Sams Teach Yourself J2EE™ in 21 Days

Patterns and Idioms

You now know all the important theory behind writing Session beans, but it's always helpful to have one or two real-world insights into how to write them in practice. Patterns (or more fully, “design patterns”) are documented pearls of wisdom. Idioms are much the same thing, although they tend to be more lower-level and code-oriented.

On Day 18, many of the design patterns discussed piecemeal throughout the book will be brought together to see how they apply to all aspects to the J2EE environment. Some of those given here will be presented more fully. But for now, there are patterns and idioms specific to writing session EJBs. Reading this section might save you some time.

Business Interface

One of the peculiarities of the ...