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Java 8 Friday: 10 Subtle Mistakes When Using the Streams API

At Data Geekery, we love Java. And as we’re really into jOOQ’s fluent API and query DSL, we’re absolutely thrilled about what Java 8 will bring to our ecosystem. Java 8 Friday Every Friday, we’re showing you a couple of nice new tutorial-style Java 8 features, which take advantage of lambda expressions, extension methods, and other great stuff. You’ll find ...

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#NoEstimates

The main difficulty with forecasting the future is that it hasn’t yet happened. – James Burke When I first heard about #NoEstimates, I thought it was not only provocative, it can also be damaging. The idea of working without estimates seems preposterous to many people. It did to me.   I mean, how can you plan anything without estimates? How ...

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The Simple Story Paradox

I’ve recently been following the #isTDDDead debate between Kent Beck (@kentbeck), David Heinemeier Hansson (@dhh), and Martin Fowler (@martinfowler) with some interest. I think that it’s particularly beneficial that ideas, which are often taken for granted, can be challenged in a constructive manner. That way you can figure out if they stand up to scrutiny or fall down flat on ...

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gonsole weeks: content assist for git commands

While Eclipse ships with a comprehensive Git tool, it seems that for certain tasks many developers switch to the command line. This gave Frank and me the idea, to start an open source project to provide a git console integration for the IDE. What happened so far during the gonsole weeks can be read in git init gonsole and eclipse ...

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Spring Professional Study Notes

spring-interview-questions-answers

Before we get down to my own additions to existing resources mentioned in my certification guide post I would like to reiterate all resources that I used for my preparation: Course-ware Spring in Action, Third Edition by Craig Walls Jeanne’s study notes Spring Framework Reference Documentation     Bean life-cycle Bean initialization process One of the key areas of the certification is ...

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5 tips to improve performance in Android applications

If your application has many time-intensive operations, here are some tricks to improve the performance and provide a better experience for your users.                   Operations that can take a long time should run on their own thread and not in the main (UI) thread. If an operation takes too long while it ...

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MongoDB and Grails

So recently, I had a requirement to store unstructured JSON data that was coming back from a web service. The web service was returning back various soccer teams from around the world. Amongst the data contained in most of the soccer teams was a list of soccer players, who were part of the team. Some of the teams had 12 ...

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How to increase productivity

Unlocking productivity is one of the biggest concerns for any person with a management role. However, people rarely agree on the best approaches to improve performance. Over the years, I have observed different managers using opposite practices to churn out the best performance of the team they are managing. Unfortunately, some of them work and others don’t. To be more ...

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Lambda Expressions and Stream API: basic examples

This blog post contains a list of basic Lambda expressions and Stream API examples I used in a live coding presentation I gave in June 2014 at Java User Group – Politechnica Gedanensis (Technical University of Gdańsk) and at Goyello. Lambda Expressions Syntax The most common example:     Runnable runnable = () -> System.out.println("Hello!"); Thread t = new Thread(runnable); ...

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