Quarkus

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

FlexGanttFX and Quarkus: Keep the Desktop Lean, Server Authoritative

See how a dock-door planner splits UI rendering from transactional validation, optimistic locking, and conflict recovery at the API boundary.

Sep 6 • Markus Eisele

Shieldstral with Quarkus LangChain4j: Guardrails You Can Measure

Turn product policies into scored controls with explicit outage behavior, observable thresholds, and tests before deployment.

Sep 2 • 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

Build Token Exchange Between Three Quarkus Services

Follow a user token from the order service to inventory and audit, then test why each service rejects a token meant for another audience.

Aug 23 • 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

How to Authorize Stateless MCP Tools with Quarkus

Follow one request through protocol checks, OIDC, OPA, and an argument guardrail before the Java tool method runs.

Aug 19 • 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

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