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Get started with the Java EE 8 Security API, Part 3: Securely access user credentials with IdentityStore
Learn how to use the new IdentityStore interface to setup and configure RDBMS or LDAP identity storage in your Java web applications.
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Articles 12 Apr 2018
Get started with the Java EE 8 Security API, Part 4: Interrogating caller data with SecurityContext
This final article in the Java EE Security API series introduces the SecurityContext API, which is used to interrogate caller data consistently across servlet and EJB containers. Find out how SecurityContext extends HttpAuthenticationMechanism's declarative capabilities, then put it to work testing caller data in a servlet container example.
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Articles 12 Apr 2018
Get started with the Java EE 8 Security API, Part 2: Web authentication with HttpAuthenticationMechanism
HttpAuthenticationMechanism’s annotation-driven approach is a welcome departure from the tedium of manually configuring authentication for Java web applications. Learn how to setup and configure both classic Servlet 4.0-style authentication and custom solutions using HttpAuthenticationMechanism and the new Java EE 8 Security API.
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Articles 09 Mar 2018
Get started with the Java EE 8 Security API, Part 1: Java enterprise security for cloud and microservices platforms
As one of the three core specifications introduced with Java EE 8, the new Java EE Security API is an essential addition to your Java EE toolkit, and thankfully not terribly difficult to learn. Find out how the Java EE Security API supports enterprise security in cloud and microservices platforms, while introducing modern capabilities such as context and dependency injection.
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Articles 10 Feb 2018
Making the cut: Top Java content from developerWorks
A quick rundown of the top content published in the Java hub in 2017.
Also available in: Chinese  
Articles 15 Jan 2018
Create an artificial neural network using the Neuroph Java framework
Build an artificial neural network (ANN) using the Java language and Neuroph open source framework.
Also available in: Chinese  
Articles 08 Jan 2018
Sample code: Analyze text with the Watson Personality Insights service
This code shows you how to use the node.js API for the Watson Personality Insights service. Given some text, Watson analyzes the openness, conscientiousness, extraversion, agreeableness, emotional range, and needs of the speaker.
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Articles 18 Aug 2017
Sample code: Translate natural language with the Watson Language Translator service
This code shows you how to use the Java API for the Watson language translator service. Given some text, a source language, and a target language, Watson translates that text and returns one or more translations to you.
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Articles 18 Aug 2017
Sample code: Identify the tone of written text with the Watson Tone Analyzer service
This code shows you how to use the node.js API for the Watson Tone Analyzer service. Given some text, Watson evaluates the tone, looking for qualities such as the speaker's levels of anger, disgust, joy, fear, and sadness.
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Articles 18 Aug 2017
Sample code: Recognize and identify faces in an image with the Watson Visual Recognition service
This code shows you how to use the node.js API for the Watson Visual Recognition service. Given an image, Watson looks for faces in that image and attempts to recognize each of those faces.
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Articles 17 Aug 2017
Sample code: Translate natural language with the Watson Language Translator service
This code shows you how to use the node.js API for the Watson Language Translator service. Given some text, a source language, and a target language, Watson translates that text and returns one or more translations to you.
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Articles 18 Jul 2017
Sample code: Identify the context of natural language with the Watson Natural Language Classifier service
This code shows you how to use the Java API for the Watson natural language classification service. Given some text and a context, Watson analyzes the text and returns a list of categories relevant to that text.
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Articles 18 Jul 2017
Sample code: Identify the context of natural language with the Watson Natural Language Classifier service
This code shows you how to use the node.js API for the Watson natural language classification service. Given some text and a context, Watson analyzes the text and returns a list of categories relevant to that text.
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Articles 18 Jul 2017
Sample code: Analyze text with the Watson Personality Insights service
This code shows you how to use the Java API for the Watson Personality Insights service. Given some text, Watson analyzes the openness, conscientiousness, extraversion, agreeableness, emotional range, and needs of the speaker.
Also available in: Chinese  
Articles 18 Jul 2017
Sample code: Identify the tone of written text with the Watson Tone Analysis service
This code shows you how to use the Java API for the Watson tone analysis service. Given some text, Watson evaluates the tone, looking for qualities such as the speaker's levels of anger, disgust, joy, fear, and sadness.
