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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
Editor's picks: Top five WebSphere Liberty tutorials
If there is one thing that IBM WebSphere Liberty gives you, it's the freedom, and flexibility, to dynamically create applications both on-premises and in the cloud. This article highlights the top five tutorials in developerWorks for WebSphere Liberty.
Also available in: Chinese  
Articles 31 Oct 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: 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: 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: 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: 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
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.
Also available in: Chinese   Japanese  
Articles 18 Jul 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.
Also available in: Chinese   Japanese  
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.
Also available in: Chinese   Japanese  
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
Revitalize your Java EE app with IBM Bluemix services
Migrate existing applications to IBM Bluemix services such as SQLDB, Session Cache, and Auto-Scaling. The sample application you will work with is CloudTrader, a new app created from a ten-year-old day trading application.
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Tutorial 12 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 ...: 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
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
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
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
Move your Java application into a hybrid cloud using Bluemix, Part 4
Use Secure Gateway to connect a Java Platform, Enterprise Edition application that runs in Bluemix to a relational database that runs outside of Bluemix.
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Tutorial 17 Feb 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
Move your Java application into a hybrid cloud using Bluemix, Part 3
In this article, we examine how to run stand-alone Java programs in Bluemix. We also share some expert hints on navigating the Cloud Foundry documentation, using the CF command-line tool, and debugging in Cloud Foundry and Bluemix.
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Articles 26 Oct 2015
Move your Java application into a hybrid cloud using Bluemix, Part 2
Want to quickly migrate a Tomcat application to IBM Bluemix using Eclipse tooling? This tutorial provides step-by-step directions to set up Eclipse tooling to analyze, migrate, and deploy a Tomcat application to the Liberty for Java runtime in Bluemix. We show you how to set up both the Java runtime and the SQL Database, and how to bind the application to the database.
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Articles 21 Oct 2015
Move your Java application into a hybrid cloud using Bluemix, Part 1
In this article, we show you how to tier a hybrid application, and we guide you step by step through migrating parts of your Tomcat or WebSphere applications to Bluemix, while connecting to services best left within your enterprise. We introduce a tool you can use to determine if your application will run in the Bluemix Liberty Java buildpack, and we show you how to connect to an SQL database in the cloud or on-premise. We'll also explain how to update an application for important cloud considerations including session persistence, scaling, and logging.
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Articles 15 Oct 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
Data integration at scale: Explore OSLC examples
Explore simple but useful examples of how the conceptual layers presented so far in this series combine to integrate information easily and seamlessly across various tools. The examples use Open Services for Lifecycle Collaboration (OSLC) vocabularies and standards, but they are equally useful for any group of participants wanting to connect information quickly to find value across data stores.
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Articles 02 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
Build a data mining app using Java, Weka, and the dashDB service
The dashDB (formerly known as Analytics Warehouse and BLU Acceleration) service provides data warehousing and analytics as a service on IBM Bluemix. Developers can develop and deploy a heavy-duty analytic application using blazing-fast IBM BLU database technology offered in the cloud. Learn how to develop a data mining application using the Weka statistical analysis tool and leveraging the IBM BLU columnar database.
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Articles 08 May 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
Use a Liberty JAAS login module for Bluemix single sign-on
This tutorial provides a technique for Liberty-aware authentication with the Bluemix SSO service. Create a sample app that uses the Bluemix SSO service for user login; the Liberty server creates all necessary objects (Subject, Principal, Session) upon successful authentication. A Liberty app can obtain Bluemix SSO capabilities using JAAS authentication with the SSO service so that your authentication mechanism is abstracted from application code.
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Articles 24 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
Create and manage cloud applications with Java
For full, continuous integration, you need to automate deployment of applications in the cloud. This tutorial includes examples that show how to use the Cloud Foundry Java Client Library to automate how you create and manage apps in IBM Bluemix.
