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Unit Tests for EJBs, Decorating as a Way of Extension

by chromatic
ONJava Newsletter for 02/06/2003

Dear Readers,

Welcome to yet another ONJava.com newsletter. It's a chilly but sunny morning here at O'Reilly headquarters in Sebastopol, California, but nothing will stop this newsletter now. This week, we have two interesting articles to educate, inform, and entertain you.

The Java community has taken to unit testing like a linebacker to a buffet. JUnit's widely used, and the unit-testing folks love to write examples in Java. That doesn't mean testing everything is immediately obvious. A new author, JiRong Hu, has been thinking about EJBs lately. He presents a way to test them in Automating EJB Unit Testing.

One of the cornerstones of object-oriented programming is the notion of polymorphism--and inheritance is, possibly, the most common way to take advantage of this. Any two objects that act alike (on a semantic level) can be substituted for each other. Of course, inheritance has its drawbacks. Budi Kurniawan presents the Decorator pattern and demonstrates how to modify the behavior of an object without subclassing it. That's not all. Read more in Using the Decorator Pattern.

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There's just over one week left to submit your proposals for OSCON 2003. It's probably rainy and definitely overcast there now, but come July, it'll be clear, warm, and lovely in Portland--and filled with buzz about your favorite open source Java (and non-Java) projects. Act now.

Next week, our book excerpts will return. Find out who did it in the stunning conclusion of Java Swing. (After that, perhaps we'll take a tour through more Java Enterprise Best Practices.)

Until then,

chromatic
O'Reilly Network Technical Editor
chromatic@oreilly.com

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