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Articles 18 Jul 2017
Sample code: Identify objects in an image with the Watson Visual Recognition service
This code shows you how to use the node.js API for the Watson Visual Recognition service. Given an image, Watson attempts to identify objects in that image.
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Articles 18 Jul 2017
5 things you didn't know about ...: Multithreaded Java programming
Multithreaded programming is never easy, but it does help to understand how the JVM processes subtly different code constructs. Steven Haines shares five tips that will help you make more informed decisions when working with synchronized methods, volatile variables, and atomic classes.
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Articles 17 May 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
5 things you didn't know about ...: Java performance monitoring, Part 2
If it's news to you that the JDK ships with the full-featured profiler JConsole, you'll be even more surprised to learn about the five stand-alone profiling utilities introduced in this article. Find out how lightweight (and in some cases experimental) Java process monitoring and analysis tools can help you hone in on performance bottlenecks like thread starvation, deadlocks, and object leaks.
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Articles 17 May 2017
5 things you didn't know about ...: Java performance monitoring, Part 1
Blaming bad code (or bad code monkeys) won't help you find performance bottlenecks and improve the speed of your Java applications, and neither will guessing. Ted Neward directs your attention to tools for Java performance monitoring, starting with five tips for using Java's built-in profiler, JConsole, to collect and analyze performance data.
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Articles 17 May 2017
5 things you didn't know about ...: JARs
Many Java developers never think beyond the basics of JARs -- only using them to bundle classes before shipping them off to the production servers. But a JAR is more than just a renamed ZIP file. Learn how to use Java Archive files at their fullest capacity, including tips for jarring Spring dependencies and configuration files.
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Articles 17 May 2017
5 things you didn't know about ...: java.util.concurrent, Part 2
In addition to concurrency-friendly Collections, java.util.concurrent introduced other pre-built components that can assist you in regulating and executing threads in multithreaded applications. Ted Neward introduces five more of his Java programming must-haves from the java.util.concurrent package.
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Articles 17 May 2017
5 things you didn't know about ...: java.util.concurrent, Part 1
Writing multithreaded code that both performs well and protects applications against corruption is just plain hard -- which is why we have java.util.concurrent. Ted Neward shows you how concurrent Collections classes like CopyOnWriteArrayList, BlockingQueue, and ConcurrentMap retrofit standard Collections classes for your concurrency programming needs.>
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Articles 17 May 2017
5 things you didn't know about ...: The Java 6 Collections API, Part 1
The Java 6 Collections API is far more than a replacement for arrays, though that's not a bad place to start. Ted Neward dispenses five tips for doing more with Collections, including a primer on customizing and extending the Java Collections API.
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Articles 17 May 2017
Protect your apps from cross-site scripting (XSS) attacks
One of the most common techniques for cross-site scripting attacks is injecting code into a web page. This code snippet shows you how to use escape sequences so that any injected code can't run.
Also available in: Chinese  
Articles 14 Apr 2017
Blockchain chaincode for Java developers
Blockchain is changing the way business transactions are done on the Internet. In this tutorial, you'll install a blockchain network and run a chaincode smart contract written in the Java language.
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Tutorial 30 Mar 2017
Notes from the developerWorks Technology editor: The best of 2016
Review the top content published in the Java development and Web development hubs in 2016.
Articles 04 Jan 2017
Intro to Java programming
Learn the structure, syntax, and programming paradigm of the Java platform and language. Start by mastering the essentials of object-oriented programming on the Java platform, and progress incrementally to the more-sophisticated syntax and libraries that you need in order to develop complex, real-world Java applications.
Also available in: Chinese  
Tutorial 14 Sep 2016
Achieve your API strategy with IBM API Connect
To deliver on your API strategy, you need to understand your key stakeholders, their needs, and how API Connect can help to meet those needs. In this article you learn about these essential elements of an API strategy. You see how IBM API Connect goes beyond the limits of an API management platform, allowing your organization to not only manage and secure its APIs, but to also create and run them. Finally, you see how quickly you can get started with API Connect.
Articles 06 Jun 2016
Docker: A boon for the modern developer
Use Docker to code more productively and expand your skills more efficiently. Declutter your development environment, eliminate dependency conflicts, and reduce development and learning time by working with containerized applications.
