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Why to use String

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Recently I was tutoring juniors during a training session. One of the task was to write a class that can dwarwle maps based on some string key. The result one of the juniors created contained the following method:                 void dwarwle(HashMap<String,Dwarwable> mapToDwarwle, String dwarwleKey){ for( final Entry<String, Dwarwable> entry : mapToDwarwle.entrySet()){ dwarwle(entry.getKey(),entry.getValue(),dwarwleKey); } ...

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Java Extension Mechanism Loads All JARs

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The Java Extension Mechanism is described in the Java Tutorial as a “standard, scalable way to make custom APIs available to all applications running on the Java platform.” As described in Understanding Extension Class Loading, “the extension framework makes use of the class-loading delegation mechanism” with extension classes loaded after the bootstrap classes in rt.jar (and related JARs) but before ...

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Docker RabbitMQ cluster

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I have been trying to create a Docker based RabbitMQ cluster on and off for sometime and got it working today – fairly basic and flaky but could be a good starting point for others to improve on. This is how the sample cluster looks on my machine, this is a typical cluster described in the RabbitMQ clustering guide available ...

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Akka Notes – Actor Lifecycle – Basic – 5

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(Please note that this lifecycle write-up does not cover the preRestart or the postRestart methods. We’ll talk about them when we discuss supervision) The basic Actor lifecycle is very much intuitive. You could actually compare the basic Actor lifecycle with a Java servlet lifecycle with one special difference.             Just like any other regular class, ...

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Agile tester part 2, questions and answers

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Warning: The opinions expressed in this post are mine only, please do not use them against any other group of people, but only against me, that is Augusto Evangelisti a.k.a. Gus. After writing my most recent blog post “The Agile Tester, a Curious and Empathetic Animal” I received quite a lot of feedback for which I am very grateful. Feedback in ...

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Supercharged jstack: How to Debug Your Servers at 100mph

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A guide for using jstack to debug live Java production servers jstack is like U2 – it’s been with us since the dawn of time, and we can’t seem to be rid of it. Jokes aside, jstack is by far one of the handiest tools in your arsenal to debug a live production server. Even so, I still feel it’s deeply underused ...

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Is Your Culture Working the Way You Think it Is?

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Long ago, I was a project manager and senior engineer for a company undergoing a Change Transformation. You know the kind, where the culture changes, along with the process. The senior managers had bought into the changes. The middle managers were muddling through, implementing the changes as best they could. Us project managers and the technical staff, we were the ...

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4 Biggest Reasons Why Software Developers Suck at Estimation

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Estimation is difficult. Most people aren’t good at it–even in mundane situations. For example, when my wife asks me how much longer it will take me to fix some issue I’m working on or to head home, I almost always invariably reply “five minutes.” I almost always honestly believe it will only take five minutes, but it never does. Most ...

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Revealing the length of Garbage Collection pauses

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There are several ways to improve your product. One such way is to carefully track what your users are experiencing and improve based on that. We do apply this technique ourselves and have again spent some time looking at different data Besides many other aspects we were after, we also posed a question “what is the worst-case effect for latency ...

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