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Waterfall works when…


I frequently find myself in situations where someone says something like: “Waterfall is appropriate when…” Some people out there think there are occasions when an Agile (mainly iterative) approach is “best’ and other occasions when “Waterfall” is “best”. Most of the time I let this line of argument go because its boring, I can’t be bothered arguing. (I’ll look at ...

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Neo4j: Generating real time recommendations with Cypher


One of the most common uses of Neo4j is for building real time recommendation engines and a common theme is that they make use of lots of different bits of data to come up with an interesting recommendation. For example in this video Amanda shows how dating websites build real time recommendation engines by starting with social connections and then ...

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Replanning your project with a time machine


I have an amazing time machine that lets me think better about projects. This is part 1 in a series of blog posts exploring the use of a time machine. Let’s say that you have a project that has been running for a couple of months. Looking back at your issue tracker and other artifacts, you notice that it’s hard ...

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InetAddressImpl#lookupAllHostAddr slow/hangs


Since I upgraded to Yosemite I’ve noticed that attempts to resolve localhost on my home network have been taking ages (sometimes over a minute) so I thought I’d try and work out why. This is what my initial /etc/hosts file looked like based on the assumption that my machine’s hostname was teetotal: $ cat /etc/hosts ## # Host Database # ...

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Aggregate Installation Tips


Aggregate Installation Tips One of the reasons I am writing this blog, is to keep “log” for myself on how I resolved issues. In this post I will describe how I installed several basic development tools on a Fedora OS. I want this laptop to be my workstation for out-of-work projects. Almost everything in this post can be found elsewhere ...

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The Magic Setter Antipattern


Setters and getter are evil. When the JavaBean definition was created it seemed to be a good idea. But they do a lot of harm to the Java community. Not as many as the null pointer generally, but enough. The very first thing is that many juniors believe that implementing setters and getter (hey, it is just a few click ...

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Why Managers Ask for Estimates and What They Need to Know


In many of my transitioning to agile clients, the managers want to know when the project will be done. Or, they want to know how much the project will cost. (I have a new book about this, Predicting the Unpredictable: Pragmatic Approaches to Estimating Cost or Schedule.) Managers ask for estimates because they want to know something about their ability ...

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How to batch DELETE statements with Hibernate


Introduction In my previous post, I explained the Hibernate configurations required for batching INSERT and UPDATE statements. This post will continue this topic with DELETE statements batching. Domain model entities We’ll start with the following entity model:       The Post entity has a one-to-many association to a Comment and a one-to-one relationship with the PostDetails entity: @OneToMany(cascade = ...

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Hack up a Simple JDBC ResultSet Cache Using jOOQ’s MockDataProvider


Some queries shouldn’t hit the database all the time. When you query for master data (such as system settings, languages, translations, etc.), for instance, you may want to avoid sending the same silly query (and the results) over the wire all the time. For example: SELECT * FROM languages Most databases maintain buffer caches to accelerate these queries, so you ...

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My Talks During JDays2015


Last week I had the chance to be part of a great event in a beautiful and peaceful city of Sweden : jDays @ Göteborg I was amazed about the diversity of talks – although the conference is mostly about java – and the quality of the presentations. I attended some general talks like the “Future of Programming Languages” by Ola ...

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