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Articles 05 Jan 2016
Using Spark Streaming for keyword detection
As new kinds of devices connect to the internet, they generate petabytes of data every day. Companies analyze this valuable data to better understand and meet their customers’ needs. Streaming big data analytics gives users the ability to analyze data in real time, which is useful in time-critical applications like fraud detection. In this article, learn how to use the Spark Streaming platform for real-time keyword detection.
Also available in: Chinese  
Articles 26 Nov 2015
Notes from developerWorks Technology: Top Java tutorials from 2015
The developerWorks Technologies editor showcases the top tutorials published in 2015 for Java developers.
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Articles 17 Nov 2015
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
Develop full-stack Java apps with Vaadin in the cloud
Use the Vaadin Rich Web Starter boilerplate to deploy a customized DB2-backed, three-tier order-desk web app to the Bluemix cloud in minutes.
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Articles 30 Sep 2015
Full-stack Java web dev with Vaadin
Java web developers are often forced to learn JavaScript, CSS, and HTML5 (cornerstone of all modern browsers) in order to create compelling interactive user experiences for their web applications. Vaadin open source framework empowers Java developers by giving them full-stack control within a 100% Java world.
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Articles 30 Sep 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
Introduction to Java multitenancy
The multitenant JVM recently became available as part of the IBM SDK Java Technology Edition, Version 7 Release 1 as a tech preview. By running multiple applications within a single multitenant JVM, a cloud system can speed applications' start times and reduce their memory footprint. This article introduces the technology behind multitenant cloud JVM and discusses the main costs and benefits.
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Articles 06 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
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
Rapidly build a rich three-tier web app, Part 2: Build the application tier
In this three-part tutorial, learn how to use IBM Rational Application Developer and IBM Bluemix to rapidly build and host a multi-tier Java Enterprise Edition (JEE) app. Find out how you can save time in each stage: creating the data model and database, generating the data access code using the Java Persistence API (JPA), writing the Enterprise JavaBeans (EJBs) and web services, and using Dojo to create a rich web UI for viewing and modifying the data. When the application is complete, you'll deploy it to IBM Bluemix, the IBM Platform as a Service (PaaS).
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Articles 10 Mar 2015
Rapidly build a rich three-tier web app, Part 1: Build the database
In this three-part tutorial, learn how to use IBM Rational Application Developer and IBM Bluemix to rapidly build and host a multi-tier Java Enterprise Edition (JEE) app. Find out how you can save time in each stage: creating the data model and database, generating the data access code using the Java Persistence API (JPA), writing the Enterprise JavaBeans (EJBs) and web services, and using Dojo to create a rich web UI for viewing and modifying the data. When the application is complete, you'll deploy it to IBM Bluemix, the IBM Platform as a Service (PaaS).
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Articles 10 Mar 2015
Integrating FindBugs, CheckStyle and Cobertura with Rational Team Concert build system
This article discusses the integration of quality assurance tools FindBugs, CheckStyle and Cobertura with IBM Rational Team Concert. This integration reduces defect generation when compiling and building an application. It improves the code quality of the application while performing the day-to-day build job. This technique can be used cross-platform with products and applications built on Java technology.
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Articles 22 Jan 2015
OAuth 2.0 clients in Java programming, Part 3: Authorization code grant
This multi-part series will help you develop a generic and reusable OAuth 2.0 client that can be used to interface with any OAuth 2.0-compliant server. Part 1 explained how to implement the resource owner password credentials grant. Part 2 described how to implement the client credentials grant. Now, Part 3 teaches you how to implement the authorization code grant.
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Tutorial 04 Nov 2014
OAuth 2.0 clients in Java programming, Part 2: Client credentials grant
This multi-part series will help you develop a generic and reusable OAuth 2.0 client that can be used to interface with any OAuth 2.0-compliant server. Part 1 explained how to implement the resource owner password credentials grant. Now, Part 2 describes how to implement the client credentials grant.
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Tutorial 28 Oct 2014
IBM@JavaOne 2014: Developers first
As a longtime licensee of the Java platform, IBM is a regular supporter and active participant in the annual JavaOne conference. This article provides an overview of IBM's activities -- keynotes, technical presentations, demos, and after-hours entertainment -- during JavaOne 2014.
Also available in: Russian  
Articles 24 Sep 2014
Going to JavaOne? Take a Break!
If you find yourself looking for a little downtime from all the excitement at JavaOne 2014, look no further. This article sends you in the right direction to rest, refresh, and recharge.
