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Greetings...
So, maybe code reuse isn't a red herring after all. With so much generally
useful code being offered up by open source repositories like java.net,
SourceForge, Apache Commons, and others, it seems like people are finally
figuring out that it's easier to download a jar and learn someone else's
API than to reinvent the wheel. And if the common package doesn't have
some esoteric feature you need, well, that's what feature requests are
for, right?
Lorenzo Puccetti says that code reuse has reached a critical juncture:
"what we need now is a tool that blends separately developed components
into a well-crafted finished product; a tool that protects major
subsystems of the architecture from each other." In "Building Modular
Applications with Seppia," he introduces Seppia, an open source project
that lets you build applications from existing jar-based collections of
java code, stitching the pieces together with JavaScript.
http://www.onjava.com/pub/a/onjava/2005/03/16/seppia.html
Introducing code into a deployed system is fraught with peril, when such
activity is permitted at all. That it is facilitated with Aspect-Oriented
Programming (AOP) is of little help if the structure of the code increases
the chance of unexpected results. In "Reducing Upgrade Risk with Aspect
Oriented Programming," Stephen B. Morris shows how the classic Observer
design pattern can be used to separate concerns in the code, making it
easier for the AOP-inserted code to operate safely and without side
effects.
http://www.onjava.com/pub/a/onjava/2005/03/16/aop-mgmt.html
Java has been built for the network from day one. Unfortunately, day one
was apparently the last time anyone upgraded some of its low-level
features, like its HTTP support. Ry4an Brase and Chad Tippin have an
alternative: "SwarmStream Public Edition augments Java's built-in HTTP
networking implementation with support for automatic retries while
providing a great many additional features, such as download acceleration,
resume support, and disconnected operation." In "SwarmStream: A
Next-Generation HTTP Stack for Java," they show how to bring its improved
HTTP support to your Java application.
http://www.onjava.com/pub/a/onjava/2005/03/16/swarmstream.html
In this week's feature article from java.net, Tom Marrs and Scott Davis
have the JBoss introduction for those of you who say, "I don't want to be
an expert in it--I just want to make it work." These coauthors of
O'Reilly's upcoming "JBoss at Work: A Practical Guide" are writing a
three-part series on getting JBoss up and running. In "JBoss at Work,
Part 1: Installing and Configuring JBoss," they cover downloading and
installing JBoss, explore its directory structure, and show how to deploy
an application to JBoss.
http://today.java.net/pub/a/today/2005/03/01/InstallingJBoss.html
Please join us again next week.
Chris Adamson,editor
ONJava.com
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