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Unit Testing exercise with FizzBuzz and Mockito

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I sometimes use FizzBuzz to demonstrate the basics of unit testing to newbies. Although FizzBuzz is really simple problem, it can also be used to demonstrate more advanced unit testing techniques like mocking. The FizzBuzz Kata: “Write a program that prints the numbers from 1 to 100. But for multiples of three print “Fizz” instead of the number and for ...

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Externalizing session state for a Spring-boot application using spring-session

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Spring-session is a very cool new project that aims to provide a simpler way of managing sessions in Java based web applications. One of the features that I explored with spring-session recently was the way it supports externalizing session state without needing to fiddle with the internals of specific web containers like Tomcat or Jetty. To test spring-session I have ...

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A common CXF Request Interceptor for all OSGi Bundles

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I have been working on Apache CXF, Karaf, Felix from path few months and i find all these bundled technologies very interesting to work with. While working on some use cases i have been got into a situation where i need only One Interceptor that should be executed on each HTTP request sent to any of bundles deployed under application ...

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Making Side Projects With New Technologies

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(Captain Obvious mantle on) You are a software engineer and maybe you have a side project – something that you do at home in your spare time. If you don’t, go ahead and have one – no life outside is better than a few more hours of programming. Unwitty jokes aside, having a side project is indeed a very useful ...

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A Tech Lead Paradox: Delivering vs Learning

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Agile Manifesto signatory Jim Highsmith talks about riding paradoxes in his approach to Adaptive Leadership. A leader will find themselves choosing between two solutions or two situations that compete against each other. A leader successfully “rides the paradox” when they adopt an “AND” mindset, instead of an “OR” mindset. Instead of choosing one solution over another, they find a way ...

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Make Stories Small When You Have “Wicked” Problems

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If you read my Three Alternatives to Making Smaller Stories, you noticed one thing. In each of these examples, the problem was in the teams’ ability to show progress and create interim steps. But, what about when you have a “wicked” problem, when you don’t know if you can create the answer? If you are a project manager, you might ...

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Java performance tuning survey results (part II)

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This is a second post in series where we analyze the results of the performance tuning survey conducted in October 2014. If you have not read the first part yet, we recommend to start here. Second part will focus on monitoring Java applications for performance issues. In particular, we try to answer the following questions:           ...

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A Virtual Mesos Cluster with Vagrant and Chef

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This is a republished guest blog post by Ed Ropple. Ed is a platform engineer with Localytics. His ambition is to enable other software developers to be more productive and less error-prone. You can find his original article here. Since starting at Localytics in Februmarch or so, I’ve found myself thrown into a bunch of new-ish stuff. My prior ops ...

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An introduction to REST

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REST, or Representational State Transfer is an architectural style, or more simply, a set of constraints. We will look at the constraints REST imposes for web apps, but some highlights are:               Uniform interfaces: all resources are identified by URIs (think: links) It relies on a stateless, client-server, cacheable communications protocol (think: HTTP). Interaction with resources is ...

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PrimeFaces 5.0 DataTable Column Toggler

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I have had an opportunity to work a bit with the PrimeFaces 5.0 DataTable, and the enhancements are great.  Today, I wanted to show just one of the new features…the DataTable column toggler.  This feature enables one to choose which columns are displayed via a list of checkboxes. To use a column toggler, simply add a commandButton to display picklist ...

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