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Java User Groups

Multimethods in Clojure by Amit Rathore, author of Clojure in Action, Second Edition Clojure multimethods support not only multiple dispatch but much more. Indeed, once you look past multiple dispatch, a commonly asked question is whether a language can dispatch on things other than the types of values. With Clojure’s multimethods, methods can be made to dispatch based on any arbitrary rule....
on Feb 20, 2013
Node in a Nutshell by Alex Young and Marc Harter, authors of Node.js in Practice We live in a world of highly connected multicore servers, where web applications are expected to scale from dozens of users to millions. New demands are being placed on developers by the real-time nature of the modern web. Developers are looking for fresh solutions to solve scalability issues—whether it’s to take...
on Feb 18, 2013
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
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
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
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
Toward the end of JavaOne 2012, the Java.net editorial team spent an hour or so in the very windy Taylor Street Cafe (a closed street block with umbrellas, tables and chairs, coffee, etc.) with Oracle Ace Director Markus Eisele (@myfear). Markus is a technology consultant, architect, developer, author, and conference speaker. He's also active in communities including Java User Groups, the JBoss...
on Jan 7, 2013
Java.net home page manager Dale Farnham and I enjoyed the privilege of interviewing Juggy, the Java Finch, who really, really likes Java User Groups, and is incredibly appreciative of their efforts. Juggy, at this particular interview, was accompanied by Java evangelist and SouJava leader Bruno Souza (@brjavaman). Bruno's normally a pretty talkative guy. Strangely, though, throughout our entire...
on Dec 8, 2012
Has been 6 months, I part of the Azure Insider. I can test Azure here. Yes We have a lot of Cloud environment here, from OpenStack/CloudFoundry to VSphere/CloudFoundry, mostly all PaaS Related which I interest and see value for developer in PaaS World. anyway, there is an initiative related to Paas, called OpenPaaS, please visit http://www.openpaas.or.id. Several interesting work that we has made...
on Nov 6, 2012
Our Meruvian program (Called jTechnopreneur), now expand to the new highest reach level. Starting with diploma 6 years ago under JENI (www.jeni.or.id or www.jeni-academy.org), we move to jTechnopreneur in 3 years, and now, in 2012, we expand to middle school (13+) and also add Cloud Computing plus Responsive Web Design. You can also see our presentation for Meruvian Seamless Education PRogram in...
on Nov 5, 2012
Bugs are inevitable. Even after you thought you have finished coding your work, another bug creeps in, making you want to wish the bugs were real tangible objects that you could squish with your bare hands. Being a developer, you should be armed with the right weapons to battle bugs for they come almost all the time. In fact, they are building yet another Death Star. If you don't get vigilant,...
on Oct 24, 2012
Acceptance Test Driven Development (ATDD) is a method wherein business stakeholders, analysts, testers and developers collectively specify and agree on what needs to be completed in the project. Requirement specifications are set and verified even before actual development starts. This ensures that only those value-adding features are delivered to the business. Instead of validating after the...
on Oct 21, 2012

Java Desktop

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
Tuesday at Jfokus 2013 started in a large auditorium filled with more than 1500 Jfokus attendees, who heard Jfokus founder Mattias Karlsson launch the conference in an introduction that included an appearance by Stephen Chin, who had spent the previous night sailing the icy Baltic Ocean on the Vaadin Cruise from Finland. The conversation also introduced a new Java Champion, JRuby's Charles...
on Feb 5, 2013
After days work with my Raspberry PI, and a silly stuff happen here (for days i cannot install the .img to my SD Card, because the white button in my SD Extender in write protected mode).. Yes, now working well.. I tought I got the unworking Raspberry PI.. hahaha. Now I am working with Java on ARM anyway. But I got Zero JVM for ARM... (Still working to install in my wheezy environment, there is a...
on Jan 12, 2013
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
Defining Functional Data Structures by Paul Chiusano and Rúnar Bjarnason, authors of Functional Programming in Scala Functional programs do not update variables or modify data structures. This raises pressing questions—what sort of data structures we use in functional programming, how do we define them can in Scala, and how do we operate over these data structures? This article,...
on Nov 26, 2012
The Foundations of Mobile First Design by Matthew Carver, author of The Responsive Web In this article from The Responsive Web, author Matthew Carver opens up a discussion of how to build a site for a mobile or small-screen device using a graphic design program, such as Photoshop. Building a site in its smallest iteration first affords the designer a lot of opportunities. By starting in a...
on Nov 14, 2012
Natural User Interaction with Drag-and-Drop by Rob Crowther, author of Hello! HTML5 and CSS3 The HTML5 spec is ground-breaking in many ways, but one of the key ways is that it specifies both the syntax of the HTML markup and the APIs you should use to manipulate the document with JavaScript. In this article from Hello! HTML5 & CSS3, author Rob Crowther discusses simulating desktop-like...
on Oct 29, 2012
From 0 to First Hit with Grails Support by Glen Smith and Peter Ledbrook, authors of Grails in Action, Second Edition Grails is a next-generation Java web development framework that generates great developer productivity gains through the confluence of a dynamic language, a Convention over Configuration philosophy, powerfully pragmatic supporting tools, and an agile perspective drawn from the...
on Oct 25, 2012