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Hello World examples have ruled the world since they first appeared in The C Programming Language by Brian Kernighan and Dennis Ritchie (Prentice Hall PTR, 1988). Hello World caught on and held ground for good reason. It is very well suited to introducing a technology as simply and plainly as possible. While almost every technology book starts with a Hello World example, to keep things lively and relevant we plan to deviate from that rule and provide a slightly different example. In 2004, one of the authors, Debu, wrote an article for the TheServerSide.com in which he stated that when EJB 3 was released, it would be so simple you could write a Hello World in it using only a few lines of code. Any experienced EJB 2 developer knows that this couldn t be accomplished easily in EJB 2. You had to write a home interface, a component interface, a bean class, and a deployment descriptor. Well, now that EJB 3 has been finalized, let s see if Debu was right in his prediction (listing 1.1).

When we identify a column or set of columns as the primary key, we essentially ask the database to enforce uniqueness. Primary keys that consist of business data are called natural keys. The classic example of this is SSN as the primary key for an EMPLOYEE table. CATEGORY_ID or EMPLOYEE_ID, on the other hand, are examples of

private PasswordHome getPasswordHome() {

surrogate keys. Essentially, surrogate keys are columns created explicitly to function as primary keys. Surrogate keys are popular and we highly recommend them, especially over compound keys. There are three popular ways of generating primary key values: identities, sequences, and tables. Fortunately, all three strategies are supported via the @GeneratedValue annotation and switching is as easy as changing the configuration. Let s start our analysis with the simplest case: using identities. Identity columns as generators Many databases such as Microsoft SQL Server support the identity column. You can use an identity constraint to manage the primary key for the User entity as follows:

code structuring and greater manageability of large programs. Think of AOP, which aims to continue this tradition, as the latest addition to this family of paradigms. For example, the concept of the procedure, which languages such as Pascal embody, allows you to partition a program into entities called procedures. As you know, each procedure is simpler to write and understand than the program as a whole is. You therefore build a program as a set of procedures that call one another. The use of procedures aids the development of large applications because individuals on a team can independently develop procedures. Individuals can also test procedures independently, allowing programming errors to be more easily located. Although the transition was not instantaneous, procedural programming contributed to the disappearance of the goto instruction. This instruction, which transferred execution to a specific line of the program, tended to cause spaghetti code. In other words, the program would quickly become tangled preventing the ability to reuse some parts of the program independently of others. Procedural programming, on the other hand, allows you to code elementary tasks that each contain clearly identified beginning and end points. This type of programming makes it possible to create libraries of procedures that can be reused by many different programs. Procedural programming simplifies the coding process. It allows programmers to develop modular hence more understandable programs by giving a clearer structure to the code. However, procedural programming does not provide a secure structure for any of the data. Indeed, one of the great weaknesses of this paradigm is that global variables can be accessed from anywhere in the program and doing so improperly can lead to unexpected side effects.

@Id @GeneratedValue(strategy=GenerationType.IDENTITY) @Column(name="USER_ID") protected Long userId;

InitialContext try { instance Context ic = new InitialContext(); PasswordHome passwordHome = ( PasswordHome ) ic.lookup("ejbAccess.passwordHome");