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An introduction to Kafka
An introduction to one of the most popular platforms for distributed messaging or streaming data.
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Articles 05 Jun 2018
Using data science to manage a software project in a GitHub organization, Part 1: Create a data science project from scratch
In this two-part series, I explain how to find project management insights from a GitHub organization and how to create and publish tools to the Python Package Index.
Also available in: Chinese  
Articles 13 Nov 2017
Social power, influence, and performance in the NBA, Part 2: Exploring the individual NBA players
In this tutorial series, learn how to analyze how social media affects the NBA using Python, pandas, Jupyter Notebooks, and a touch of R. Part 2 explores individual athletes in the NBA: endorsement data, true on-the-court performance, and social power with Twitter and Wikipedia.
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Articles 06 Sep 2017
Write runnable and deployable code for the IBM Cloud Functions platform
One of the great things about the developerWorks sandbox is that you can run your code in the browser or deploy it to Bluemix. Your deployed code is an action on the IBM Cloud Functions platform. However, the Cloud Functions platform requires your JavaScript or Java code to support a particular interface before you can deploy it. This tutorial explains the rules and requirements to make everything work.
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Articles 10 Jul 2017
5 things you didn't know about ...: Apache Maven
You might be familiar with profiles, but did you know that you can use them in Maven to execute specific behaviors in different environments? This installment in the 5 things series looks beyond Maven's build features, and even its basic tools for managing the project life cycle, delivering five tips that will improve the productivity and ease with which you manage applications in Maven.
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Articles 17 May 2017
The busy JavaScript developer's guide to LoopBack, Part 2: Models
In Part 2 of this series on the LoopBack framework, learn how to define and use models and data sources as you walk through the development of a basic web API.
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Articles 24 Apr 2017
The busy JavaScript developer's guide to LoopBack, Part 1: Hello, World!
LoopBack is one of many open source Node.js frameworks that have recently rebooted the possibilities for server-side JavaScript development. Set up LoopBack in your development environment, then write your first LoopBack API using the command line and IBM API Connect, an API lifecycle management platform.
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Articles 07 Mar 2017
Quantum computing for everyone, a programmer’s perspective
About a week ago, IBM launched Quantum Experience. The cornerstone of this initiative is to make a real, working quantum computer available for anyone. This blog discusses Quantum Experience, gives the basics while trying to dwell as little as possible on Algebra or Physics and, at the end, we’ll build a simple algorithm and discuss the results.
Blog 21 Feb 2017
Modularize Angular applications with webpack
Modularizing an AngularJS application makes the code base easier to maintain as your project grows. Learn how to modularize an existing Angular application with the webpack module bundler, and learn best practices for incorporating modules into a new project.
Also available in: Chinese  
Tutorial 29 Jun 2016
Playful web development, Part 1: Manage user authentication with the Play Framework and Scala
Implement user management for your Play Framework applications and put your Scala skills to work. Pablo Pedemonte takes you through building a basic Play application that handles authentication and authorization. You can even use the application code as a starter for your own Play projects to shorten user-management development time.
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Articles 12 Nov 2015
JVM concurrency: Building actor applications with Akka
Actor applications require a different style of programming from the linear approach that is used for single-threaded applications. Go deeper into structuring systems in terms of actors and messages from Scala code, using the Akka toolkit and runtime.
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Articles 12 Aug 2015
Bluemix demo at the Cloud World Forum 2015
Ed Shee, Cloud Software Specialist for IBM Bluemix, walks through a quick 3-minute demo on creating an application in the cloud with IBM Bluemix utilizing Watson Personality Insights. He shows how easy it is to provision a boilerplate -- a runtime, a service, and some starter code all bundled together.
Videos 04 Aug 2015
IBM@OSCON 2015: Let's work together
IBM is a longtime supporter of open source software and the open source community and is once again a prominent presence at the annual OSCON conference. This article provides an overview of IBM's activities during this year's event. You'll also get a glimpse of developerWorks Open, a new way to collaborate on and develop tomorrow's next innovations.
Articles 23 Jul 2015
JVM concurrency: Acting asynchronously with Akka
The actor model, a long-established approach to concurrent programming, gives you an easy way to build applications for high concurrency and scalability. Learn about the actor model and start working in Scala or Java with the Akka implementation of the model.
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Articles 08 Apr 2015
Mastering MEAN: Introducing the MEAN stack
Build a modern web application with MongoDB, Express, AngularJS, and Node.js in this six-part series by web development expert Scott Davis. This first installment includes a demo, sample code, and full instructions for creating a basic MEAN application. You'll also learn about Yeoman generators that you can use to bootstrap a new MEAN application quickly and easily.
