Kotlin on Pauls Blog

Eliminate PR Noise with ktfmt

Tue, 21 Apr 2026 00:00:00 +0000

Few things are as frustrating during a code review as seeing a 50-line diff, only to realize that 45 of those lines are just re-ordered imports or adjusted indentation. This is “PR noise”.

In the Kotlin world, ktfmt is one of the best tools to solve this. Developed by Meta, it’s a deterministic formatter that ensures every developer on your team produces the exact same output, regardless of their individual IDE settings.

Creating and releasing an application

Sun, 22 Mar 2026 00:00:00 +0000

Creating and releasing an application

I love sim racing, so I thought it would be an interesting exercise to create an application that makes use of Assetto Corsa Competizione (ACC) telemetry.

The basic operation is this:

The client sends a registration message to ACC
ACC replies and starts sending telemetry messages

This is all done over UDP.

ACC messages

The first step was to create a library that could parse the message byte streams. There is a little bit of documentation in the way of some C# code and a ServerAdminHandbook.pdf that can be found in the ACC installation.

Sharing gradle configuration

Sat, 08 Feb 2025 00:00:00 +0000

Source code for this project is available at https://github.com/prule/gradle-sample

When setting up multimodule gradle projects, we often need to share configuration - such as java toolkit version, plugins, junit platform etc…

Previously I would have used the allprojects or subprojects block to do this, but now we have convention plugins. These are locally defined plugins which contain the configuration we want to share. The submodules can then apply those plugins without needing to copy and paste the configuration - this makes it easy to selectively choose which plugins to apply to which module.

Clean architecture - part 1

Sun, 25 Aug 2024 00:00:00 +0000

Clean architecture - part 1

After porting my template app over to Kotlin, I thought it was time to attempt rewriting from a layered architecture to a ports and adapters/hexagonal architecture.

In the layered version, the usual patterns exist:

The domain models ARE the database entities
- The domain model is compromised, cluttered with persistence concerns and far from clean
Services implement the business logic, manipulating the domain (database entities) and persisting them via the repositories
- Unfortunately the services usually end up being classes with a bunch of methods

Kotlin on Pauls Blog

Eliminate PR Noise with ktfmt

Creating and releasing an application

Creating and releasing an application

ACC messages

Sharing gradle configuration

Sharing gradle configuration between modules

Clean architecture - part 1

Clean architecture - part 1