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Articles 10 Feb 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
From the developerWorks trenches: The best open technologies content in 2014
As developerWorks celebrates its 15th anniversary, the technical landscape has never been more exciting or complex. Myriad products, projects, technologies, and techniques abound. Let us cut through the noise and provide a quick look at what's hot right now.
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Articles 16 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
Build a portable Java travel app that integrates web services
Learn how to develop and deploy a Java PaaS web app on the cloud.
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Articles 27 Jun 2014
Use Software Defined Networking to optimize your IaaS
Explore Software Defined Networking (SDN) network management via software abstraction layers as a method to enhance and optimize your Infrastructure as a Service in the areas of interoperability, user and provider expectation management, developer and administrator requirements, and effective risk mitigation.
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Articles 24 Jun 2014
Use SLDT to transfer data to SoftLayer object storage
SoftLayer provides an object storage service that is based on OpenStack Swift. You can transfer files to and from the object store by using the SoftLayer APIs and a command-line tool like cURL, but that can be tedious for large files. This article describes how to use a simple Java tool, SLDT, to handle authentication, object segmenting, and data transfer to and from the SoftLayer object store.
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Articles 24 Jun 2014
Create IBM SmartCloud Orchestrator-compatible images for Windows
Creating images you can deploy through IBM SmartCloud Orchestrator requires knowledge of the operating system, the hypervisor on which the images are going to be deployed, and the corresponding hypervisor manager. Learn how to easily and smoothly prepare a SmartCloud Orchestrator-compatible image for Windows.
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Articles 10 Jun 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
Java.next: Java 8 as Java.next
This installment of Java.next investigates the Java 8 release as a reasonable candidate for your next programming language. Find out how lambda blocks and the streaming API upgrade Java to a modern language.
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Articles 28 Apr 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
Java.next: Functional coding styles
All of the Java.next languages include functional programming constructs, which enable you to think at a higher level of abstraction. However, differences in terminology among the languages can make it difficult to see similar constructs. This installment shows how common functional programming constructs manifest in the Java.next languages, pointing out some subtle differences in the implementation details of those features.
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Articles 24 Dec 2013
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 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
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 5: Optimizing your application with the Health Center
IBM Monitoring and Diagnostic Tools for Java - Health Center is a tool for monitoring a running Java application. It reports on all aspects of system health via charts, graphs, and tables, and it makes recommendations for fixing problems. The Health Center includes an extremely low-overhead method profiler, a garbage-collection visualizer, a locking profiler to identify contention bottlenecks, and a configuration explorer. Find out how you can use this tool to diagnose and fix performance, configuration, and stability issues in your applications.
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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: 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
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
Mobile for the masses: Take a swipe at it! Programming gestures in Android
Mobile users are typically distracted, busy, and ergonomically constrained, so build your mobile application UIs accordingly. Andrew Glover discusses key factors that differentiate mobile apps from web apps, then guides you through the creation of a mobile application UI that uses swipe gestures for navigation rather than button clicks.
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Articles 23 Apr 2013
Define a multithreading threshold when building SaaS applications
While on-premise COBOL programs have been successfully transformed into Java-based SaaS applications, there are multithreading issues developers should watch out for when interfacing COBOL and Java with one another in a SaaS application. The author illustrates what proactive actions to take in a multithreaded SaaS failure scenario.
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Articles 18 Apr 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
Build a text visualization and analytics application
Text visualization is an effective way to see and analyze what a designated text is saying. Learn to combine Eclipse and open source text visualization and analytics tools to build a word-wave application that visualizes and compares two texts.
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Articles 02 Apr 2013
Mobile for the masses: A gentle introduction to Android
The mobile landscape is rich with promise, and Android is a viable and exciting platform for developers who seek a way in. This new series starts with an introduction to Android that is tailored specifically for Java developers just getting started with mobile. Learn about Android's three-layer versioning system (and find out why it matters), then set up your development environment and build your first Android app.
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Articles 05 Mar 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
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
Monitor a Java application with the Health Center API, Part 2
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. Part 2 of this series takes the deadlock detection application from Part 1 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
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
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