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Articles 24 Sep 2014
Build a Hangman game with Java, Ajax, and Cloudant
Learn how to build an online Hangman game by using the Bluemix Liberty for Java runtime and Cloudant NoSQL database service.
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Tutorial 04 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
Improving performance and scalability for IBM Sterling Order Management
This article discusses the design best practices that are important for the performance and scalability of the IBM Sterling Order Management solution. Adopting these design best practices during implementation, helps eliminate the common performance bottlenecks that are introduced with custom design or code.
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Articles 07 Aug 2014
Java multitenancy: Configuration options, tenant lifecycle, and isolation in action
The multitenant JVM is available with the IBM SDK Java Technology Edition, Version 7 Release 1 as a tech preview. By running multiple applications within a single multitenant JVM, a cloud system can speed applications' start times and reduce their memory footprint. Examine the tenant lifecycle, learn some of the available configuration options, and see the benefits of isolation of statics in tenant applications. This article builds on a previous developerWorks article, "Introduction to Java multitenancy."
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Articles 31 Jul 2014
JVM concurrency: To block, or not to block?
The CompletableFuture class added in Java 8 gives you new ways to handle the completion of asynchronous processing, including nonblocking ways to compose and combine events. This article helps you understand the differences between blocking and nonblocking approaches to handling completions and gives you some reasons to prefer nonblocking approaches.
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Articles 22 Jul 2014
Java.next: Choosing your next JVM language
Any of the Java.next languages is a suitable candidate for your next language, so how do you choose? Investigate the factors that contribute to this important decision.
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Articles 13 May 2014
JVM concurrency: Java 8 concurrency basics
Java 8 incorporates new language features and added classes that give you easier ways to construct programs, including concurrent programs. Learn about new, powerful parallel-processing support in the language made possible by Java 8 extensions, including CompletableFuture and streams. You'll recognize similarities between these new features and some of the Scala capabilities that you explored in the first article of this series.
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Articles 08 Apr 2014
Java 8 language changes
Java 8 incorporates important new language features that give you easier ways to construct programs. Lamba expressions define a new syntax for inline code blocks that gives you the same flexibility as anonymous inner classes, with much less boilerplate. Interface changes make it possible to add to existing interfaces without breaking compatibility with existing code. Learn how these changes work together.
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Articles 08 Apr 2014
Generate DITA Java API reference documentation using DITADoclet and DITA API specialization
Combine DITADoclet and DITA API specialization to save time and still produce quality API documentation directly from the Java source code.
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Articles 17 Mar 2014
Transparent network acceleration for Java-based workloads in the cloud
Java Sockets over RDMA (JSOR) is a new communication library in the IBM Java 7 SDK for Linux platforms. JSOR can improve throughput and reduce latency for client-server applications in cloud environments by exploiting RDMA-capable high-speed network adapters. Learn about the technology underlying JSOR, find out how to use the library, and compare JSOR performance with solutions based on other communication protocols.
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Articles 28 Jan 2014
Getting started with Node.js
Learn what Node.js is and how to get started using it in this brief introduction.
Demos 02 Jan 2014
Eliminate banner grabbing in Apache Tomcat
Banner grabbing is often the first step before a full-blown cyber attack, but it's easy to prevent. Learn how to secure your Apache Tomcat installation against version-based exploits by overriding the default parameters in your Server.xml and ServerInfo.properties files.
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Articles 02 Dec 2013
Java.next: Currying and partial application
All of the Java.next languages include currying and partial application but implement them in different ways. This installment explains both techniques, distinguishes between them, and shows implementation details -- and practical uses -- in Scala, Groovy, and Clojure.
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Articles 26 Nov 2013
Developing mobile apps with Node.js and MongoDB, Part 1: A team's methods and results
Explore the advantages of using Node.js (server-side JavaScript) to develop systems of engagement. In this article, see the results achieved by an IBM Extreme Blue team who used Node and MongoDB with IBM Passes, an application that demonstrates the notion of systems of engagement. Their experience with Node and MongoDB provides interesting insight into how rapid application development can be achieved with these solutions that are starting to appear in the enterprise.
