A Java geek

Beautify third-party API with Kotlin

Scala has popularized the 'Pimp my library' pattern: This is just a fancy expression to refer to the ability to supplement a library using implicit conversions. — Pimp My Library Pattern in Scala Kotlin does provide the same capability. However, it achieves it via extension functions. While the generated bytecode is similar to Java’s static methods, the developer experience is the same as adding functions to existing types. This approach has limitations, though.

Development

Native-image with Quarkus

So far, we have looked at how well Spring Boot and Micronaut integrate GraalVM native image extension. In this post, I’ll focus on Quarkus: A Kubernetes Native Java stack tailored for OpenJDK HotSpot and GraalVM, crafted from the best of breed Java libraries and standards. Creating a new project Just as Spring Boot and Micronaut, Quarkus provides options to create new projects: A dedicated quarkus CLIA Web UI Quarkus offers a definite improvement over its competitors.

Java

Multiple Spring Boot applications in the same project

I frequently use the Spring Boot framework in my demos. The latest one is no different. It shows how to achieve CQRS using two different code paths: the command part is implemented via Spring Data JPAthe query part via jOOQ My use case is a banking application that offers a REST layer allowing clients to call any parts.

Development

Port management in your local Kubernetes cluster

Most of my talks contain a demo. A fair share of these demos require multiple 'infrastructure' dependencies: a database (or more), Elasticsearch, you name it. To ease my setup and avoid stuffing my machine, I use either Docker Compose or Kubernetes locally on my Mac. Both rely on Docker Desktop. To expose a cluster Service on my host, I use nodePort. Hence, I set a dedicated node port for each service. I need to remember each of them for each demo.

Development

Native-image with Micronaut

Last week, I wrote a native web app that queried the Marvel API using Spring Boot. This week, I want to do the same with the Micronaut framework. Creating a new project Micronaut offers two options to create a new project: A web UI: As for Spring Initializr, it provides several features: Preview the project before you download itShare the configurationAn API I do like that you can check the impact that the added features have on the POM.

Development

Native-image with Spring Boot

The Cloud has enabled a lot of new usages that were not possible before. Among them stands Serverless: Serverless computing is a cloud computing execution model in which the cloud provider allocates machine resources on demand, taking care of the servers on behalf of their customers. Serverless computing does not hold resources in volatile memory; computing is rather done in short bursts with the results persisted to storage.

Development

Extending third-party APIs in different languages

The need for shorter and shorter Time-To-Market requires to integrate more and more third-party libraries. There’s no time for the NIH syndrom anymore if it ever was. While most of the time, the library’s API is ready to use, it happens that one needs to 'adapt' it to the codebase sometimes. How easy the adaptation is depends a lot on the language. For example, in the JVM, there are a couple of Reactive-Programming libraries: RxJava, Project Reactor, Mutiny, and coroutines.

Java

A list of cache providers

Last week, we described several criteria to look at to choose a cache. This week, it’s time to list Java cache providers based on these criteria. Java Caching System Guava Caffeine Ehcache Infinispan Coherence Community Edition Ignite Geode Hazelcast Java Caching System JCS is a distributed caching system written in Java. It is intended to speed up applications by providing a means to manage cached data of various dynamic natures.

Java

Choosing a cache

Today, I’d like to provide some help on how to choose a cache solution. I will organize it into two parts: In this post, we will list what features a cache must have and which ones it can optionally provide. Most criteria are general and can be used regardless of the tech stack, while a couple is specific to the JVM.In the second part, I’ll list providers and verify their respective capabilities Why cache? First, let’s bust a common myth.

Nicolas Fränkel's blog