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Technical debt & the Boiling Frog

I hope everybody among my readers is familiar with the concept of technical debt: If you do a quick hack to implement a feature it might be faster to implement in the short run, but you have to pay interest for the technical debt in the form of higher development and maintenance effort. If you don’t pay back you technical ...

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What is NoSQL ?

NoSQL is a term used to refer to a class of database systems that differ from the traditional relational database management systems (RDBMS) in many ways. RDBMSs are accessed using SQL. Hence the term NoSQL implies not accessed by SQL. More specifically not RDBMS or more accurately not relational. Some key characteristics of NqSQL databases are : They are distributed, ...

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Understanding the Vertical Slice

One of the biggest challenges in breaking down backlogs is knowing how to split up the work from a backlog into right sized pieces. I’ve already talked about the concept that smaller is better, but I we haven’t really addressed the decision of how to actually divide a backlog up to make it smaller. The default path Most developers trying ...

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Regular Unit Tests and Stubs – Testing Techniques 4

My last blog was the third in a series of blogs on approaches to testing code and discussing what you do and don’t have to test. It’s based around my simple scenario of retrieving an address from a database using a very common pattern: …and I proffered the idea that any class that doesn’t contain any logic doesn’t really need ...

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Devoxx 2011 Impressions

Devoxx 2011 is over, and it was awesome. Finally, after having to spend the weekend with wife and kid (haven’t seen much of me the last week), I’ve found the time to write down some stuff. It was for me the sixth Devoxx, my first one being in 2006 – back when I was still a student and it was ...

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Best Of The Week – 2011 – W47

Hello guys, Time for the “Best Of The Week” links for the week that just passed. Here are some links that drew Java Code Geeks attention: * Monitor and diagnose Java applications: An amazing collection of Developerworks articles on monitoring and diagnosing Java applications using both tools available in the JDK and third party software. Also check out Monitoring OpenJDK ...

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What Should you Unit Test? – Testing Techniques 3

I was in the office yesterday, talking about testing to one of my colleagues who was a little unconvinced by writing unit tests. One of the reasons that he was using was that some tests seem meaningless, which brings me on the the subject of what exactly you unit test, and what you don’t need to bother with. Consider a ...

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How to Fail With Drools or Any Other Tool/Framework/Library

What I like most at conferences are reports of someone’s failure to do or implement something for they’re the best sources of learning. And How to Fail with Drools (in Norwegian) by C. Dannevig of Know IT at JavaZone 2011 is one of them. I’d like to summarize what they learned and extend it for introduction of a tool, framework, ...

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The Misuse of End To End Tests – Testing Techniques 2

My last blog was the first in a series of blogs on approaches to testing code, outlining a simple scenario of retrieving an address from a database using a very common pattern: …and describing a very common testing technique: not writing tests and doing everything manually. Today’s blog covers another practise which I also feel is sub-optimal. In this scenario, ...

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