Also available in: Portuguese  
Articles 26 Nov 2013
Next-generation search and analytics with Apache Lucene and Solr 4
Apache Lucene and Solr are highly capable open source search technologies that make it easy for organizations to enhance data access dramatically. With the 4.x line of Lucene and Solr, it's easier than ever to add scalable search capabilities to your data-driven applications. Lucene and Solr committer Grant Ingersoll walks you through the latest Lucene and Solr features that relate to relevance, distributed search, and faceting. Learn how to leverage these capabilities to build fast, efficient, and scalable next-generation data-driven applications.
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Articles 28 Oct 2013
Verify and convert JSON payloads dynamically for cloud-based applications
This article presents a solution architecture that facilitates JavaScript Object Notation (JSON) validation and transformation for the benefit of cloud consumers and cloud service providers.
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Articles 02 Oct 2013
Java.next: Mixins and traits
The Java language's primary paradigm, object orientation with single inheritance, effectively models most but not all programming problems. The Java.next languages extend this paradigm in various ways, including mixins and traits. This Java.next installment defines the mechanisms that mixins and traits share, and it delves into the subtle differences between mixins in Groovy and traits in Scala.
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Articles 19 Sep 2013
IBM@JavaOne 2013: The IBM sessions
IBM is a regular supporter of the JavaOne conference, both as a sponsor and as a source of technical presenters. If you plan to attend JavaOne 2013, don't miss your opportunity to glean invaluable knowledge from IBM's Java experts and to learn about their vital contributions to the Java ecosystem. This article gives you an overview of the activities that the IBM team is involved in during the week of JavaOne in 2013.
Also available in: Chinese  
Articles 19 Sep 2013
Test cloud-based applications with Apache JMeter
JMeter is a powerful testing tool that you can use to test applications that run in the cloud. But managing and maintaining JMeter scripts can be challenging if you don't know how to use JMeter effectively. This article presents techniques that can help you implement well-designed, automated JMeter tasks in your cloud-based application testing.
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Articles 09 Sep 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
Prevent cross-site scripting attacks by encoding HTML responses
Uncover the basics of cross-site scripting attacks and learn how you can prevent them using a Java-based approach to encode HTML output from a server.
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Articles 30 Jul 2013
Java diagnostics, IBM style, Part 1: Introducing the IBM Diagnostic and Monitoring Tools for Java - Dump Analyzer
Java applications have become increasingly complex; as a result, diagnosing problems in these applications is a non-trivial task and may require extensive work with an external service organization. A helpful pointer in the right direction could save both time and expense. The IBM Diagnostic and Monitoring Tools for Java - Dump Analyzer is a tool that performs basic analysis against a formatted system dump and produces a concise report indicating what it thinks your next course of action should be.
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Articles 18 Jul 2013
Java diagnostics, IBM style, Part 2: Garbage collection with the IBM Monitoring and Diagnostic Tools for Java - Garbage Collection and Memory Visualizer
The IBM Monitoring and Diagnostic Tools for Java - Garbage Collection and Memory Visualizer, new tooling from IBM, is designed to help diagnose and analyze memory-related Java performance problems. This article, the second in a four-part series, explains how to obtain and use the toolkit and demonstrates how you can use it to quickly diagnose some common problems.
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Articles 18 Jul 2013
Faster problem solving in Java with heuristic search
Learn about the field of heuristic search and its application to artificial intelligence. This article's authors show how they arrived at a successful Java implementation of the most widely used heuristic search algorithm. Their solution exploits an alternative framework to Java Collections and uses best practices for avoiding excessive garbage collection.
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Articles 16 Jul 2013
DB2 JSON capabilities, Part 3: Writing applications with the Java API
DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or IBM DB2 for z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of a RDBMS with well-known enterprise features and quality of service. This DB2 NoSQL capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. The DB2 JSON Java API is the backbone of the command-line processor and the wire listener, and supports writing custom applications. The article introduces basic methods with a sample Java program and discusses options to optimize storing and querying JSON documents.
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Articles 03 Jul 2013
DB2 JSON capabilities, Part 4: Using the IBM NoSQL Wire Listener for DB2
DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or IBM DB2 on z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of a RDBMS with well-known enterprise features and quality of service. This DB2 NoSQL capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. In this article, the IBM NoSQL Wire Listener for DB2 is introduced. It parses messages based on the MongoDB wire protocol. It thus enables using MongoDB community drivers, and the skills acquired when working with these drivers, to store, update and query JSON documents with DB2 as JSON store.
