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Scaling Agile Heuristics – SAFe or not!

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If I’m being honest, I feel as if I don’t know much about scaling agile. But when I think about it I think the issue is really: What do you mean when you say “scaling agile?” It seems to me you might mean one of three things: How do you make agile work with a big team? Not just 7 ...

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Personal Behavior-Driven Development

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This year I was fortunate enough to attend the KCDC conference here in lovely Kansas City. One of the sessions I attended was on Behavior-Driven Development. I have attended several BDD sessions before and have enjoyed each one of them, but there was one stated question that set this one apart from the others. After learning of all the benefits of ...

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10 Subtle Best Practices when Coding Java

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This is a list of 10 best practices that are more subtle than your average Josh Bloch Effective Java rule. While Josh Bloch’s list is very easy to learn and concerns everyday situations, this list here contains less common situations involving API / SPI design that may have a big effect nontheless. I have encountered these things while writing and ...

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How To Implement Input Validation For REST resources

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How To Implement Input Validation For REST resources The SaaS platform I’m working on has a RESTful interface that accepts XML payloads. Implementing REST Resources For a Java shop like us, it makes sense to use JAX-B to generate JavaBean classes from an XML Schema. Working with XML (and JSON) payloads using JAX-B is very easy in a JAX-RS environment like ...

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Redis as data store: Installation

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Introduction Redis is open-source, advanced key-value data store server. It is counted as Nosql database for the key-value store category. It is more than just the cache server. It is more of data structure server as it supports data units as lists, sets, hashes and sorted set and It is very blazing fast in terms of performance. In this first ...

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How to configure SLF4J with different logger implementations

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There are many good benefits in using slf4j library as your Java application logging API layer. Here I will show few examples on how to use and configure it with different loggers. You can think of slf4j as an Java interface, and then you would need an implementation (ONLY ONE) at runtime to provide the actual logging details, such as ...

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Long Polling Tomcat with Spring

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“Ooh err Missus” as comedian Frankie Howerd would have said, but enough of British innuendo and double entendre because Long Polling Tomcat isn’t some kind of sexual deviance with next door’s moggy, it’s a technique (or more of a hack) that’s been developed as a result of Steve Jobs’s refusal to support Adobe Flash Player on the iPhone and iPad. ...

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Writing a Hadoop MapReduce task in Java

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Although Hadoop Framework itself is created with Java the MapReduce jobs can be written in many different languages. In this post I show how to create a MapReduce job in Java based on a Maven project like any other Java project.                 Prepare the example input Lets start with a fictional business case. ...

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Creating a price model using k-Nearest Neighbours + Genetic Algorithm

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Chapter 8 of Programming Collective Intelligence (PCI) explains the usage and implementation of the k-Nearest Neighbours algorithm. (k-NN). Simply put: k-NN is a classification algorithm that uses (k) for the number of neighbours to determine what class an item will belong to.  To determine the neighbours to be used the algorithm uses a distance / similarity score function, in this example (Euclidian Distance). ...

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