beans. The EJB 3 Java Persistence API (JPA) brings the innovative ideas created by these popular solutions into the Java EE standard and leaves behind the entity beans paradigm. Domain modeling is a concept inseparably linked with persistence. In fact, it is often the domain model that is persisted. As a result, it makes good sense to present JPA by breaking things down into four chapters that might mirror the iterative process of developing the domain model and persistence layer of the ActionBazaar application. We have decided on four convenient development phases: defining, persisting, manipulating, and querying the domain model. In this chapter, we briefly introduce domain modeling, present the ActionBazaar domain model, and implement part of the domain model using the EJB 3 JPA. In chapter 8 we explain how entities in our domain model are persisted into a database by using object-relational mapping. In chapter 9, we manipulate the entities using the EntityManager API. Finally, in chapter 10, we query the persisted entities using the EJB 3 query API.
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