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Articles 27 Jun 2013
HTML5 2D game development: Implement gravity and add sound
In this series, HTML5 maven David Geary shows you how to implement an HTML5 2D video game one step at a time. In this installment, you'll complete Snail Bait's mechanics by learning how to incorporate gravity when the runner falls. Then, you'll see how to implement sound -- both a musical soundtrack and sound effects.
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Articles 21 Jun 2013
DB2 JSON capabilities, Part 2: Using the command-line processor
Rapidly changing application environments require a flexible mechanism to store and communicate data between different application tiers. JSON (Java Script Object Notation) has proven to be a key technology for mobile, interactive applications by reducing overhead for schema designs and eliminating the need for data transformations. DB2 JSON enables developers to write applications using a popular JSON-oriented query language created by MongoDB to interact with data stored in IBM DB2 for Linux, UNIX, and Windows or IBM DB2 for z/OS. This driver-based solution embraces the flexibility of the JSON data representation within the context of a RDBMS, which provides established enterprise features and quality of service. This DB2 NoSQL capability supports a command-line processor, a Java API, and a wire listener to work with JSON documents. In this article, you will set up a DB2 database to support NoSQL applications and walk through a scenario that introduces basic features of the DB2 JSON command-line processor to help you get started with your own applications.
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Articles 20 Jun 2013
Java.next: Extension without inheritance, Part 1
Groovy, Scala, and Clojure offer many extension mechanisms, whereas inheritance is virtually the Java language's only option. This installment looks at category classes, the ExpandoMetaClass, implicit casts, and protocols as ways to extend Java classes with the Java.next languages.
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Articles 12 Jun 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
Java.next: The Java.next languages
This article launches a new developerWorks series by Neal Ford that performs a deep comparison of three next-generation JVM languages: Groovy, Scala, and Clojure. In this initial installment, find out what you'll gain from understanding their similarities and differences -- whether or not you choose to keep using Java as your main programming language for now.
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Articles 14 May 2013
HTML5 2D game development: Collision detection and sprite animations
In this series, HTML5 maven David Geary shows you how to implement an HTML5 2D video game one step at a time. In this installment, learn how Snail Bait implements collision detection and explosions.
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Articles 16 Apr 2013
Working with jQuery UI themes
The jQuery UI is now the industry standard for theme implementation because of its support for widgets. Dive into the jQuery UI platform with Java architect Ken Ramirez to learn how to use jQuery UI's native themes and design custom themes for your site.
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Articles 04 Apr 2013
Process real-time big data with Twitter Storm
Storm is an open source, big-data processing system that differs from other systems in that it's intended for distributed real-time processing and is language independent. Learn about Twitter Storm, its architecture, and the spectrum of batch and stream processing solutions.
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Articles 02 Apr 2013
Monitor a Java application with the Health Center API, Part 1
The 2.1 release of Health Center contains a powerful API. The API allows Java developers to embed Health Center in their applications and harness its monitoring power to troubleshoot problems. In Part 1 of this two-part article, you learn to use the Health Center API and to monitor for deadlocks in a running Java application. Part 2 uses the deadlock detection application that is developed in this article and adds a method-profiling view to show where the application spends most of its CPU cycles.
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Articles 26 Feb 2013
Test automation and continuous integration with STAF/STAX
Regression and incremental tests play an important role during the testing of an application that might comprise hundreds or thousands of requirements. While the execution of incremental tests can sometimes be run manually, regression tests require an automation tool or framework. The support for multiple operating systems, architectures, and middleware software, like application servers and databases, make the necessity of an automation framework even more urgent. This article briefly introduces STAF/STAX test automation framework. It also shows how you can use it to build a framework for the automation of tests and continuous integration in a complex test bed.
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Articles 26 Feb 2013
Functional thinking: Why functional programming is on the rise
Java developers should learn functional paradigms now, even if they have no immediate plans to move to a functional language such as Scala or Clojure. Over time, all mainstream languages will become more functional; Neal Ford explores the reasons why in this installment.
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Articles 29 Jan 2013
Look-ahead Java deserialization
When Java serialization is used to exchange information between a client and a server, attackers can try to replace the legitimate serialized stream with malicious data. This article explains the nature of this threat and describes a simple way to protect against it. Find out how to stop the deserialization process as soon as an unexpected Java class is found in the stream.