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Articles 09 Sep 2014
JVM concurrency: Asynchronous event handling in Scala
Scala Future and Promise classes give you powerful ways to handle asynchronous processing, including nonblocking ways to organize and sequence events. The async / await constructs, implemented as a macro, make it even easier to write nonblocking event handling in Scala. This tutorial shows you the basic Future and Promise techniques in action, then demonstrates how async / await can convert what looks like simple blocking code to nonblocking execution.
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Articles 02 Sep 2014
Build a real-time polls application with Node.js, Express, AngularJS, and MongoDB
Build a polling application that updates in real-time as votes roll in. The app I created has a simple architecture that uses JavaScript for everything. Node.js and Express power the back-end, and MongoDB stores the app's data. At the front-end, AngularJS and Bootstrap power the user interface, with Web Sockets enabling the voting to update clients in real-time.
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Articles 27 Jun 2014
Build a simple notification service with Node.js and MongoDB
Need to corral a large, disparate set of tools across development groups? Try using a notification service to create, signal, and subscribe to events. It's not hard. I'll walk you through it.
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Articles 27 Jun 2014
Extract information from the web with Ruby
Explore the latest methods for extracting structured information from the web. Using Ruby script examples, author M. Tim Jones demonstrates scraping technology and the use of web APIs for targeted data retrieval.
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Articles 17 Dec 2013
Recommender systems, Part 1: Introduction to approaches and algorithms
Most large-scale commercial and social websites recommend options, such as products or people to connect with, to users. Recommendation engines sort through massive amounts of data to identify potential user preferences. This article, the first in a two-part series, explains the ideas behind recommendation systems and introduces you to the algorithms that power them. In Part 2, learn about some open source recommendation engines you can put to work.
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Articles 12 Dec 2013
Recommender systems, Part 2: Introducing open source engines
Part 1 of this series introduces the basic approaches and algorithms for the construction of recommendation engines. This concluding installment explores some open source solutions for building recommendation systems and demonstrates the use of two of them. The author also shows how to develop a simple clustering application in Ruby and apply it to sample data.
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Articles 12 Dec 2013
Oozie workflow scheduler for Hadoop
Big data in its raw form rarely satisfies the Hadoop developer's data requirements for performing data processing tasks. Different extract/transform/load (ETL) and pre-processing operations are usually needed before starting any actual processing jobs. Oozie is a framework that helps automate this process and codify this work into repeatable units or workflows that can be reused over time without the need to write any new code or steps. Learn how Oozie can be used to create different types of workflows.
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Articles 19 Nov 2013
Recover from a failed Linux boot
If your Linux computer fails to boot after a kernel upgrade, disk swap, or other system change, you're not helpless. The Grand Unified Bootloader (GRUB) gives you ways to control the boot process and recover. Or, if necessary, emergency boot disks that you create with an external tool can come to the rescue. Learn procedures and GRUB commands that can help you boot in problem situations, and find out about a life-saving external tool for BIOS-based systems.
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Articles 22 Oct 2013
Build server-cluster-aware Java applications
Server clustering has become commonplace for highly scalable Java enterprise application development, but application-level server-cluster awareness is not currently part of Java EE. In this article, Mukul Gupta and Paresh Paladiya show you how to leverage two open source projects, Apache ZooKeeper and LinkedIn's Project Norbert, for server-group coordination in distributed enterprise Java applications.
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Articles 27 Aug 2013
Develop Spring Redis applications
Redis is a key-value NoSQL datastore solution. Spring Data Redis is a Spring portfolio project that helps Java developers build Spring applications with Redis, without needing to work directly with the low-level Redis API. This article introduces Redis and then shows how to build a simple dictionary application by using the Spring Data Redis API.
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Articles 21 Aug 2013
Create LaTeX documents graphically with LyX
LyX is a graphical tool, with a familiar drop-down and content-driven menu system, for writing and editing LaTeX documents. TeX and its higher-level macro language, LaTeX, are powerful document markup languages that are the de facto standard for Linux users. New users can find them difficult to work with because you must know the available markup tags, the contexts they can be used in, and how to use a text editor and previewing tool. LyX simplifies the entire process of working with LaTeX documents not just on Linux. Learn how to install, use, and customize LyX on Linux, UNIX, Windows, and Mac OS X systems.
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Articles 16 Aug 2013
Automated testing with Selenium and Cucumber
Take the pain out of test automation with Selenium and Cucumber, by learning to write tests in simple feature files and drive them through your browser with the flip of a switch. This article is a hands-on introduction to setting up a test automation framework with Selenium and Cucumber, creating a test suite for single-page web applications, and running tests across multiple web and mobile browsers via Selenium Grid.
