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Greetings...
It's not often that we get to use adjectives like "small" and "simple"
when we talk about Java. The typical Java programmer often has to juggle a
bunch of classes and deployment descriptors to get an EJB happy, or craft
events, listeners, and fire methods to wire up a Swing component. And
using databases, trying to map Java objects to tables in a relational db,
is just another example. No wonder we needed Hibernate, even it takes some
wrangling.
But this week on ONJava, we feature some alternative approaches that,
depending on your needs, make things simple and clean.
Mapping relational database tables to Java objects usually involves a lot
of code, configuration, and a fair amount of trouble. The problem,
according to Jim Paterson, is one of "impedence mismatch": "the object
model is based on software engineering principles and models the objects
in the problem domain, while the relational model is based on mathematical
principles and organizes data for efficient storage and retrieval." But
for small applications with more modest needs, dropping relational
performance for object-orientation may be a good choice. In Simple Object
Persistence with the db4o Object Database, he introduces db4o, a small,
embeddable, object-oriented database with a particularly Java-friendly
API.
http://www.onjava.com/pub/a/onjava/2004/12/01/db4o.html
"At one time or another, however, most web developers have complained
about the limited capabilities when using a browser as a client." So
begins Mark Eagle, noting browsers' mutual incompatibilities, limited GUI
options, limited support for storing state, etc. The alternative is the
Rich Internet Application, which puts more presentation and logic on the
client side than is typically found in web applications. In Integrating
Macromedia Flex with Java, he shows how to use the Flash-based Flex as the
client-side of a Java based systems and notes which habits and perceptions
developers need to leave behind as they move to an RIA mindset.
http://www.onjava.com/pub/a/onjava/2004/12/01/flexjava.html
This week's book excerpt is from SWT: A Developer's Notebook, in which Tim
Hatton presents the Standard Widget Toolkit, the GUI framework that is the
basis of Eclipse and, increasingly, other Java desktop applications. In
Creating Toolbars Using SWT, he says, "the SWT provides you with
everything you need to create sophisticated toolbars, something your users
will expect in almost every application you deliver." The chapter develops
a fully responsive toolbar, with separators, tooltips, and radio- and
check-style buttons.
http://www.onjava.com/pub/a/onjava/excerpt/swt_ch4/index.html
Our feature article from java.net has the details of J2SE 5.0's support
for hardware accelerated graphics, something that should be of profound
interest to Java desktop application and game developers. In Behind the
Graphics2D: The OpenGL-based Pipeline, Chris Campbell writes that after
having a hard time explicitly stating what is and isn't accelerated by
5.0's OpenGL-enabled rendering pipeline, "I compiled this document to help
answer the hot question and explain all the caveats that developers might
encounter when they run their application with the OpenGL-based pipeline
enabled." Among the items covered is support for shapes, images, and text,
and how these are handled by OpenGL.
http://today.java.net/pub/a/today/2004/11/12/graphics2d.html
The ONJava Reader Survey remains open. This is your opportunity to speak
out on the tools you use, the topics that interest you, and the things
you'd like to see on ONJava in the coming year. As an added incentive,
five randomly chosen participants will win three O'Reilly books each.
Please join us again next week.
Chris Adamson, editor
ONJava.com
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