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Java – Handmade Classloader Isolation


In a recent project we had a typical libraries conflict problem. One component that we could control wanted a specific version of an Apache Commons library, while another component was expecting a different one. Due to external constraints we could not specify any class loading isolation at the Container level. It wasn’t an option for us. What we decided to ...

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Using twitter4j with Play! Framework and Secure Social is this easy


Dur­ing yesterday’s per­sonal Hackathon, I started a project which I might intro­duce here some­time. But the coolest rev­e­la­tion was (again) how easy it was to get up and running. Cre­ate a new Play Project Add Secure Social and con­fig­ure it for Twit­ter, and use the InMem­o­ryUserSer­vice from the exam­ples. (all this is described here and only takes a minute) ...

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Easy testing SLAs on distributed components with grep4j


So your distributed architecture looks something like the picture below and you just have received a requirement from the business to make sure that the SLAs of the messages sent by the Producer and then traveling to the downstream systems (consumers) must be fast and never slower than 400 milliseconds. Requirement says : The Latency of a message sent from ...

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Test driving Java API for Processing JSON with GlassFish 4.0


Writing and contributing to a specification is one thing. Working with it and looking into real examples a pre-condition if you want to give valuable feedback. The latest promoted GlassFish builds contain the renaming to 4.0 and I thought it might be a good time to give the Java API for Processing JSON (JSON-P) a test drive. Get Java EE ...

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Most popular Java environments


The post is going to be the first in the forthcoming series. We start with the environments used: if you are interested which is the most popular JVM vendor or JVM version, whether 32bit is more popular architecture than 64bit or whether Windows 8 is more popular than Windows XP – this will all be covered in our post. In ...

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Chronicle and the Micro-Cloud


Overview A common question I face is; how do you scale a Chronicle based system if it is single writer, multiple readers. While there are solutions to this problem, it is far more likely it won’t be a problem at all. The Micro-Cloud This is the term I have been using to describe a single thread to do the work ...

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Using Twitter4j with Scala to perform user actions


Introduction My previous post showed how to use Twitter4j in Scala to access Twitter streams. This post shows how to control a Twitter user’s actions using Twitter4j. The primary purpose of this functionality is perhaps to create interfaces for Twitter like TweetDeck, but it can also be used to create bots that take automated actions on Twitter (one bot I’m ...

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ListenableFuture in Guava


ListenableFuture in Guava is an attempt to define consistent API for Future objects to register completion callbacks. With the ability to add callback when Future completes, we can asynchronously and effectively respond to incoming events. If your application is highly concurrent with lots of future objects, I strongly recommend using ListenableFuture whenever you can. Technically ListenableFuture extends Future interface by ...

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Spring Data, MongoDB and JSF Integration tutorial


Introduction to sample application (MongoShop Product Catalog) After this tutorial, a sample application (MongoShop Product Catalog) with the following functional requirement will be built:               1. Searching product with different criteria (e.g. sku, product type, title, stc) 2. Create a new product with different category. 3. Edit selected product details 4. Delete selected product ...

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Tweeting StackExchange with Spring Social – part 1


This article will cover a quick side-project – a bot to automatically tweet Top Questions from the various Q&A StackExchange sites, such as StackOverflow, ServerFault, SuperUser, etc. We will build a simple client for the StackExchange API and then we’ll setup the interaction with the Twitter API using Spring Social – this first part will focus on the StackExchange Client ...

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