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One of the pros of Jetpack Compose (in the rest of the article, I will just call it Compose, for brevity), and generally of declarative UI frameworks, is the capability of defining the UI with the same programming language the rest of the application uses. With Compose, it is not necessary anymore to bridge the UI definitions from XML (e.g. with the [in]famous findViewById), resulting in less context switching between two different environments (XML and Kotlin code)....

One exciting feature of JUnit 4 (and 5 as well, but this post will be focused on JUnit 4) is the possibility of running the same test with different input arguments. That is made possible by a custom test runner called Parameterized, which will inject the provided arguments in the constructor of the test class. Instead, the different arguments must be defined in the companion object of the test class....

A couple of years ago I started working on a pet project to manage personal finances, named MoneyFlow. This project soon became a personal playground for a Kotlin Multiplatform mobile app and in a previous article, I journaled all the steps that lead me to a satisfying (at least for that time) shared app architecture. Choosing the right architecture for a [new] Kotlin Multiplatform, Jetpack Compose and SwiftUI app...

SERIES: Building a backend with Ktor Part 1: Structuring a Ktor project Part 2: How to persist Ktor logs Part 3: How to use an in-memory database for testing on Ktor Part 4: How to handle database migrations with Liquibase on Ktor Part 5: Generate API documentation from Swagger on Ktor Part 6: How to schedule jobs with Quartz on Ktor Part 7: Moving from mobile to backend development with Ktor This article is the final instance of the series of posts dedicated to Ktor where I cover all the topics that made me struggle during development and that were not easy to achieve out of the box....

SERIES: Building a backend with Ktor Part 1: Structuring a Ktor project Part 2: How to persist Ktor logs Part 3: How to use an in-memory database for testing on Ktor Part 4: How to handle database migrations with Liquibase on Ktor Part 5: Generate API documentation from Swagger on Ktor Part 6: How to schedule jobs with Quartz on Ktor Part 7: Moving from mobile to backend development with Ktor Sometimes, on a backend project, there is the need to run one or more tasks periodically, like for system administration, maintenance, backup, syncing content in the background, etc....

SERIES: Building a backend with Ktor Part 1: Structuring a Ktor project Part 2: How to persist Ktor logs Part 3: How to use an in-memory database for testing on Ktor Part 4: How to handle database migrations with Liquibase on Ktor Part 5: Generate API documentation from Swagger on Ktor Part 6: How to schedule jobs with Quartz on Ktor Part 7: Moving from mobile to backend development with Ktor When a backend project exposes some APIs, there should also be a place where the clients of those APIs can see and understand what can be consumed....

SERIES: Building a backend with Ktor Part 1: Structuring a Ktor project Part 2: How to persist Ktor logs Part 3: How to use an in-memory database for testing on Ktor Part 4: How to handle database migrations with Liquibase on Ktor Part 5 Generate API documentation from Swagger on Ktor Part 6: How to schedule jobs with Quartz on Ktor Part 7: Moving from mobile to backend development with Ktor Databases are an important and critical part of backend infrastructures....

A couple of days ago I opened my Kotlin Multiplatform pet project MoneyFlow on a different machine than usual. When I tried to run the app on the iOS simulator on Xcode, the build failed with a very strange error: “The operation couldn’t be completed. Unable to locate a Java Runtime”. This was a very strange issue because the JDK is installed and everything is working on the command line and Android Studio/IntelliJ....

SERIES: Building a backend with Ktor Part 1: Structuring a Ktor project Part 2: How to persist Ktor logs Part 3: How to use an in-memory database for testing on Ktor Part 4: How to handle database migrations with Liquibase on Ktor Part 5 Generate API documentation from Swagger on Ktor Part 6: How to schedule jobs with Quartz on Ktor Part 7: Moving from mobile to backend development with Ktor Usually, in a backend project, there are different instances of the same database: one for production (or more than one, it depends on the architecture), one for staging, and a local one that runs in the development machine....

A few days ago, Kotlin 1.5.30 has been released. One of the features contained in the release is the official support for XCFrameworks on Kotlin Multiplatform. XCFramework is a binary that can contain multiple platform-specific variants (even for iOS and macOS at the same time). It has been introduced by Apple during the WWDC 2019 as a replacement for FatFrameworks. Before Kotlin 1.5.30, an XCFramework could be created only by running the xcrun command that will pack the frameworks for every different required platform into an XCFramework....

When you start integrating Kotlin Multiplatform (I’ll call it KMP in the rest of the article) in an existing project you most likely don’t have a mono-repo structure (and making a refactor to achieve this kind of architecture will not be easy). An example of architecture is the following, with a repository for every platform. To understand how to integrate KMP into existing code, give a look at my previous article: “Introducing Kotlin Multiplatform in an existing project”...

Gitlab CI/CD offers the possibility to create a pipeline, which runs when something changes in the repository. A pipeline consists of one or more stages that run in order and in these stages, for example, it is possible to build the project, run the tests, create the artifacts, etc. For more information about Gitlab CI/CD, I suggest you look over the documentation. These out-of-the-box solutions really simplify the work to be done to have a CI up and running....