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Articles 06 Aug 2013
Java.next: Common ground in Groovy, Scala, and Clojure, Part 1
The Java.next languages (Groovy, Scala, and Clojure) have more commonalities than differences, converging toward common ground in many of their features and conveniences. This installment explores how they each address a longstanding deficiency in the Java language -- the inability to overload operators. It also discusses the related concepts of associativity and precedence.
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Articles 14 May 2013
Get started with GeoServer and its REST API
GeoServer is an open source server for managing geographic information system (GIS) data sources and serving them easily through Web Feature Service (WFS) and Web Map Service (WMS) web services. It includes a comprehensive Representational State Transfer (REST) API for managing data at run time from complex web applications without manual intervention, and it works well in tandem with the OpenLayers mapping tool. This article introduces and explores GeoServer, including the benefits of creating a PHP wrapper class for the API.
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Articles 30 Apr 2013
Linear optimization in Python, Part 2: Build a scalable architecture in the cloud
Creating scalable and parallelizable code in a scripting language like Python requires careful thought. This series explores ways to model optimization applications in Python using Pyomo, an open source tool that can be used to define symbolic problems, create concrete problem instances, and solve these instances with standard solvers. Part 1 covers the basics of modeling optimization applications using Pyomo and Python. This article shows how to scale a Python linear optimization horizontally by combining Pyomo with the Tornado web server, and using RabbitHQ as the message bus between the layers.
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Articles 20 Feb 2013
Working with XML on Android
Android is a modern, open source operating system and SDK for mobile devices. With it you can create powerful mobile applications. This becomes even more attractive when your applications can access Web services, which means you need to speak the language of the Web: XML. In this article, you will see different options for working with XML on Android and how to use them to build your own Android applications.
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Articles 01 Feb 2013
Integrating PHP applications with Instagram, Part 1
Instagram is a popular photo-sharing service that enables users to take photos with their smartphone and share them with others through the Web. Application developers can search and retrieve these photos, together with their associated comments and likes, through the Instagram REST API. This two-part article introduces the Instagram API and illustrates how it can be used with PHP to leverage Instagram's rich repository of user-generated content and create innovative web applications.
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Articles 01 Feb 2013
Learning PHP, Part 2: Upload files and use XML or JSON to store and display file information
This tutorial is Part 2 of a three-part "Learning PHP" series teaching you how to use PHP through building a simple workflow application. Take this tutorial if you have a basic understanding of PHP and want to learn about uploading files from the browser, sessions, or using PHP to process XML or JSON.
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Tutorial 03 Jan 2013
Learning PHP, Part 3: Authentication, objects, exceptions, and streaming
This tutorial is Part 3 of a three-part "Learning PHP" series that teaches you how to use PHP through building a simple workflow application. In this tutorial, you will learn about using HTTP authentication, streaming files, object properties and methods, and how to create objects and exceptions. You'll also learn how to perform additional security checks for downloads.
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Tutorial 03 Jan 2013
Generate PDF files from Java applications dynamically
If your application needs to generate PDF documents dynamically, you need the iText library. The open source iText library makes PDF creation a snap. This article introduces iText and gives a step-by-step guide to using it to generate PDF documents from Java technology applications. We create a sample application to better understand iText.
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Articles 12 Dec 2012
Create REST applications with the Slim micro-framework
Slim is a full-featured, open source micro-framework for PHP application development. It comes with a sophisticated URL router and middleware architecture that makes it ideal for static websites or API prototyping. This article examines Slim in detail, illustrating how you can use it to rapidly build and deploy a REST API with support for authentication and multiple request/response formats.
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Articles 11 Dec 2012
The Direct Project: Sending health information over the cloud
Promoting interoperable and meaningful use of electronic health record (EHR) systems is one of the major goals of the federal government's healthcare reform, and the Direct Project is one of its most promising initiatives. Get started with this peer-to-peer protocol for sending sensitive patient information over the cloud, then find out how to use Direct Sender, an open source, Java-based client, to send secure email in health IT systems.
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Articles 06 Nov 2012
Learning PHP, Part 1: Register for an account, upload files for approval, and view and download approved files
This tutorial is Part 1 of a three-part "Learning PHP" series teaching you how to use PHP through building a simple workflow application. This tutorial walks you through creating a basic PHP page using HTML forms and covers accessing databases.
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Tutorial 23 Oct 2012
HTML5 2D game development: Graphics and animation
In this series, HTML5 maven David Geary shows you how to implement an HTML5 2D video game one step at a time. This installment covers Canvas graphics and HTML5 animation. You'll see how to draw the game's graphics and how to set them in motion. You will also learn the best way to animate with HTML5, how to scroll the background, and how to implement parallax to simulate three dimensions.