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Articles 15 Jan 2013
HTML5 2D game development: Implementing Sprite behaviors
In this series, HTML5 maven David Geary shows you how to implement an HTML5 2D video game one step at a time. In this installment, you'll learn how to implement the essence of any video game: sprite behaviors.
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Articles 08 Jan 2013
Agile DevOps: Continuous software delivery in the cloud
When developers and operations work together in a collaborative manner, they often need one place to manage the software delivery process and pipeline of changes. A Continuous Delivery (CD) platform addresses this need. In this Agile DevOps installment, DevOps expert Paul Duvall lays out how you can use OpenDelivery, an open CD platform.
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Articles 08 Jan 2013
Functional thinking: Laziness, Part 2
Implementing lazy evaluation is easy in a language that supports closures. This Functional thinking installment shows how to derive a lazy list using Groovy's closures as building blocks. Then it explores some of the performance and conceptual benefits of lazy evaluation, including the ability to initialize fields lazily in some languages.
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Articles 19 Dec 2012
IBM@JavaOne 2012, Part 2: Roundup of the IBM sessions
IBM was active throughout JavaOne 2012, leading numerous technical talks and birds-of-a-feather (BOF) sessions, participating in panels, and delivering an opening-day keynote. This article summarizes IBM's contributions to the conference. Get synopses of the IBM sessions you might have missed, and view the video or presentation slides for many of them.
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Articles 18 Dec 2012
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
Introduction to VoltDB
Learn about VoltDB, an in-memory database that offers the scalability of NoSQL databases with the ACID-compliance of traditional relational database systems. You'll design and partition database tables, store and retrieve data with stored procedures written in Java code. You'll also explore VoltCache, a key-value store built on top of VoltDB.
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Articles 11 Dec 2012
HTML5 2D game development: Sprites
In this series, HTML5 maven David Geary shows you how to implement an HTML5 2D video game one step at a time. Sprites -- graphical objects that you can assign behaviors to -- are one of the most fundamental and important aspects of video games. In this installment, you'll learn how to implement the sprites that make up Snail Bait's cast of characters.
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Articles 04 Dec 2012
Discover MongoDB quiz
Test your MongoDB knowledge and skills and you'll be able to quickly assess how well you've mastered key information and coding techniques you've learned.
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Articles 04 Dec 2012
Java development 2.0: Scalable searching with ElasticSearch
Like the word google, search technology has evolved tremendously over the past 10 years. Learn how one of the newer cloud-friendly search platforms brings simple, scalable search to your Java enterprise applications.
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Articles 27 Nov 2012
Agile DevOps: Version everything
Which types of software-system artifacts should you version? In this Agile DevOps installment, DevOps expert Paul Duvall recommends that DevOps teams version application code, infrastructure, configuration, data, and even internal system artifacts to gain the capacity to deliver software to users quickly and often.
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Articles 27 Nov 2012
Functional thinking: Laziness, Part 1
A common feature of many functional programming languages is lazy evaluation, whereby expressions are evaluated only when necessary rather than upon declaration. Java doesn't support this style of laziness, but several frameworks and related languages do. This article shows how to build laziness into your Java applications, using pure Java and functional frameworks.
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Articles 20 Nov 2012
Agile DevOps: Test-driven infrastructure
Few in the software industry question that writing automated tests for application code is a good practice. Teams are now applying similar automated testing practices to infrastructure and environments. In this Agile DevOps installment, DevOps expert Paul Duvall covers writing automated tests for your infrastructure using tools such as Cucumber with Gherkin. These tests can be run in conjunction with every scripted change to the infrastructure to ensure quick feedback when a change introduces an error into an environment.
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Articles 06 Nov 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
Configure JMS clustering in IBM SSFS V9.2
IBM Sterling Selling and Fulfillment Suite (SSFS) V9.2 introduces support for JMS clustering. This article explains how to configure JMS clustering to improve the scalability and high availability of SSFS.
Articles 02 Nov 2012
Boost JDBC application performance using the IBM Data Server Driver for JDBC and SQLJ
Developing high performing JDBC applications is not an easy task. This article helps you gain a better understanding of the factors that contribute to your JDBC application performance using the IBM Data Server Driver for JDBC and SQLJ to access DB2 and Informix. Learn to identify these issues and to find and alleviate client-side bottlenecks.
Articles 01 Nov 2012
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