This 2-part article is about going from a traditional MVC-style Spring Boot application written in Java to a modern, functional, reactive Spring Boot application using Kotlin and Coroutines.| iO tech_hub
Following the recent rollout of our new Insights dashboard, Native mode, Self-Hosted Lite version, SSO functionality, and Visual Studio plugin, our Qodana 2025.2 update promises another round of improvements and extensions. Take a look at what we’ve been doing as we focus on providing greater access to code quality and security in your organization, and […]| The JetBrains Blog
K2 is around the corner (RC2 at the time of writing) and if you haven't prepared your project(s) for it, this post'll help cover some of the areas to watch out for.| Zac Sweers
You may know I’m a big fan of OpenTelemetry. I recently finished developing a master class for the YOW! conference at the end of the year. During development, I noticed massive differences in configuration and results across programming languages. Even worse, differences exist across frameworks inside the same programming language. In this post, I want to compare the different zero-code OpenTelemetry approaches on the JVM, covering the most widespread: Spring Boot with Micrometer Tracing| A Java geek
A few weeks ago, Axel Roest published a simple web server comparison, that turned out to not be doing what it was thought to be doing. Figuring that out was a very interesting discussion that warrants a retrospective, to look at which parts were particularly helpful and which not so much. Tangentially, I want to… Read more| Wade Tregaskis
Pattern matching is a major feature in software development. While pattern matching applies in several locations, its current usage is limited to switch case blocks. I want to compare the power of pattern matching across a couple of programming languages I’m familiar with in this post. I assume that every reader is familiar with the switch case syntax inherited from C. In short: The switch clause references a value-returning statementEach case clause sets another statement; if the value| A Java geek
I’ve been eying OpenRewrite for some time, but I haven’t had time to play with it yet. In case you never heard about OpenRewrite, OpenRewrite takes care of refactoring your codebase to newer language, framework, and paradigm versions. OpenRewrite is an open-source automated refactoring ecosystem for source code, enabling developers to effectively eliminate technical debt within their repositories. It consists of an auto-refactoring engine that runs prepackaged, open-source refac| A Java geek
Have you ever struggled to identify which REST API is being tested in your integration tests? In this article, you’ll learn a clean and readable way to call REST APIs within your integration tests. The goal is to make the WHEN section of the test clearly show which API is called and in what context, while hiding all technical details.| blog.allegro.tech
With their keynote that JetBrains intentionally started putting backend developers in the spotlight again. They made big, impactful announcements, both at an ecosystem and language levels and I can't wait to try out all of the new goodies.| Julien's DevRel corner
Junie is one of the best coding agent I've been trying out so far. Very well integrated with IntelliJ, great for Kotlin, and the test first focus makes it quite good at coming out with good results. However, I do miss the capability to only accept part of a solution and it can be very slowwwwww.| Julien's DevRel corner
The Android Runtime (ART) offers a nice memory safety feature when accessing the content of an array. The indices you use are automatically checked against the bounds of the array to prevent unsafe memory accesses. To achieve this, ART generates extra machine instructions to throw an ArrayIndexOutOfBoundsException when the index is invalid. Here is a simple Kotlin example: 1fun scaleZ(values: FloatArray, scale: Float) = values[2] * scale After translation to arm64 assembly, we obtain the foll...| Romain Guy
When generating random numbers for certain use-cases, such as when generating keys / IDs, it’s recommended for the random function to be “cryptographically strong”. Otherwise, attackers could predict random values, enabling serious security vulnerabilities.| Alexandru Nedelcu - Blog
The database schema should be described as code, in your repository. And you should be able to semi-automatically update your database schema on new deployments. Now in Kotlin, with Gradle and Flyway.| Alexandru Nedelcu - Blog
Kotlin Coroutines are usually integrated in Java code via Java’s CompletableFuture, but a tighter integration might be possible with Cats-Effect.| Alexandru Nedelcu - Blog