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Articles 02 Oct 2012
HTML5 2D game development: Introducing Snail Bait
In this series, HTML5 maven David Geary shows you how to implement an HTML5 2D video game one step at a time. This initial installment shows you the finished game and then gets you started implementing it from scratch. If you've ever wanted to create an HTML5 game but didn't have time to master all the details, this is the series for you.
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Articles 28 Aug 2012
Tip: Online migration of a file system to a smaller physical volume
Reducing a file system to reclaim unused space is easy enough to do online in IBM AIX. The unused space can then be allocated to other file systems in the volume group. However, if you want to reduce the size of a physical volume, for example, shrink a SAN LUN, you might damage the data on the AIX physical volume. The solution is to create a new, smaller physical volume, add it to the volume group, and then migrate the original file system using the standard Logical Volume Manager (LVM) utilities, such as mklvcopy or migratepv. After the original physical volume has been removed from the volume group, it can be unmapped and recycled for use somewhere else in the SAN.
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Articles 14 Aug 2012
Create rich-layout publications in EPUB 3 with HTML5, CSS3, and MathML
EPUB 3.0, which is the latest revision of the industry-standard XML e-book format, jumps into modern web technology by embracing HTML5 and CSS3. It retains its focus on XML-driven toolkits by requiring XHTML serialization and adding supplementary XML vocabularies, such as MathML and SVG. EPUB 3 offers a variety of options for developing advanced, digital-native publications. In this article, learn to create rich-layout pages using some new features in EPUB 3.
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Articles 05 Jul 2012
Use Drools and JPA for continuous, real-time data profiling
Use what you know about JPA and Drools 5 and learn even more while implementing a continuous, real-time data profiling application.
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Articles 05 Jul 2012
Consider the Apache Cassandra database
NoSQL storage provides a flexible and scalable alternative to relational databases, and among many such storages, Cassandra is one of the popular choices. Move beyond the well-known details and explore the less obvious details associated with Cassandra. You'll examine the Cassandra data model, storage schema design, architecture, and potential surprises associated with Cassandra.
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Articles 03 Jul 2012
Create a working compiler with the LLVM framework, Part 1
The LLVM compiler infrastructure provides a powerful way to optimize your applications regardless of the programming language you use. Learn the basics of the LLVM in this first article of a two-part series. Building a custom compiler just got easier!
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Articles 19 Jun 2012
Practice: Process logs with Apache Hadoop
Logs are an essential part of any computing system, supporting capabilities from audits to error management. As logs grow and the number of log sources increases (such as in cloud environments), a scalable system is necessary to efficiently process logs. This practice session explores processing logs with Apache Hadoop from a typical Linux system.
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Articles 30 May 2012
Using XPath with PHP
If your PHP applications perform beyond CRUD operations, chances are you have worked with XML. Navigating an XML document or data stream for the desired data elements can be cumbersome, though, and even somewhat intimidating for PHP developers. It can be especially overwhelming when the XML data structure is complex. XPath is a W3C standard whose sole purpose is just that -- getting to the right data element, or, specifically, the desired node. PHP supports XPath as part of its XML classes and functions. In this article you explore some basic scenarios for locating information in XML and how XPath can do the hard work for you in your PHP applications.
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Articles 17 May 2012
Use of IPSEC in Linux when configuring network-to-network and point-to-point VPN connections
This article takes a detailed look at the design principles, the basis for deploying VPN, and the IPSEC protocol concept, providing a description of the general features of IPSEC and of the mechanisms required for its implementation. This article was specially selected for translation by developerWorks Russia as an example of developerWorks world-wide offerings.
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Articles 15 May 2012
Social networks meet open-source project hosting
The revolutionary effects of social networks have not missed the world of software development. Many services emerged to support collaboration on projects over the Internet, especially in the world of open-source software. Concepts such as distributed version control, routine forking, and pull requests are in some ways changing the basic process of group development. One of the most popular social networks for software collaboration is GitHub, whose motto is "Social Coding." Learn about development social networks in the context of GitHub, but with principles applicable to other sites such as BitBucket, and even to your organization's internal systems.
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Articles 08 May 2012
Enable multiuser logins with VNC
Virtual Network Computing (VNC) is a popular tool for providing remote access to computers. The usual VNC configuration is optimized for single-user workstations, and logging in to the VNC port directly accesses a single user's desktop. This configuration is awkward on multiuser computers, however. Fortunately, you have an alternative. By linking VNC to a Linux computer's normal X Display Manager Control Protocol (XDMCP) server, accessing the VNC port enables users to provide their user names and passwords, thereby enabling a single VNC server instance to handle multiple user logins.
