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Databases

Spatial reference system: What is it? by Regina O. Obe and Leo S. Hsu, authors of PostGIS in Action, Second Edition The topic of spatial reference systems (SRS) is one of the more abstruse in GIS to understand. This is mainly due to the loose way in which people use the term spatial reference system and secondly to its unglamorous nature compared to other areas of GIS. If GIS is Disneyland,...
on Feb 13, 2013
Many of the Oracle Java development tutorials that access a database do so against the Oracle HR sample schema. See, for example, Developing Rich Web Applications With Oracle ADF. There are several approaches you can take to getting the sample schema installed in the Oracle Cloud, such as Using SQL Developer or JDeveloper as demonstrated in Shay's blog. In my case, we're going to run the SQL...
on Jan 17, 2013

Programming

Akka and Camel by Claus Ibsen and Jonathan Anstey, authors of Camel in Action Akka comes with a Camel integration module that allows Akka actors to interact with communication partners over a great variety of protocols and APIs. In this article, based on appendix E of Camel in Action, contributing author Martin Krasser presents selected Akka-Camel integration features by example. Akka aims to...
on Feb 13, 2013
Sometimes, life drops a house on your code. Sometimes, it's flying monkeys. Most of the time though, the damn stuff just stops working and it's nothing so obvious as being crushed by a Kansas farmhouse or being carried away by winged primates. For this last common case, there are a good number of great tools to help you out. JMeter may help you to reproduce the conditions under load, while...
on Feb 1, 2013
Operator Overloading by Chris Buckett, author of Dart in Action Overloading happens when you provide a new implementation customized to your particular class, which allows you to overload the common operators such as > (greater than) and < (less than). In this article, based on chapter 8 of Dart in Action, author Chris Buckett explains how this function helps you create truly self-...
on Jan 11, 2013

J2EE

If you have wanted JSF not to store any state now is your chance to try out the stateless mode of JSF. It is as easy as doing the following: &lt;f:view transient="true">  Your regular content&lt;/f:view> And voila you are running stateless. If you decide you do want some state to be kept at the server you can use the @xxxScoped annotations on your beans Be aware that...
on Feb 8, 2013
Whenever the JSF runtime needs to perform a conversion it uses a Converter to do so. As explained in previous blog entries you have the ability to implement your own Converter. But does that mean you need to implement it for simple conversions? No, you do not, the default JSF converters come to the rescue!   <b>Java Datatype</b>        ...
on Dec 26, 2012
The following blog articles are part of the JSF State Saving series Introduction to JSF State Saving The JSF State Saving APIs The JSF StateHolder API The JSF PartialStateHolder API The StateHelper API
on Dec 19, 2012

Blogging

The Fundamentals of a JavaScript Test Suite by John Resig and Bear Bibeault, authors of Secrets of the JavaScript Ninja As important as a solid testing strategy is for all code, it can be crucial for situations where external factors have the potential to affect the operation of your code, which is exactly the case you're faced with in cross-browser JavaScript development. In this article...
on Feb 7, 2013
What is SPARQL? by David Wood, Marsha Zaidman, Luke Ruth, and Michael Hausenblas, authors of Linked Data SPARQL is the query language for RDF and Linked Data. SPARQL is to RDF data as the Structured Query Language (SQL) is to a relational database. SPARQL's name is nicely pronounceable and sounds interesting and fresh. SPARQL is interesting and fresh. This article, based on chapter 5 from...
on Dec 20, 2012
Six Ways You're Using Responsive Design Wrong by Matthew Carver, author of The Responsive Web Staying on the cutting edge of of web design can be tough, and oftentimes you only learn from making mistakes. Making mistakes is sometimes the best way to know that you are breaking new ground. In this article, Matthew Carver, the author of The Responsive Web, gives a few tips that his experience in...
on Dec 19, 2012

Community

I arrived in Stockholm on Sunday morning and checked into my hotel which is directly connected to the conference center. It is hugely convenient to not have to go play in the snow if I need to run back to my room for something. The conference started with several hands-on-labs on Monday. I didn't attend, but peeking in the windows indicates that they were standing room only. I spent the...
on Feb 5, 2013
   In last week was born the SouJavaLivre in Brazil, its main objective is disseminating and help to envolve the java free and  the OpenJDK in country. For does that there are some sub-projects:    Support to Adopt OpenJDK : With list in Portuguese also some tutorial in Portuguese to help the people to adopt the JVM's reference, but helping and with integration...
on Jan 22, 2013
In my last blog post, I explained how to add versioning capability to templates. Being able to create, view and restore different versions of templates is great, but sometimes it's not so easy to see what has actually changed. And we might not be as lucky as having comments about the change from the author, or they might be cryptic to the point of being useless. So let's try and add the diff and...
on Jan 22, 2013
Some time ago, I had the impression that everywhere I stepped in the endless Java universe, I came across rather outdated technology. Things that were hyped years back, but for some reason had been left behind by mankind in the course of time. Disenchantedly roaming that programming desert I almost went depressive looking at all the rusty wrecks of former featured APIs laying around all along....
on Jan 1, 2013

Virtual Machine

Understanding Coercion by Michael Fogus and Chris Housen, authors of The Joy of Clojure In many cases, Clojure's compiler will be able to highly optimize idiomatic Clojure source code. But there are times when the form of your functions, especially in interoperability scenarios, will prove to be ambiguous or even outright counter to compiler optimizations. In this article, based on chapter 12...
on Jan 30, 2013

GUI

I am pleased to announce the release of SwingX 1.6.5. The new release is available in Maven central. As always, you may report bugs or request new feature via JIRA. You may also contact us in the discussion forum. Release Notes - SwingX - Version 1.6.5 Bug [SWINGX-1336] - Flickering in JXPanel with alpha < 1 [SWINGX-1449] - JXButton doesn't update font if...
on Jan 29, 2013

Web Development Tools

As a test, I re-created the HRSystem application as described in the tutorial Developing Rich Web Applications With Oracle ADF. It's more than your basic Hello World application. For starters, the HR system application accesses a database. It also takes advantage of some sophisticated ADF features, such as graphs, page flows, auto-suggest, menu options to export to Excel and display in...
on Jan 23, 2013

Security

A quick, hopefully readable analysis of this week's security exploit and fix over at my new blog
on Jan 15, 2013

Distributed

I introduced myself to Konstantin Shvachko after hearing him speak in the Duke's Choice Awards BOF session at JavaOne 2012 (Hadoop was a 2012 award winner). Konstantin happened to be sitting right next to me in the audience, so before we exited the session, I asked him if we could arrange a chat before JavaOne ended. You've probably heard of Hadoop, but a great many likely don't know much...
on Dec 16, 2012