Development

In most projects I have worked in, Jacoco was used as tool to determine code coverage. The configuration is fairly easy as it plugs into the JVM that runs the tests using an agent that tracks the invocations. In maven, this JVM is forked by the surefire plugin and the parameters are auto generated. The setup is well documented so in this blog post I want to shed some lights on the internals of Jacoco and Sonarqube and how both calculate their coverage metrics. I did some code digging, and I’d like to share my insights. The following information is a compilation of what I found out.

This article is inspired by this question on StackOverflow, which is basically about how Sonarqube and Jacoco calculate coverage.

Mutation-Analysis-Plugin 1.2 released

By Gerald Mücke in development

July 2, 2018

We’re happy to announce the release 1.2 of the Mutation-Analysis Plugin for Sonarqube.

How to write good code

By Gerald Mücke in development

June 27, 2018

A couple of days ago I stumbled over a tweet on Twitter. It contained a list of catchy phrases what makes good writing. Developers also write, but more code than prose texts, so I wondered how applicable this list is to coding as well. So I came up with my own list, which might be a bit less catchy but is hopefully a usefully assembly of good coding practices or guiding principles.

Light Bulb Methods

By Gerald Mücke in development

June 27, 2018

While writing the article on “How to write good code”, I used the term “light bulb methods” and I want to explain bit more in detail, what I meant with this style of method structuring.

Cognito based authentication for CloudFront protected resources

By Gerald Mücke in development

September 21, 2017

Cognito is a relatively new offering proving Identity Management for Apps and Services, including profile management and multi-factor authentication. CloudFront is the Content Delivery Network service provided by Amazon Web Services. CloudFront offers publicly accessible content as well as private content. Private content can be access using either signed URLs or Signed Cookies. Cognito however generates OAuth access tokens. This article describes how to build a service for creating Signed Cookies for Cloudfroint using access control provided by Cognito.

Modular Router Design for Vert.x Microservices

By Gerald Mücke in development

September 15, 2017

When developing micro services with the Vert.x framework I stumbled more than once over the question how to organize Verticles and achieve a modular design. Vert.x is unopinionated allowing various ways of accomplishing this. In this article I’d like to discuss two options for building modular services.

Coding Style for high productivity and lesser bugs

By Gerald Mücke in development

August 4, 2017

In this year’s JCrete unconference I attended a very interesting session about Bugs and Coding style led by Cliff Click (The full discussion can be found here). He started about his experience as a high-performance high-professional coder, about development speed and ratios of bugs in new code, refactored code and bug-fixed code and the implication of this to the code style. Speed of Coding and Rate of Bugs His views and experience are especially interesting as he wrote huge parts of the HotSpot JVM, i.

Building Low-Cost IoT with NodeMCU and Vertx MQTT

By Gerald Mücke in development

July 30, 2017

On this year’s JCrete conference I learned during the hackday about the NodeMCU board, which is an impressive low-cost alternative to an Arduino. It uses the 80 MHz ESP8266 chip that includes WiFi support out of the box. In this article I’d like to describe how to make a simple temperature and pressure sensor device that publishes data via MQTT to a handler implemented using the reactive Vert.x framework. The hardware for the solution costs no more than $15.

Multi-Module Integration Test Coverage with Jacoco and Sonar

By Gerald Mücke in development

May 29, 2015

In this article I describe how to setup jacoco for Maven multi-module projects so that integration test coverage can be calculated for the entire code base and analyzed using Sonarqube.

Mutation Testing

By Gerald Mücke in development

May 29, 2015

End of January I attended the OOP2015 conference in Munich. Among the load of interesting sessions was one that left a mark. It was the workshop conducted by Filip van Laenen and Markus Schirp about Mutation Testing (slides here), which I’d like to summarize in this post.

Coverage with Jacoco and Sonarqube

Mutation-Analysis-Plugin 1.2 released

How to write good code

Light Bulb Methods

Cognito based authentication for CloudFront protected resources

Modular Router Design for Vert.x Microservices

Coding Style for high productivity and lesser bugs

Building Low-Cost IoT with NodeMCU and Vertx MQTT

Multi-Module Integration Test Coverage with Jacoco and Sonar

Mutation Testing

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