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Articles 24 Apr 2012
Create and parse XML on the Android 3.0 platform
Android, the most commonly used smartphone platform, also functions on mobile tablets. XML is the standard medium of data exchange. You can use the same builder, parser, and transformer APIs for standard XML parsing and transformation and for Android. In this article, create and parse an XML document on an Android device using a DocumentBuilder object obtained from a DocumentBuilderFactory. You'll parse the XML document using an extension of an XML pull parser.
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Articles 10 Apr 2012
Implement strong WiFi encryption the easy way with hostapd
Keep wireless security simple. hostapd, the Host Access Point daemon provides solid WiFi encryption that meets enterprise standards without all the overhead of running FreeRADIUS. Learn more about this tool and how to incorporate it into your environment.
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Articles 10 Apr 2012
From Java code to Java heap
This article gives you insight into the memory usage of Java code, covering the memory overhead of putting an int value into an Integer object, the cost of object delegation, and the memory efficiency of the different collection types. You'll learn how to determine where inefficiencies occur in your application and how to choose the right collections to improve your code.
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Articles 29 Feb 2012
Process your data with Apache Pig
Apache Pig is a high-level procedural language for querying large semi-structured data sets using Hadoop and the MapReduce Platform. Pig simplifies the use of Hadoop by allowing SQL-like queries to a distributed dataset. Explore the language behind Pig and discover its use in a simple Hadoop cluster.
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Articles 28 Feb 2012
Create a custom web services project in Drupal 7
Did you know you can provide web services through your Drupal- powered site? Learn how to use this technique to offer more flexibility with your content.
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Articles 31 Jan 2012
Store datasets directly in shared memory with PHP
Learn about shared memory and how to use it in web applications as a data storage option, benefiting from high speed, reliability, and data exchange with other applications. Provided examples show how it may help solve common problems in web application development.
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Articles 17 Jan 2012
Easy and beautiful documentation with Sphinx
Create maintainable, style-driven documents that can be automatically distributed in different formats using Sphinx. Discover how Sphinx abstracts the tedious parts and offers automatic functions to solve common problems like title indexing and special code highlighting.
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Articles 29 Nov 2011
Better MySQL searches with Sphinx
Even though MySQL is a good general-purpose database, if your application is search-heavy, you may get better performance by using Sphinx instead. Despite Sphinx being a full-text search tool, it can increase the speed of your application even when working with non-full-text queries. This article shows how to configure Sphinx for this task, includes some example queries, measures their execution times, and demonstrates some of the trade-offs involved in the change considering what you need to use Sphinx in a general, systematic way.
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Articles 08 Nov 2011
Build mobile text messaging into your web apps
Mobile messaging, and Short Message Service (SMS) in particular, is a crucial communication channel for reaching out to your users. Messaging is also a central part of the consumer mobile experience. However, implementing mobile messaging applications is difficult and expensive due to barriers involved with interacting with closed telco services. This article reviews the background and challenges of mobile messaging, and discusses several technical approaches to address these challenges. After reading this article, you will be ready to incorporate interactive text messaging into your own applications.
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Articles 02 Nov 2011
Using AutoCAD file formats with open source libraries
Many experts use AutoCAD in engineering, design, architecture, geography, and related fields. Combining AutoCAD data with GIS data, such as shapefiles, to use on maps is often useful. Learn about LibreDWG and dxflib, two open source libraries, that make the AutoCAD DXF and DWG file formats more accessible. Create a translator tool that writes to KML and shapefile formats and use the GDAL library to facilitate working with GML and shapefile formats.
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Articles 30 Aug 2011
Create GPS-enabling web applications
This article walks you through building the back end and front end of a GPS-enabled web application using PHP.
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Articles 02 Aug 2011
Explore practical data mining and parsing with PHP
The art of data mining is a wide field, and mentioning the term to two different developers gives you two very different ideas about it. In this article, you learn what data mining is, its importance, different ways to accomplish data mining (or to create web-based data mining tools) and develop an understanding of XML structure to parse XML and other data in PHP technology.
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Articles 26 Jul 2011
Debugging formats DWARF and STAB
Learn more about STAB and DWARF, two popular debugging formats. Find out how to debug and dissect UNIX executables constituting the DWARF and STAB formats. This material is of particular interest to programmers working on compilers and debuggers and anyone interested in reading or writing DWARF and STAB information.
Also available in: Japanese  
Articles 25 Jul 2011
Open source physics engines
A physics engine is a software component that provides a simulation of a physical system. This simulation can include soft- and rigid-body dynamics, fluid dynamics, and collision detection. This article introduces the use and basics of a physics engine and explores two options that exist: Box2D and Bullet.
Articles 07 Jul 2011
Build PDF files dynamically with PHP
Walk through the entire process of building PDF files dynamically using PHP. Experiment with open source tools, such as the Free PDF library (FPDF) or PDFLib-Lite, and PHP code for control of the PDF format of your content.