The marketing for Functional Programming is made of technobabble. Technobabble was used in Star Trek. Those long discussions are what Star Trek was loved for, but technobabble isn’t good for sharing knowledge or advancing our field.| Alexandru Nedelcu - Blog
As Scala developers and fans of the functional programming promoted by Haskell, how do we justify the use of IO to newbies coming from Java? It’s been a fun ride, but the truth is that Java 19 is changing everything.| Alexandru Nedelcu - Blog
The following describes snippets for executing shell commands, in Java, Scala, and Kotlin, using standard functionality. It’s also useful to compare Java vs Scala vs Kotlin for this particular problem.| Alexandru Nedelcu - Blog
Posted by Alex Rebert, Security Foundations, Ben Laurie, Research, Murali Vijayaraghavan, Research and Alex Richardson, Silicon For decades,...| Google Online Security Blog
TL;DR : With Coolify you can host you Kotlin applications in seconds on your own server and benefit from auto deploys, custom domains, preview branches and more. You can see the code here, and access the sample here.| Julien's DevRel corner
In this article we continue diving into TestContainers and Supabase, and run unit tests against a full local self-hosted Supabase.| Julien's DevRel corner
In this article, I'll dive into several methods I've been looking into to unit test a Kotlin application using Supabase and why I finally decided to go for a Docker Compose / Test Containers solution.| Julien's DevRel corner
Cheat sheet for using Nimbus JOSE + JWT to create signing keys, generate signed JWTs, and verify JWT signatures. Examples use ES256K and EdDSA (Ed25519)| Scott Brady
Often, when explaining to other devs that Masset uses Kotlin as our primary backend language, I receive inquisitive and questioning faces. “The Android language? On your backend? That seems odd… Have you considered rewriting it in Rust?” 🤨 In response, I’ve often found myself struggling to elaborate what it is that I specifically like about […]| tylerrussell.dev
Reading Time: 24 minutesOften, when explaining to other devs that Masset uses Kotlin as our primary backend language, I receive inquisitive and questioning faces. “The Android language? On your backend? That seems odd… Have you considered rewriting it in Rust?” 🤨 | tylerrussell.dev
In this blog, I share my experience of learning Kotlin, Kafka, and Docker while building a Spring-boot application. Join me on this journey as I explore these technologies and provide insights into my project approach, technology integration, and what i like to call the minimum business logic approach.| iO tech_hub
BlurHash is a compact representation of placeholders for images. A blur hash is encoded as a short string that can be rendered to a bitmap at runtime to display a “blurry” version of the source image. The way it works remind me of how spherical harmonics are used in 3D rendering engines to efficiently encode irradiance. I recently remembered that I had been meaning to look at the Kotlin implementation of BlurHash to see if there was a way to make it faster. I looked up the KMP port and af...| Romain Guy
The purpose of this article is to present how to design, test, and monitor a REST service client. The article includes a repository with clients written in Kotlin using various technologies such as WebClient, RestClient, Ktor Client, Retrofit. It demonstrates how to send and retrieve data from an external service, add a cache layer, and parse the received response into domain objects.| blog.allegro.tech
Leland and I were recently discussing how to best implement a new data structure to speed up a specific aspect of Jetpack Compose. He came up with a great idea, and nerd sniped me in the process. The problem was to efficiently encode the occupancy of an 8x8 grid represented as a Long (each bit representing a cell in the grid). After coming up with the bit twiddling code that quickly “rasterizes” a rectangle into the grid as a bitfield, I found myself thinking about how incredibly helpful ...| www.romainguy.dev
Android Studio is a powerful IDE with a multitude of features that I’ll probably never discover. However, when I do discover a feature of the IDE that I’ve been dreaming about, I get irrationally excited about it (and often times write a blog post such as this one). One feature that really piqued my interest […] View post to subscribe to site newsletter. The post Language Injections in Android Studio / IntelliJ IDEA 💉 appeared first on Rebecca Franks - @riggaroo.| Rebecca Franks – @riggaroo
