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How To Implement hashCode Correctly


So you’ve decided that identity isn’t enough for you and wrote a nice equals implementation? Great! But now you have to implement hashCode as well. Let’s see why and how to do it correctly. Equality and Hash Code While equality makes sense from a general perspective, hash codes are much more technical. If we were being a little hard on ...

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[MEGA DEAL] Complete Linux System Administrator Bundle (96% off)


From Installation to Administration–118 Hours of Training to Become a Linux Pro Hey fellow geeks, This week, on our JCG Deals store, we have an extreme offer. We are offering the Complete Linux System Administrator Bundle for only $69 instead of the original price of $2,100, yeap that is a massive 96% off. Take your Linux abilities to the next ...

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What’s the Difference? Creating Diffs with JGit


In this post, I will dig into the details of how to diff revisions and create patches with JGit. Starting from the high-level DiffCommand all the way down to the more versatile APIs to find particular changes in a file. DiffCommand, Take I The diff command can be used to compare two revisions and report which files were changed, added ...

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Developing Modern Applications with Scala: Build with SBT


1. Introduction For many experienced Java developers, Scala programming language is not a stranger. It’s been around for quite a while now (officially, since first public release in 2004) and gained quite a lot of traction in the recent years. There are many reasons why one is going to pick Scala over Java, Clojure, Groovy, Kotlin, Ceylon, … and we ...

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How the Secure Scripting in Activiti works


One of the prominent features of the recent Activiti 5.21.0 release is ‘secure scripting’. The way to enable and use this feature is documented in detail in the Activiti user guide. In this post, I’ll show you how we came to its final implementation and what it’s doing under the hood. And of course, as it is my usual signature style, ...

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IntelliJ Scala and Apache Spark – Well, Now You Know


IntelliJ Scala and Spark Setup Overview In this post, we’re going to review one way to setup IntelliJ for Scala and Spark development.  The IntelliJ Scala combination is the best, free setup for Scala and Spark development.  And I have nothing against ScalaIDE (Eclipse for Scala) or using editors such as Sublime.  I switched from Eclipse years ago and haven’t ...

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Some things can never be spoken


“Some things can never be spoken Some things cannot be pronounced That word does not exist in any language It will never be uttered by a human mouth” Talking Heads, Give me back my name, Little Creates 1985 Some things shouldn’t be spoken. Some things shouldn’t be targeted, some things should be created as a side effect. In Life, the ...

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Agile Economics: The Cost of Change


In the agile world, we’re told to “embrace change”. As we can see in the picture on the right, change can embrace you back, and it can hurt. But what is the cost of change? And how does agile affect it? Economically speaking, change has both reasons and affects, and both have economic consequences. In Winston Royce’s original waterfall document, he said ...

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Building your own Slack bot


There are many cool things one can do to leverage the power of Slack – private channels, embedding various content, searching all the messages from one place, sharing files and code, using some of the many available integrations or building one yourself. In this post I will focus on the last one. I have finished such an implementation myself recently. ...

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How NOT to Appear Desperate in a Job Search


Whether you are happy employed, “between jobs,” or suffering from habitual unemployment, it’s helpful to be conscious of the image you are projecting during a job search. There is real potential damage to job seekers who appear desperate, with two rather simple explanations. 1 – Employers may be more likely to take advantage. Applicants that appear the most desperate for work ...

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