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Articles 28 Jun 2011
Starting to use ODBC with PHP
Learn how to set up and use the universal database connection technique known as Open Database Connectivity in conjunction with the Web development language PHP. This is an introductory article for the technologies required to make an open, reliable, and standardized Web application -- namely, PHP, ODBC, and SQL.
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Articles 24 May 2011
Hook into Wikipedia information using PHP and the MediaWiki API
Wikipedia is the ultimate online encyclopedia, containing millions of entries on different aspects of human knowledge. Web application developers are able to access and search these entries through the Wikipedia API. This article introduces the Wikipedia API and demonstrates it in the context of a PHP application, explaining how to search and retrieve different elements of Wikipedia content with PHP.
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Articles 17 May 2011
Introduction to programming in Erlang, Part 1: The basics
Erlang is a multi-purpose programming language used primarily for developing concurrent and distributed systems. Released as open source in 1998, Erlang has become more popular in recent years thanks to its use in high profile projects, such as the Facebook chat system, and in innovative open source projects, such as the CouchDB document-oriented database management system. In this article, you will learn about Erlang, and how its functional programming style compares with other programming paradigms such as imperative, procedural and object-oriented programming.
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Articles 10 May 2011
Combine advanced spreadsheet export with PHP to create pivot tables
Add PHP to an advanced export function in Microsoft Excel to create a flexible pivot table in XML format. Then, you and users can sort and analyze the data in the pivot table on the fly.
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Articles 12 Apr 2011
Use Python to write plug-ins for GIMP
GNU Image Manipulation Program (GIMP) provides a strong, open-source alternative for doing detailed graphical work such as photo editing, making it a good replacement for commercial software. However, GIMP's API offers developers a number of ways to customize and even embed its functionality to fit specific needs. Learn more about GIMP scripting with Python and see how you can put it to work for you.
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Articles 29 Mar 2011
High-performance XML parsing in Python with lxml
lxml is a fast yet flexible library for XML processing in Python. It comes bundled with support for XML Path Language (XPath) and Extensible Stylesheet Language Transformation (XSLT), and it implements the familiar ElementTree API. In this article, you focus both on the ease of use provided by lxml and on its high-performance profile when processing very large XML data.
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Articles 24 Mar 2011
Build an easy JavaScript data access layer
Work through the entire process of building a database access wrapper in PHP for the back end and connecting it to a JavaScript access wrapper at the user interface layer in this article.
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Articles 15 Mar 2011
Debugging from dumps
Memory Analyzer is a powerful tool for diagnosing memory leaks and footprint problems from the dump of a Java process. It can also give you detailed insight into your Java code and enable you to debug some tricky problems from just one dump, without needing to insert diagnostic code. In this article, you'll learn how to generate dumps and use them to examine the state of your application.
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Articles 15 Mar 2011
Custom AST transformations with Project Lombok
Alex Ruiz introduces Project Lombok in this article, discussing some of the programming sugar that makes it unique, including annotation-driven code generation and clean, compact, and readable code. He then draws your attention to one of the more rewarding uses of Lombok: extending it with custom AST (Abstract Syntax Tree) transformations. Extending Lombok will enable you to generate your own project- or domain-specific boilerplate code, but it does require a fair amount of work. Alex concludes with his tips for easing through key stages of the process, along with a freely usable custom extension for JavaBeans.
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Articles 01 Mar 2011
An introduction to the Hadoop Distributed File System
The Hadoop Distributed File System (HDFS)--a subproject of the Apache Hadoop project--is a distributed, highly fault-tolerant file system designed to run on low-cost commodity hardware. HDFS provides high-throughput access to application data and is suitable for applications with large data sets. This article explores the primary features of HDFS and provides a high-level view of the HDFS architecture.
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Articles 01 Feb 2011
Domain-model persistence with Morphia and MongoDB
Morphia is a type-safe, object-mapping library for MongoDB, an open source document-oriented database. This article explains the benefits of mapping documents to and from objects and shows how to use Morphia for this purpose. Then it demonstrates how to persist, load, delete, and query a Java domain model mapped to MongoDB.
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Articles 25 Jan 2011
Technical standards in education, Part 4: Interoperable resource deposit using SWORD
Open repositories allow cutting edge research to reach wider audiences. The Simple Web-service Offering Repository Deposit (SWORD) protocol is the standard by which most open repositories allow remote deposit. This article describes the SWORD protocol, why it was developed, possible use cases, and how it works.