GitHub offers a way to customize one’s profile by allowing one to create a README in a specific repository, named as your profile, e.g., nfrankel/nfrankel. A couple of years ago, I automated the update of my GitHub profile with up-to-date info: my latest blog posts, my upcoming talks, and the last recorded YouTube talk. I took the time to document how to do it on this blog. At the time, I chose Kotlin scripting because I was proficient enough in Kotlin, but I wanted to learn the scripting| A Java geek
Most people who start using Kotlin are already familiar with Java and its ecosystem. I, on the other hand, am not one of those people and have been looking for easier ways into the Java ecosystem. I found that Kotlin was probably that softer path back. (I wrote Java in …| cat /dev/brain
Some say, CVE-2022-42889 is the new Log4Shell, for which we developed our own tool to enumerate affected hosts back in 2021. Others like Rapid7 argue that it may not be as easy to exploit like Log4Shell. Regardless of the severity and exploitability of this vulnerability, we quickly morphed a clone of our Log4Shell plugin into an open source tool that can detect this vulnerability reasonably well.| Silent Signal Techblog
Log4Shell, formally known as CVE-2021-44228 seems to be the next big vulnerability that affects a huge number of systems, and the affected component, Log4j gets involved in logging untrusted data by design. This results in lots of vulnerable hosts that are hidden in the sense that naive testing won’t find them, as it’s not trivial to know which part of a complex parsing path (potentially involving multiple systems) is vulnerable. We built and released our new open source tool to find thes...| Silent Signal Techblog
Many tools are timeless: a quality screwdriver will work in ten years just as fine as yesterday. Reverse engineering tools, on the other hand need constant maintenance as the technology we try to inspect with them is a moving target. We’ll show you how just a simple exercise in Android reverse engineering resulted in three patches in an already up-to-date tool.| Silent Signal Techblog
An immutable object is an object whose state cannot be modified after it is created. Immutable objects have several desirable properties, of which the two most important ones relevant to this post …| whatheco.de
Suppose you have a list of object instances (Kotlin’s concept for singleton classes) that are logically related to one another and you therefore want to group them together, but also want to …| whatheco.de
Armadillo is the fully featured audio player library Scribd uses to play and download all of its audiobooks and podcasts, which is now open source. It specializes in playing HLS or MP3 content that is broken down into chapters or tracks. It leverages Google’s Exoplayer library for its audio engine. Exoplayer wraps a variety of low level audio and video apis but has few opinions of its own for actually using audio in an Android app.| Scribd Technology
Learn how to create a neat color picker in Android using Kotlin. This step-by-step tutorial guides you through integrating a color picker within an AlertDialog.| John Codeos
Learn to integrate biometric authentication, such as fingerprint or face recognition, into your Android app using Kotlin. Securely verify user identity with this easy-to-follow guide.| John Codeos
In this Jetpack Compose tutorial, you'll learn how to create an expandable list. It's the equivalent of the Expandable RecyclerView that we do in XML.| John Codeos
This tutorial teaches you how to move a view with animation when the keyboard appears or disappears. You can use this feature all the way back to API 21.| John Codeos
This blog shows a way to use the Jetbrains HTTP Client to replace Postman and test third party APIs, share requests and even run them in CI all of that within minutes!| Julien's DevRel corner
I found and fixed a tiny bug in OpenAPI, learnt about the library, jackson and git in the process. In short, get and set methods are visited by Jackson even when they aren't used anywhere in the code! Be careful how you name your methods 🔥| Julien's DevRel corner
Maybe it is Monday and you are pairing to catch up while drinking your morning coffee. When you randomly open the project dependencies file and start wondering why Lombok is there. In this post Guille tell us how to get rid of Lombok!| 10Pines | Blog
Trello Android recently converted from using Gson [https://github.com/google/gson] to Moshi [https://github.com/square/moshi] for handling JSON. It was a bit tricky so I wanted to document the process. (For context, Trello Android primarily parses JSON. We rarely serialize JSON, and thus most of the| Dan Lew Codes
The following code converts an object to JSON and then back again: val adapter = Moshi.Builder().build().adapter(Foo::class.java) val foo = Foo(bar = null) val json = adapter.toJson(foo) val foo2 = adapter.fromJson(json) check(foo == foo2) I think most of us would expect check() to pass, but| Dan Lew Codes
