Peter Niblett explains what MQTT is and how it compares with HTTP, showing how to program to it in Java and Eclipse Paho, and reporting on the current MQTT standardization status at OASIS.
Phil Webb offers tips and code samples on how to refactor existing code for the cloud, alternatives to the file system, compiling without the JDK, dealing with gateway timeouts and how to run Tomcat 7
Jim Crossley introduces Immutant – an application server for Clojure, inspired by TorqueBox and powered by JBoss AS7 –, showing a demo application, how to use it, and exploring its API.
Derek Collison presents Cloud Foundry’s architecture with details on the Cloud Controller, the Service Provisioning Agent, the Droplet Execution Agent, and the Messaging System.
Chris Ramsdale shows how to build Spring apps on Google App Engine, covering performance Google SQL Service and other advanced topics.
Lance Ball presents DataMapper, a Ruby ORM library, along with Infinispan, Hibernate Search, Lucene, all running on JBoss AS7 and accessed through TorqueBox, a JRuby application server.
Mark Thomas reviews some of the new features available in Apache Tomcat 7, including: Servlet 3.0, JSP 2.2, EL 2.2, asynchronous request processing, memory leak protection, and security improvements.
Mark Little presents the constituents of a modern SOI and where open source implementations stand in terms of standards, tools, ease of use, performance and reliability.
New in dm Server 2.0: web bundles, SLF4J/LogBack, plan files, Integrated ConfigAdmin, remote repo for dynamic bundle download, improved admin console, SSH-enabled console, unified user/pass store.
Billy Newport discusses the ways that developers interact with key/value stores, entity vs column-oriented approaches, sync vs async operations, large data sets, and collocating closures and data.
Dan North discusses an example of rearchitecting an application without rewriting it from scratch, and explains general strategies for a holistic rearchitecture.
Eoin Woods explains how Barclays Global Investors (BGI) designed Apex to meet the challenges it faces and the Java technologies which were chosen for an architecture with variations on standard J2EE.