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I’m an independent IT consultant and entrepreneur in the Internet and software business. I’m interested in design, enterprise applications, web apps and SaaS products. I design and develop business solutions and applications. I help companies in terms of software quality and knowledge transfer, e.g. with Angular and Spring Boot.

Schematic – A Database Management UI for Spring Boot

Out of my own need for an embedded database management tool for Spring Boot web applications, similar to the H2 Console, but for non-embedded databases, I've created Schematic - a database management UI for Spring Boot. Specifically, for the Workshops.DE Spring Boot course, some time ago we had decided to replace a development-time, embedded H2 database (and the console application that comes with it) with a more realistic (in that it brings our code closer to an assumed dev / prod parity, ... Read more

Just – A Command Line Toolkit for Spring Boot Applications

In December last year, freelance software consultant Maciej Walkowiak, who also is the lead developer of Spring Cloud AWS, released just, a command-line toolkit for developing Spring Boot applications. I've been using just since then and I'm extremely happy with this tool and how it has improved my development experience with Spring Boot. Although Spring Boot already provides a more than decent developer experience - especially when it comes to getting up and running quickly and integrating technologies and data sources - compared ... Read more

Faster Maven Builds With mvnd – A Maven Daemon

Maven is a popular build tool for Java projects. It allows developers to easily manage dependencies, build and test their code, and package it for distribution. However, one downside of Maven is that it can be slow to start up, especially on large projects. This is where the Maven Daemon, or mvnd, comes in. mvnd is a tool that allows Maven to run in the background as a daemon process, rather than as a one-off command. This means that when you run ... Read more

How to publish a Java library to Maven Central – A Complete Guide By Maciej Walkowiak

Freelance software consultant Maciej Walkowiak (of Just and Spring Cloud AWS fame) has recently published this highly useful guide on "How to publish a Java library to Maven Central". While Maven and its main repository Maven Central certainly is a reliable, safe tool with the requisite infrastructure for managing dependencies for Java software projects, it isn't quite as easy to publish new Maven dependencies as it is for example to publish new npm packages. There's a trade-off here of course (as usually is ... Read more

spring-dotenv: Using .env Files With Spring Applications

spring-dotenv, which in turn is based on dotenv-java is a library that enables Spring applications to access and use environment variables from .env files. .env files are a convention that enables us to store environment variables locally per directory / project instead of either doing so system-wide or in an ad-hoc manner (e.g., using the export shell command), thus allowing use to more strictly follow the storing config in the environment principle from The Twelve-Factor App in Spring (Boot) applications. Read more

Testcontainers and Spring Boot From Integration Tests to Local Development – Oleg Šelajev @ Spring I/O 2022

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Spring Boot 3.0 Migration Guide

With Spring Boot 3 having been released two weeks ago, I'd like to explicitly mention the Spring Boot 3.0 migration guide again (also for personal reference and documentation purposes). While migrating to Spring Boot 3.0 in most cases will be a rather straightforward endeavour, it's good to always have clear and concise guidelines at hand to facilitate such an upgrade and to make the migration process more reliable and predictable. Read more

Spring Boot 3 Is Now Available

This week, with Spring Boot 3.0, the long awaited next iteration of Spring Boot has been released. With Spring Boot 3 having been 12 months in the making, GraalVM native image support, which among other aspects allows for much faster application startup times, probably has been the most highly anticipated feature of this next step for Spring Boot. Further new Spring Boot features comprise: a Java 17 baseline improved observability support for Jakarta EE 10 with an EE 9 baseline You can have a look at the ... Read more

Thoughts about layered architecture – Mapping efficiently with SQL by Tim Zöller @ Spring I/O 2022

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Problem Spring Web: A Library for Handling Problems in Spring Web MVC

Problem Spring Web is an implementation of the proposed application/problem+json HTTP API problem details response for Spring Web (im both its MVC and WebFlux flavours). Error responses should be a first-class citizen when it comes to providing REST APIs. These responses often are generated in an ad-hoc, non-standardised fashion, which not only makes handling such responses more difficult and tedious in client applications but also makes for less maintainable software in the back-end software providing the API. Problem Spring Web attempts to ... Read more
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