Articles 25 Jan 2011
Understanding the Zend Framework, Part 5: Creating PDF files
In previous parts of this "Understanding the Zend Framework" series, you created the basic application, the Chomp online feed reader, using the open source PHP Zend Framework. In this tutorial, you use the Zend Framework's PDF capabilities to generate a PDF document based on entries the user has saved.
Tutorial 18 Jan 2011
Java web services: The state of web service security
WS-Security and related standards provide a wide range of options for web service security. Of this wide range, web services stacks test only a limited number of security configurations, and even fewer configurations for interoperability, on their own. Find out what the industry has done to promote interoperability among web services stacks, and read a summary comparison of how the three main open source Java stacks handle security.
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Articles 07 Dec 2010
Taking medical records into the digital age
Traditional medical record systems are failing to keep up with the increasing demands in healthcare. In this article, we explore the current challenges with traditional, paper-based medical record systems. Using OpenEMR as an example, you will see how modern Electronic Medical Record (EMR) systems fix the problems.
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Articles 30 Nov 2010
Java web services: Understanding WS-Policy
WS-Policy provides a general structure for configuring features and options that apply to a web service. You've seen it used for WS-Security configurations in this series, and perhaps elsewhere for other extension technologies such as WS-ReliableMessaging. In this article, you'll learn about the structure of WS-Policy documents and the ways you can attach policies to services in Web Service Description Language (WSDL), with security-configuration examples tried on Apache Axis2, Metro, and Apache CXF.
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Articles 02 Nov 2010
What is PMML?
The Predictive Model Markup Language (PMML) is the de facto standard language used to represent predictive analytic models. It allows for predictive solutions to be easily shared between PMML compliant applications. With predictive analytics, the Petroleum and Chemical industries create solutions to predict machinery break-down and ensure safety. PMML is supported by many of the top statistical tools. As a result, the process of putting a predictive analytics model to work is straightforward since you can build it in one tool and instantly deploy it in another. In a world in which sensors and data gathering are becoming more and more pervasive, predictive analytics and standards such as PMML make it possible for people to benefit from smart solutions that will truly revolutionize their lives.
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Articles 28 Sep 2010
Create PDFs on the fly using TCPDF
TCPDF is a popular open source PHP library that lets you create PDF documents. Its flexibility and versatility lets you create even complex color documents featuring whatever fonts and graphics you need. TCPDF is written entirely in PHP and does all of this PDF magic without requiring any external libraries. This article introduces you to TCPDF, then walks you through reproducing a simple HTML invoice in a downloadable PDF file.
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Articles 10 Aug 2010
Java web services: WS-Security without client certificates
WS-Security symmetric encryption lets you secure message exchanges between client and server without requiring client certificates, simplifying your web service configuration while also providing performance benefits. You can use it directly or in the bootstrap for WS-SecureConversation exchanges. In this article, you'll learn how to configure and use symmetric encryption with the three main open source Java web services stacks: Axis2, Metro, and CXF. You'll also see how plain WS-Security symmetric encryption performance compares to WS-SecureConversation performance.
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Articles 03 Aug 2010
Applying memcached to increase site performance
The open source memcached tool is a cache for storing frequently used information to save you from loading (and processing) information from slower sources, such as disks or a database. It can be deployed in either a dedicated situation, or as a method of using up spare memory in an existing environment. Despite the simplicity of memcached, it is sometimes used incorrectly, or it is used as a solution in the wrong type of environment. Learn when it is best to take advantage of using memcached.
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Articles 03 Aug 2010
Build a web-based notification tool with XMPP
Real-time web applications are networked applications, with web-based user interfaces, that display Internet information as soon as it's published. Examples include social news aggregators and monitoring tools that continually update themselves with data from an external source. In this tutorial, you will create Pingstream, a small notification tool that uses PHP and JavaScript to communicate over the Extensible Messaging and Presence Protocol (XMPP), a set of XML technologies designed to support presence and real-time-communications functionality.
Also available in: Chinese  
Tutorial 22 Jun 2010
Understanding information content with Apache Tika
With the increasingly widespread use of computers and the pervasiveness the modern Internet has attained, huge amounts of information in many languages are becoming available. Automatic information processing and retrieval is urgently needed to understand content across cultures, languages, and continents. A recent Apache software project, Tika, is becoming an important tool toward realizing content understanding.
Tutorial 15 Jun 2010
Data mining with WEKA, Part 3: Nearest Neighbor and server-side library
Data mining can be used to turn seemingly meaningless data into useful information, with rules, trends, and inferences that can be used to improve your business and revenue. This article will go over the last common data mining technique, "Nearest Neighbor," and will show you how to use the WEKA Java library in your server-side code to integrate data mining technology into your Web applications.
