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Greetings...
It's a little odd to be writing this week's newsletter on my wife's
computer, as my laptop seems to have gone off to that great iBook Recall
in the Sky. Such are the hazards of having all the data I need in one,
easily disabled place.
Speaking of the unexpected, Satya Komatineni threw me for a loop with his
article on how static initializers work. In a section of his
"Understanding the Interplay Between Utility Classes and Static
Initialization", he shows how you can write static initializers that are
*not* run when you access variables in their superclasses. Taken a little
further, it's easy to mistakenly assume that shared fields accessed as
statics are initialized when they may not be. His solution is that "the
unwanted dependency demonstrated so far can be broken by using a holder
class that can hold the single resource," which leads to a new pattern,
the Static Resource Holder, which can manage the static resource and
ensure it is initialized correctly.
http://www.onjava.com/pub/a/onjava/2004/09/15/statics.html
Deepak Vohra is back with an article on straightening out your XML by
validating it against a schema. In "XML Document Validation with an XML
Schema" he explains, "an XML schema defines the structure of the elements
and attributes in an XML document. For an XML document to be valid based
on an XML schema, the XML document has to be validated against the XML
schema." The article then shows how to configure and use JAXP and
Xerces2-j parsers.
http://www.onjava.com/pub/a/onjava/2004/09/15/schema-validation.html
This week we have an excerpt from "Enterprise JavaBeans, 4th Edition" by
Bill Burke, Richard Monson-Haefel, and Sacha Labourey. In "Developing
Your First Enterprise Beans, Part 1", the authors walk through defining
an EJB's interfaces and implementation class as well as creating the
deployment descriptor. They also show how to jar up the file, build its
needed database table, and deploy the EJB.
http://www.onjava.com/pub/a/onjava/excerpt/ejb4_chap4/index.html
In this week's feature article from java.net, Simon Brown continues his
examination of TagUnit, an open source testing tool for JSP custom tags.
In "Introduction to Tag Unit, Part 2", he shows how to build tests, test
cases, and test suites, as well as testing JSTL, interfaces, and fixed
loops. He says that "in conjunction with other testing tools, TagUnit
provides a way to help test more of your J2EE web applications."
http://today.java.net/pub/a/today/2004/08/30/TagUnitIntro.html
Please join us next week as we spiff up our JSP pages with SiteMesh.
Chris Adamson
Editor, ONJava
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