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Oracle ships Java 8

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Oracle has decided to ship upgrade to JDK (Java Development Kit) 8 on March 18, even though the new release may come with a few bugs, as introduced by Full speed ahead: Oracle to ship Java 8 in March, even with bugs. Oracle JDK 8 release manager, Mathias Axelsson has explained that for the initial JDK 8 release, which will ...

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Three flavours of request-response pattern in Akka

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Imagine a simple Akka actor system consisting of two parties: MonitoringActor and NetworkActor. Whenever someone (client) sends CheckHealth to the former one it asks the latter by sending Ping. NetworkActor is obligated to reply with Pong as soon as possible (scenario [A]). Once MonitoringActor receives such a reply it immediately replies to the client with Up status message. However MonitoringActor ...

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Why The Web Isn’t Semantic Yet

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The semantic web. You’ve heard about it. What is it? Chances are, you don’t have a completely clear idea. But why isn’t the web “semantic” yet? First, it’s complex to understand. There are tons of standards around it – RDF, RDFa, RDFS, URI, OWL, SPARQL, etc. It’s hard to get started, because you have to put a lot of unfamiliar ...

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Spring Integration Publisher

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Consider a hypothetical requirement – You have a service class in your application and you want to capture some information around the calls to this service:                   @Service public class SampleBean { private static final Logger logger = LoggerFactory.getLogger(SampleBean.class); public Response call(Request request) { logger.info("SampleBean.call invoked"); return new Response(true); } } AOP ...

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Evolving Gradle Build from Ant Build: Importing Ant Build File

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Changing the build system on a large project can be difficult and a lot of work. Fortunately for those migrating Ant builds to Gradle builds, Gradle provides particularly convenient mechanisms to facilitate this migration. Because Gradle is built on Groovy and Groovy includes built-in Ant support via AntBuilder, Gradle builds can use AntBuilder to call Ant tasks and run Ant ...

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Turning Twitter4J into RxJava’s Observable

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aTwitter4J is a Java wrapper around Twitter API. While Twitter supports simple request-response interactions in this article we will explore streaming APIs. In contrary to request-response model which is always initiated by the client, streaming API pushes data from Twitter server to the clients as soon as they are available. Of course in case of Twitter we are talking about ...

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Programmers without TDD will be unemployable by 2022 (a prediction)

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New year is traditionally the time of predictions, and several of the blogs I read have been engaging in predictions (e.g. Ian Sommerville “Software Engineerng looking forward 20 years.”). This is not a tradition I usually engage in myself but for once I’d like to make one. (I’ll get back to software economics next time, I need to make some ...

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Post-hoc tracing using a debugger

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Once nice little features of most debuggers that I have been exercising recently is the ability to log information on a breakpoint. This can be a really useful was to understand code without having to modify it is involve byte code modification. Let’s consider this very trivial and inefficient implementation of a function to return the n’th number in the ...

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A Camel Demo for Amazon’s Simple Worklfow Service

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In a previous post I explained why AWS SWF service is good and announced the new Camel SWF component. Now the component documentation is ready and here is a simplistic fully working demo. It consist of three independent standalone Camel routes: A workflow producer allows us to interact with a workflow. It can start a new workflow execution, query its ...

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