Also available in: Russian  
Articles 08 Jun 2010
Java web services: CXF performance comparison
Apache CXF shares certain underlying components with both Apache Axis2 and Metro but combines the components within an entirely different architecture. Dennis Sosnoski continues his Java web services column series by comparing how the CXF, Metro, and Axis2 stacks perform both with and without WS-Security.
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Articles 27 Apr 2010
Ajax and Smarty, Part 1: Develop Ajax applications with Smarty
Smarty is a PHP template engine that lets you separate the business logic from the presentation in your Web applications. Smarty currently has no built-in Asynchronous JavaScript and XML (Ajax) support, but its plug-in architecture lets you extend it easily and use it together with JavaScript frameworks, such as jQuery. This series describes how to use Smarty in Ajax applications, how to create Smarty plug-ins, and how to improve the code quality of your Web applications, making the code more readable and easier to maintain.
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Articles 27 Apr 2010
Cloud computing with PHP, Part 3: Using Amazon SQS with the Zend Framework
The Zend Framework contains several classes that make using cloud-based services easy. Part 1 of this "Cloud computing with PHP" series looks at using Zend classes with Amazon's S3 cloud storage service. Part 2 covers the Zend classes that make it easy to work with virtual machines in Amazon's Elastic Compute Cloud (EC2). This article focuses on the Zend classes for working with Amazon's Simple Queue Service (SQS).
Articles 30 Mar 2010
Java web services: WS-Security with CXF
The Apache CXF web services stack supports WS-Security, including using WS-SecurityPolicy to configure the security handling. CXF is flexible in how you configure the deployment parameters used at run time to implement the security handling, supporting both static and dynamic configuration options for the client side. In this article, Java web services series author Dennis Sosnoski shows how to use CXF for both a simple UsernameToken WS-Security example and one using signing and encryption.
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Articles 23 Mar 2010
CouchDB basics for PHP developers
Author Thomas Myer shows experienced PHP developers how to add CouchDB to their technical toolboxes.
Also available in: Japanese  
Articles 23 Mar 2010
Python basics for PHP developers
Are you an experienced PHP developer who needs to learn Python? This article approaches the world of Python development from a PHP developer's perspective, translating familiar PHP concepts, such as variables, lists, and functions, into their Python equivalents.
Also available in: Japanese  
Articles 09 Feb 2010
Java web services: Introducing CXF
The Apache CXF web services stack supports JAXB 2.x data binding (along with some alternative data bindings) and JAX-WS 2.x service configuration. Like the Metro JAXB/JAX-WS alternative discussed in earlier columns, CXF uses XML files to extend the JAX-WS configuration information. In this article, Java web services series author Dennis Sosnoski looks into the basics of working with CXF for client and server development.
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Articles 09 Feb 2010
Using QEMU for cross-platform development
One of Linux's strengths is its cross-platform nature: you can run it on x86, x86-64, SPARC, PowerPC, and many other central processing units (CPUs). This wealth of hardware choices poses a challenge for software developers, though. Ensuring that software compiles, and runs correctly, on all platforms can be difficult. The use of the QEMU package can help ease this burden. QEMU is a machine emulator that supports a wide range of CPUs, so you can run PowerPC software on an x86 computer, x86-64 software on an SPARC computer, or what have you. This facility is particularly useful for programmers who need to test software's endianness compatibility or check other CPU-specific features. QEMU also enables you to run different operating systems entirely, so that you can test a program's ability to compile and run under FreeBSD, Solaris, or even Microsoft Windows without shutting down Linux.
Also available in: Japanese  
Articles 09 Feb 2010
Developing dynamic Web sites with CodeIgniter
Learn how to quickly and efficiently code a dynamic Web site using CodeIgniter. By leveraging CodeIgniter’s framework and built-in shortcuts, you will write the necessary MVC files to create, read, update, and delete (CRUD) items to and from a database.
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Articles 12 Jan 2010
Using Simple for XML serialization
Java developers have a variety of choices when it comes to serializing and deserializing Extensible Markup Language (XML) objects. Simple is one such example, and it offers a number of advantages over its competitors. In this article, explore an introductory overview of how to use Simple within an XML communication system.
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Articles 24 Nov 2009
Total security in a PostgreSQL database
Database security is the single biggest concern with today's Web-based applications. Without control, you risk exposing sensitive information about your company or, worse yet, your valuable customers. In this article, learn about security measures you can take to protect your PostgreSQL database.
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Articles 17 Nov 2009
Validating XML in PHP
PHP developers commonly require the services of an Extensible Markup Language (XML) parser in their code. Along these lines, they frequently find it necessary to validate XML input. Fortunately, you can easily accomplish this in PHP. This article shows you how to validate XML documents within PHP and determine the cause of validation failures.
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Articles 10 Nov 2009
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