Java Archive

"Data validation is a common chore in programming any user interface. The Java language's regular-expression support can make data validation easier. You can define a regular expression that describes valid data and then let the Java runtime see if it matches. But certain types of data have different formats in different locales. The ResourceBundle class lets you work with locale-specific data in an elegant way. This article shows how to combine the two techniques to solve a common data-entry problem."

The Mobile 3D Graphics API retained mode lets you work with a scene graph representation of your 3D world. This article, the second of a two-part series, describes just that -- an easy way to manage your 3D objects. Immediate mode renders 3D objects directly on the screen. Retained mode, on the other hand, lets you build a scene graph that you can manipulate and render at a later time.

Although it is possible to use Core Data with little or no coding on your part, what if you want or need more fine-grained control over the persistence layer in your application? Marcus Zarra walks you through some of the more advanced features of Core Data.

"Clustering allows an application server to support multiple nodes with failover, session data sharing, and load balancing across many network nodes. This article provides details, direct from Apache Geronimo clustering effort team leader, Jeff Genender. Find out who is working on the details, how they work together to get the code written, and the ramifications these efforts are having on the open source community."

Sun's groundbreaking programming language vaulted to popularity with Web developers. But now it's losing ground to a raft of upstarts.

Design patterns help users to abstract details at a higher level and better understand architecture. If you are familiar with Gang of Four design patterns and the JavaServer Faces (JSF)framework in general, this article will help you gain insight about the design patterns used in JSF framework, and how they work in-depth.

What if you could combine Cocoa (that easy-to-use extension to C that is the primary language used for development on the OS X platform) and Java (one of the most widely used languages on the Internet) to create an OS X native application that utilizes the power of Java's libraries? Marcus Zarra does just that in this latest article in his series on Cocoa from the Java developer's perspective.

The Apache Geronimo application server supports Web services along with other aspects of the latest Java 2 Platform, Enterprise Edition specification. This article describes how to use Web services facilities provided by the Apache Geronimo application server to build Web services-enabled J2EE applications. It demonstrates how the Geronimo application server relies on robust support for J2EE standards, providing a number of facilities for building both Web services and their clients.

Most developers (and the general public, for that matter) haven't yet gotten the idea that the next step in wireless applications is going to be all about location. Mologogo uses GoogleMaps with a Java and a GPS-enabled cell phone to show a target phone's position on a GoogleMap, allowing you to track it from your own phone or through the Web. This artcle provides insight into Mologogo and other Web 2.0 contenders and their privacy issues.

"For the last couple of years the community has been working to ensure that developers can create applications using Java without having to depend on proprietary software. Today, the Free implementations are already very capable and support a vast amount of functionality that developers expect from a Java-like environment. Important large applications like JOnAS, OpenOffice.org 2, Eclipse 3 and Tomcat 5 are known to work and now included in distributions like Ubuntu and Fedora Core. This document provides a road map of the various projects; how they work together, where they are, where they're going, and how we make sure that they work well and are compatible."

"It's official. Java has taken the top spot away from C++ to become the top language on SourceForge. Mats Henricson points out in his blog that as of yesterday, Java has 16738 projects on SourceForge, compared to the 16731 of C++."

While programs in the Java language are theoretically immune from memory leaks, there are situations in which objects are not garbage collected even though they are no longer part of the program's logical state. This article explores a common cause of unintentional object retention and shows how to plug the leak with weak references.

Sun and Microsoft engineers continue to work on up-the-stack interop between Java and .NET. Sun pledged to enable Java interop to Microsoft’s Windows Communication Foundation (WCF) by developing and distributing open source implementations of key WS-specs.

KVO? KVC? Say what? Key-Value Observing and Key-Value Coding, that's what. As an introduction to Apple's new Cocoa/Objective-C API called Core Data, Marcus Zarra shows you why KVO/KVC is an incredibly useful feature in its own right and deserves the attention of any developer new to the Cocoa/Objective-C arena.