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Programming

Our books are great. But don’t just trust us; here are some reviews from developers who have actually bought, read and loved the books. Trust them! Clojure Made Simple – John Stevenson Great first step into Clojure, a pleasure to read – Sisu **** 4 Stars I’m new to Clojure, and rather than coming to grips immediately with functional programming for large projects, I wanted to get familiar with...
on Jul 29, 2013
In Java development, we may encounter the complex set operations. Java alone is not powerful enough to save programmers’ efforts in implementing the computation details, which is time-consuming and poor in code reuse. In view of this, programmers usually resort to dynamic calculation script for set operation. SQL is surely the first kind of script that comes into most programmers’ mind. However,...
on Jul 16, 2013
How much code documentation is a symptom of bad coding (i.e. poor method or variables names, poor class or package structure, missing logging, etc)?
on Jul 15, 2013
What should be in a source control commit message for a single file add? Ideas: Reason: The reason for the file should be in a comment in a file so it would be a duplicate to also include in the commit message. File add: Already part of the commit Issue identifier From http://jamesjava.blogspot.com/2012/11/source-control-message-for-single-file.html
on Jul 15, 2013

Community

Do you know who my current hero is? Jono Bacon. Even for you coders/developers, he's a hand you should shake. He gets community leaders together to think about their community and ways to help it to be better. He helps us to help you, and it's more important than I had realized. CLS was an amazing opportunity for me to listen to and discuss questions on the non-tech side, which helps me to be...
on Jul 25, 2013

Tools

Recently, I read Why Big Data Projects Fail by Stephen Brobst. I can’t agree more with his opinions which exposed the problem I’ve been worried about. In this article, I am going to further discuss this topic to remind the enterprises to beware of falling into such pitfall of failure. Let’s have a look on a positive example. As a successful enterprise in leveraging big data, how does Google make...
on Jul 24, 2013

Patterns

What are the cost vs. benefits of creating interfaces and how should they be balanced? I am only considering cases where interfaces are optional and aren’t needed. Benefits: Simplify interaction: Easier to see how to use a List than an ArrayList Make testing easier because replacement implementations can be used Can make future changes easier Costs: Harder to understand what the code is doing...
on Jul 15, 2013

Security

Is it more secure to allow the browser to save a website password or prohibit the browser from saving the password? Benefits of allow the browser to save the password: Spoof websites are more easily detected because the username and password don't show up (this may be a mute point if the username is saved but not the password). Keyloggers won't pick up the password if you don't type it. (Thanks...
on Jul 15, 2013
HTML5 brings new opportunities – for developers and for attackers. Here you will see two examples of how an attacker could abuse HTML5 and how you as a developer could prevent this (or not). These are only two of many new or improved attacks on web clients. I chose them for two reasons: the first is a new attack, first described in December 2011 and not widely known to developers. The second...
on Jun 4, 2013

Performance

Could java.util.concurrent.lock.Lock use a static list of all threads that have locks and ThreadLocal locks lists to know about all in use locks and then check for incorrect order when lock() is called. Consider: In lock: Check the ThreadLocal list and if there are no other locks then proceed. Else if there are other locks then look through other threads to determine if any have any of the same...
on Jul 15, 2013

Databases

The Browser Binding with a CMIS Repository By Florian Müller, Jay Brown, and Jeff Potts, authors of CMIS and Apache Chemistry in Action A big part of the CMIS specification describes how the CMIS domain model is mapped to the bytes that are transferred. These mappings are called bindings. CMIS 1.0 defines two bindings, the Web Services...
on Jul 2, 2013

Servlets

Expression Language (EL) was first introduced as part of JSTL 1.0, was then moved JSP 2.0 and was unified with JSF 1.2 in JSP 2.1. In Java EE 7, EL is a new separate JSR, JSR 341. Many new features are introduced in EL 3.0. This blog shows how to use new following new features of EL 3.0: Standalone environment Lambda expression (section 1.20 of EL 3.0 spec) The new operator ; to separate...
on Jul 1, 2013
Asynchronous operation was introduced in Servlet 3.0. ServletRequest#startAsync is used to put the request into asynchronous mode. A thread need to be created implicitly or explicitly (see here for an example). Servlet 3.1, JSR 340 includes clarifications in asynchronous area. Besides Servlet 3,1, Concurreny Utilities for Java EE 1.0, JSR 236 is introduced in Java EE 7. JSR 236 provides a...
on Jun 6, 2013

Blogging

How did you first get into developing / coding? My first encounter with a computer was in 1987 during a physics class. This particular one (a Commodore C64) went immediately to my Xmas wish list. When I teared away the gift wrapping, I found the datasette broken. A datasette was a tape drive using audio cassettes for storage – without it, there were no chance to play any of the bundled games;...
on Jun 24, 2013
Sebastiano Armeli-Battana is the author of the successful 'MVC Applies to JavaScript' eBook. We thought we'd get to know a little more about the author! 1. For someone that’s new to the JavaScript sector, can you explain why they should use MVC? I would say that a JS noob should use MVC, just because it’s widely spread pattern used across different programming languages. I think they would enjoy...
on Jun 14, 2013

Games

Over the last few years we've been busily writing the latest and greatest version of Magnolia. After all of this focus on new and (we hope) great, it seemed like time to focuse on something old and great. If you are old enough to remember the ZX Spectrum, the Commodore 64 or their various competitors, or if you like any kind of games, please keep on reading. You might have heard of the qaop...
on Jun 20, 2013

Education

Using Throws and Throw Statements in Java By Mala Gupta, author of OCP Java SE 7 Programmer II Certification Guide In this article, based on chapter 1 of OCP Java SE 7 Programmer II Certification Guide, author Mala Gupta explains how to define methods that throw exceptions, the different combinations of defining overriding methods, and when the overridden or overriding methods...
on Jun 13, 2013
Test Driven Development (TDD) has become a cornerstone of modern software craftsmanship. Behaviour Driven Development (BDD) takes it to the next level; it provides easier to use and a more readable syntax as well as many other improvements. If you haven't used Test Driven Development before, start with BDD, you will reap the benefits much faster. This book is a hands-on introduction on BDD. Using...
on Jun 12, 2013

Web Applications

Backbone.js: In the Beginning, There Was JavaScript by Samuel M. Breed, author of Backbone.js in Action Backbone is a library for structuring web applications. Since the dawn of the Internet, forward thinking developers have known that it is more than just a means of serving static HTML documents, but rather a platform made for applications. JavaScript has evolved into an ecosystem that's...
on Jun 6, 2013