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Java8 Lambdas: Sorting Performance Pitfall EXPLAINED

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Written in collaboration with Peter Lawrey. A few days ago I raised a serious problem with the performance of sorting using the new Java8 declarative style. See blogpost here.  In that post I only pointed out the issue but in this post I’m going to go a bit deeper into understanding and explaining the causes of the problem.  This will ...

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Logging to Redis using Spring Boot and Logback

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When doing centralized logging, e.g. using Elasticsearch, Logstash and Kibana or Graylog2 you have several options available for your Java application. You can either write your standard application logs and parse those using Logstash, either consumed directly or shipped to another machine using something like logstash-forwarder. Alternatively you can write in a more appropriate format like JSON directly so the ...

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Separating Integration Tests from Unit Tests Using Maven Failsafe & JUnit @Category

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Why Unit Tests Should Run Separately From Integration Tests TDD at the Unit Testing level is fairly straight-forward, since classes in unit testing either do not have complex dependencies, or you mock-out the dependencies with a mocking framework (ex. Mockito). However, TDD quickly becomes difficult when we get to Integration Testing. Integration Testing is basically testing a component with some or all ...

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How to Translate SQL GROUP BY and Aggregations to Java 8

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I couldn’t resist. I have read this question by Hugo Prudente on Stack Overflow. And I knew there had to be a better way than what the JDK has to offer. The question reads:               I’m looking for a lambda to refine the data already retrieved. I have a raw resultset, if the user ...

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Vagrant with Docker provider, using WildFly and Java EE 7 image

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What is Vagrant? Vagrant is a simplified and portable way to create virtual development environments. It works with multiple virtualization software such as VirtualBox, VMWare, AWS, and more. It also works with multiple configuration software such as Ansible, Chef, Puppet, or Salt. No more “works on my machine”!   The usual providers are, well, usual. Starting with version 1.6, Docker containers ...

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Which UX Skills should Product Owners and Product Managers have?

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Summary Providing a great user experience is a must for many digital products, and user experience (UX) design has consequently become prominent in recent years. Does this mean that product owners and product managers should become UX experts? Who should design the UX and which UX skills should product owners and product managers have? Read on to find out my ...

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Acision launches “forgeathon” – its first WebRTC app challenge

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Acision launches “forgeathon” – its first online richer communications (WebRTC) app challenge for developers globally  Join forgeathon and let Acision help you take your application or service global! Reading, UK – 6th January 2015: Acision, the global leader in secure, mobile engagement services and an industry innovator in WebRTC technology, today announces the launch of its first online “forgeathon” – ...

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Apache FOP Integration with Eclipse and OSGi

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Apache FOP is an open source print processor driven by XSL formatting objects (XSL-FO). It can be quite useful to transform data objects into a PDF for example. However it turned out to be somewhat cumbersome to get it integrated into PDE and finally up and running as OSGi Service. Because of this I provided a P2 repository that contains ...

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Mixing memory unit messages

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One of my pet hates is developers messing up units of memory.  In general, the difference doesn’t matter much, or you can work out what they meant to say, but it does annoy me when developers who should know better appear to be confused about what they are trying to say. From Wikipedia’s Byte page, here is a cheat sheet of ...

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Fork/Join Framework vs. Parallel Streams vs. ExecutorService: The Ultimate Fork/Join Benchmark

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How does the Fork/Join framework act under different configurations? Just like the upcoming episode of Star Wars, there has been a lot of excitement mixed with criticism around Java 8 parallelism. The syntactic sugar of parallel streams brought some hype almost like the new lightsaber we’ve seen in the trailer. With many ways now to do parallelism in Java, we ...

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