Java

Quarkus Banner: Build Your First FIGlet Startup Banner

Add two-color ASCII art to a small REST application, preview fonts in Dev UI, and test the packaged result.

4 hrs ago • Markus Eisele

Quarkus HTTP Problem: Standardize API Errors Without Three Mappers

See how the platform extension handles common failures, keeps domain problem types explicit, and exposes the mapper pipeline in Dev UI.

Sep 8 • Markus Eisele

Parse Large Excel Files Without Filling Your Agent's Context

Build a streaming Java and JBang tool that lets IBM Bob audit a 44 MB XLSX workbook using four exact evidence rows.

Aug 29 • Markus Eisele

Build Your First Clustered WildFly Bootable JAR

Package a Jakarta EE app, deploy two Kubernetes pods, and verify that the same HTTP session works on both.

Aug 27 • Markus Eisele

Rename a PostgreSQL Column Safely with Quarkus and Flyway

Build a small customer API and learn how expand-contract migrations keep old and new application versions working during a rollout.

Aug 25 • Markus Eisele

Flamme in Practice: Can Quarkus Topology Become a Runtime Decision?

A hands-on adoption check of runtime placement and replica behavior, including what happens when a component or the broker fails.

Aug 21 • Markus Eisele

Migrate Quarkus Feature Flags to OpenFeature

Keep the existing quarkus-flags API, move one key to flagd, and define safe behavior when the provider is unavailable.

Aug 17 • Markus Eisele

Patch a Java Library Method with Quarkus Shim

Build a small Quarkus service, replace one fictional SDK method, and prove the patched and unpatched behavior with tests.

Aug 13 • Markus Eisele

Build Your First Type-Safe Database Queries with Quarkus Qubit

Create a small REST API and learn how Qubit turns Java lambdas into JPA Criteria queries during the Quarkus build.

Aug 9 • Markus Eisele

Stop Duplicate Checkout Work at the HTTP Boundary

A practical Quarkus pattern for safer retries, with the storage, crash, and multi-replica limits made explicit.

Aug 5 • Markus Eisele

A Smaller Core for Broader AI-Enabled Products

Separate durable business rules from generated workflows so product scope can grow without operational risk growing at the same rate.

Aug 3 • Markus Eisele

Your First Open Liberty Application with Maven

Start with an empty folder and build, test, hot-reload, and package a small Jakarta REST application with Maven.

Aug 1 • Markus Eisele

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