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Hidden Assumption of Agile

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Agile cures common problems that we experience in software development, however, there are limitations to Agile.  It may seem like a silver bullet, but there are circumstances under which Agile is not the best choice for development, or at a minimum, not to develop the entire project. The problems with the waterfall model are well known and understood by most ...

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Savepoints in Apache Flink Stream Processing – Whiteboard Walkthrough

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In this week’s Whiteboard Walkthrough, Stephan Ewen, PMC member of Apache Flink and CTO of data Artisans, explains how to use savepoints, a unique feature in Apache Flink stream processing, to let you reprocess data, do bug fixes, deal with upgrades, and do A/B testing. Here’s the undedited transcription: Hello. My name is Stephan. I’m one of the original creators ...

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The “Goal” of Performance Tuning

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How do we make our programs faster? How do we make anything faster? My first co-op job was working in packaging. They had a small Industrial Engineering library and let me read from it at work. The first book I read changed my life and my way of thinking about problem solving: The Goal by Eliyahu M. Goldratt. Just about ...

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How I Chose my Replacement for Parse.com

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When I first read the announcement that Parse.com would shut down on January 28th 2017, I went from disbelief (it’s probably an early April fool’s joke) to rage (how could they do that?!) to sadness (oh no! it was a great service) and finally to utter confusion (where do I go from here and what do I do with my ...

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Benchmarking the message queue based Activiti Async Executor

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A bit of history One thing that never ceases to amaze me is how Activiti is being used in some very large organisations at some very impressive scales. In the past, this has led to various optimizations and refactorings, amongst which was the async executor – replacement for the old job executor. For the uninitiated: these executors handle timers and async continuations in ...

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JAXB and Log4j XML Configuration Files

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Both Log4j 1.x and Log4j 2.x support use of XML files to specify logging configuration. This post looks into some of the nuances and subtleties associated with using JAXB to work with these XML configuration files via Java classes. The examples in this post are based on Apache Log4j 1.2.17, Apache Log4j 2.6.2, and Java 1.8.0_73 with JAXB xjc 2.2.8-b130911.1802. ...

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Token Authentication for Java Applications

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Building Identity Management, including authentication and authorization? Try Stormpath! Our REST API and robust Java SDK support can eliminate your security risk and can be implemented in minutes. Sign up, and never build auth again! Update 5/12/2016: Building a Java application? JJWT is a Java library providing end-to-end JWT creation and verification, developed by our very own Les Hazlewood. Forever ...

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Git Tutorial – The Ultimate Guide

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Git is, without any doubt, the most popular version control system. Ironically, there are other version control systems easier to learn and to use, but, despite that, Git is the favorite option for developers, which is quite clarifying about the powerfulness of Git. This guide will cover all the topics needed to know in order to use Git properly, from ...

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Developing Modern Applications with Scala: Reactive Applications

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1. Introduction In the last couple of years many software systems, used by millions and even billions of people every day, have started to face unprecedented scalability requirements. In many regard the traditional software architectures were pushed to its limits, unveiling the urgent need to come up with other architectural styles which better suit the demands of the modern world. ...

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One-shot Delete with Hibernate (JPA)

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In older versions of Hibernate, I can see the one-shot delete indicated in the manual. But newer versions no longer have this section. I’m not sure why. So, in this post, I take a look if it still works. The one-shot delete section says: Deleting collection elements one by one can sometimes be extremely inefficient. Hibernate knows not to do ...

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