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FREE Programming books with the WCG Newsletter

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Dear fellow geek, it is with great honor that we announce the launch of Web Code Geeks! This is our sister site, targeted to Web programming developers. Come on, admit it, there is a web developer inside you too, so make sure to check it out. To celebrate this, we have decided to distribute 4 of our books for free. ...

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Java EE 8 MVC: Getting started with Ozark

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About a year ago a new action based MVC framework, simply called MVC, was announced for Java EE 8. MVC (specified in JSR 371) is based on JAX-RS and integrates with Java EE technologies like CDI and Bean Validation. The reference implementation for MVC 1.0 is Ozark. This is the first article of a multi-part tutorial I am planning to ...

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An Unexpected Allocation – JIT Compilation Jitter

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Whilst working on ByteWatcher (see my last post) I came across something rather strange. This is the actual code snippet used to find out how much allocation there has been on a particular thread: return (long) mBeanServer.invoke( name, GET_THREAD_ALLOCATED_BYTES, PARAMS, SIGNATURE ); For the full context see here. (The way ByteWatcher works is to call this method periodically to monitor allocation.) One ...

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Squeezing data into the data structure

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This story is about a capacity optimization task that we recently carried out at Plumbr. It all started with an innocent-looking requirement being added to the existing mix. As you might know, Plumbr monitoring solution is distributed as a Java Agent which connects to a Server. The small addition required to keep track of all the connected Agents over time so ...

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Dependency injection: syntax sugar over function composition

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Quoting Dependency Injection Demystified: “Dependency Injection” is a 25-dollar term for a 5-cent concept. *James Shore, 22 Mar, 2006 Dependency injection, as much as it is important when writing testable, composable and well-structured applications, means nothing more than having objects with constructors. In this article I want to show you how dependency injection is basically just a syntax sugar that ...

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Spark Backend for Apache Gora

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I’ve worked for Spark backend of Apache Gora as my GSoC 2015 project and finished it. At this blog post, I’ll explain how it works and how to use it. First of all, I suggest you to read my previous posts about my GSoC 2015 acceptance: http://furkankamaci.com/gsoc-2015-acceptance-for-apache-gora/ and Apache Gora: http://www.javacodegeeks.com/2015/08/in-memory-data-model-and-persistence-for-big-data.html if you haven’t read them. Apache Gora provides an in-memory data model and persistence ...

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Continuous Delivery of Fusion Middleware applications with FlexDeploy

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Any IT organization sooner or later has to deal with such thing as Continuous Delivery (CD). They realize that there are various environments such as development, QA, support, UAT, production, etc. and there are a number of different systems working in those environments. At some point managing all that stuff manually becomes just impossible and should be automated. There is ...

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Couchbase Java SDK with Rx-Java

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A neat thing about CouchbaseJava SDK  is that it is built on top of the excellent Rx-Java library, this enables a reactive way to interact with a Couchbase server instance which is very intuitive once you get the hang of it. Consider a very simple json document that I intend to store in Couchbase: {"key":"1","value":"one"} and a Java class to hold ...

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New Releases with a Better Kotlin API, Dataflow for Clojure and Faster Web Actors

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Today we have released minor updates to Quasar, Pulsar and Comsat. The releases contain bug fixes, and some new features including an improved Kotlin API, dataflow variables for Clojure and fast implementations of Web Actors on top of Undertow and Netty. Elegant fibers and channel selection with Kotlin Quasar 0.7.0 introduced a natural Kotlin API (that feels like Erlang) for Quasar ...

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Displaying progress of Spring application startup in web browser

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When you restart your enterprise application, what do your clients see when they open the web browser? They see nothing, server doesn’t respond yet so web browser displays ERR_CONNECTION_REFUSED Web proxy (if any) in front of your application notices that it’s down and display “friendly” error message The website takes forever to load – it accepted socket connection and HTTP ...

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