Java

Spring Boot Versions Explorer

SpringDiff lets you compare any two Spring Boot versions side by side — starters, properties, auto-configurations, and release notes in one place.

Spring Boot 4.0 Null Safety: JSpecify Ends a Decade of Fragmentation?

Spring Boot 4.0 adopts JSpecify as its null annotation standard. Find out what changes, why it matters, and how it improves your code with four before/after examples.

Java 26 - the new features

What is coming in Java 26 for developers

Why WordPress bots keep knocking on your Java server

Stop wasting JVM threads on WordPress bots. Here is how to block PHP scanners at the Cloudflare, Nginx, and Spring Security levels to keep your Java logs clean.

Lombok: The Batman of the JRE that saved Java from Boilerplate

Is Lombok a bad citizen or a Superhero?

The Friction Zone: Why mixing Kotlin, Java, Hibernate and Lombok is a technical debt nightmare

Transitioning a legacy Java monolith to Kotlin sounds like a modern developer’s dream, but when that project relies on Hibernate and Lombok, the "100% interoperability" promise quickly unravels. This post explores the deep-rooted architectural conflicts that occur when Kotlin’s opinionated, null-sa…

How to Fix “Port 8080 Already in Use” in Spring Boot (Mac, Linux, Windows)

Learn how to fix the “Port 8080 already in use” error in Spring Boot. Find and kill the process on Mac, Linux, or Windows and prevent future port conflicts.

Spring Boot Multipart Upload: Combining JSON Data and File in One Request

How to handle mixed http requests in Spring

Lombok - Java JDK compatibility matrix

Lombok and JDK compatibility

Learn Java in 15 minutes ... and call us to repair the damages for 12 months :)

The origin of the technical debt

Enum Literals in Hibernate and JPA: A Surprisingly Astonishing Difference

Code review lessons. A simple question about a query challenged the online solutions.

Spring Boot vs Quarkus in 2026

Is Quarkus a real alternative to Spring Boot? How to choose between the two?

Lombok and Java 23 compilation issues

Java 23 Lombok compilation error, how to fix it.

Spring Boot and Hibernate, measure the performances

How to configure hibernate to show execution performances

What are Java Patterns

What are Java patterns

Connect to MinIO using Java

Use MinIO as alternative to AWS S3 and Azure Storage

JPA, Spring and Kotlin: store a list or an array in a column of the database

How to use arrays in JPA using Kotlin

Java 22 notes

What is coming with the new Java release

GitLab: build and distribute your Java application using a Docker image

Java CI/CD pipeline with Gitlab

Java and Docker: setup parameters for speed and memory

Size your JVM for docker to avoid surprises

HttpClient: Example and improvements in Java 21

Java HttpClient example

Spring Boot tests: How to override the properties in your test class

How to define specific properties for a Spring Boot test class

RestControllerAdvice: how to handle exceptions in Spring Boot

Organise and tests the exceptions using ControllerAdvice

How to use Oracle and PostgreSQL scripts and functions in H2 Database using Java

Handle Oracle compatibility while testing with H2 in Java projects, including dialect, SQL differences, and migration-safe practices.