Vaadin on JAVAPRO International

Open-Core with Core Java and Vaadin — Part 2

Sat, 23 May 2026 11:33:42 +0000

Editions, runtime, and quality assurance.

All source code presented here is published on GitHub and available at https://3g3.eu/naityh.

Recap of part one

The first part of this article developed the abstract mechanics of the open-core application. From two independent Maven projects with strictly asymmetric dependency direction, a deliberately slim extension API with the contribution types RouteContribution, MenuContribution, NavbarContribution, and CounterEventListener, a FeatureRegistry that discovers its contributions via the Java standard library’s ServiceLoader, and a Vaadin integration consisting of MainLayout and OpenCoreRouteInitializer, an apparatus is now in place that can accept arbitrary contributions in ordered form, without the core needing to know their identity.

Open-Core with Core Java and Vaadin — Part 1

Fri, 22 May 2026 11:33:04 +0000

Architecture, extension API, and Vaadin integration.

1. Introduction and motivation

The open-core model is often reduced in discussion to questions of licensing or commercial positioning. An open-source variant of a piece of software is complemented by a commercially distributed variant that brings additional features. Anyone who actually wants to implement such a separation in an existing codebase quickly discovers that the real difficulty lies neither in the licence text nor in the choice of repository, but in the code’s architecture.

Vaadin + Quarkus: The New Approach for Enterprise Apps

Tue, 19 May 2026 07:00:01 +0000

While Vaadin is commonly integrated with Spring, this article explores a powerful new full-stack solution: Vaadin with Quarkus. Quarkus provides a lightning-fast runtime and native images, complementing Vaadin’s Java-first UI, which eliminates JavaScript complexity. Readers will learn how to build scalable, reactive Vaadin Flow apps on Quarkus, covering simplified backend development, enhanced productivity with a unified Java stack, and superior deployment optimization compared to traditional approaches.

Introduction

Vaadin and Quarkus are both modern Java frameworks, each excelling in its domain: Vaadin for building rich web UIs in pure Java, and Quarkus for creating cloud-native, container-first Java applications. Together, they offer a compelling alternative to traditional full-stack Java development, especially for enterprise applications.

Apache Causeway - GOING FURTHER

Thu, 01 Jan 2026 07:00:01 +0000

In this article we’ll continue our exploration of the Apache Causeway, a Spring Boot framework for domain-driven apps following the naked objects pattern. Our focus this time is the framework’s support for validation, on testing, and we’ll also look at some additional UI hints.

Apache Causeway - An Introduction

Tue, 30 Sep 2025 07:00:01 +0000

In this article we explore key concepts of the Apache Causeway framework, learning how it surfaces domain logic directly in the UI, with minimal boilerplate. You’ll gain a practical understanding of how Causeway supports rapid prototyping and domain-driven development.

Exploring XDEV SSE: Enhancing Spring Security for Modern Applications

Fri, 25 Jul 2025 07:00:01 +0000

In the ever-evolving world of web application security, keeping up with best practices is crucial. XDEV’s Extras for Spring Security (XDEV SSE) addresses common challenges developers face when securing distributed systems. This open-source enhancement for Spring Security offers a suite of features to simplify secure application development.

Overview

The extension provides several modules that make managing security in Spring-based applications more straightforward. Its main focus lies on improving OAuth2/OIDC management, session handling, and login persistence, while also simplifying integration with modern frontends. One key benefit is more efficient handling of user sessions through automatic access validation—even after server restarts, security is maintained across all applications.

Local AI with Java: AI Integration Without Cloud Dependency

Fri, 02 May 2025 07:00:03 +0000

The future of artificial intelligence is local. Increasingly, companies are turning to local AI models to ensure data privacy, offline capabilities, and independence from cloud providers. At JCON EUROPE 2025, the two-hour “AI-based optimization in expedition planning – a practice-oriented workshop” with Sven Ruppert will demonstrate exactly how to implement this in Java: high-performance, privacy-friendly AI features – directly in your own application, entirely without cloud services.

Focus on the Open-Source Project “Expedition Planner”

At the center is the open-source project “Expedition Planner”, a Java-based web application designed for planning and organizing expeditions. However, this isn’t just theory: participants will work on real-world use cases, integrating local AI models with Ollama, utilizing Langchain4j and Retrieval Augmented Generation (RAG) to optimize task planning and equipment lists intelligently.