Design Pattern
Advent Calendar - 2025 - Filter & Search – Part 01
With the Vaadin interface described in [Part III], our URL shortener has a fully functional administration console available for the first …
Java
78 articles
EclipseStore
Introduction to the URL‑Shortener Advent Calendar 2025
December 2025 is all about a project that has grown steadily in recent months: the Java-based URL Shortener, an open-source project …
Java
Real-Time in Focus: Server-Sent Events in Core Java without Frameworks
Chapter 1 – Introduction 1.1 Motivation: Real-time communication without polling In modern applications, it is often necessary to provide …
Design Pattern
Core Java - Flow.Processor
Reactive streams address a fundamental problem of modern systems: Producers (sensors, services, user events) deliver data at an …
Design Pattern
How and why to use the classic Observer pattern in Vaadin Flow
1. Introduction and motivation The observer pattern is one of the basic design patterns of software development and is traditionally used to …
Java
Password Security: Why Hashing is Essential
Password security is an often underestimated but critical topic in software development. Databases containing millions of user logins are …
Java
What makes Vaadin components special?
From my experience, Vaadin has always stood out from other Java frameworks. Of course, it enables the creation of modern web UIs, but the …
Java
Part III - WebUI with Vaadin Flow for the URL Shortener
1. Introduction and objectives The first two parts of this series established the theoretical and practical foundations of a URL shortener …
Java
Connecting REST Services with Vaadin Flow in Core Java
1. Introduction Why REST integration in Vaadin applications should not be an afterthought In modern web applications, communication with …
Java
Part II - UrlShortener - first Implementation
1. Introduction to implementation 1.1 Objectives and differentiation from the architectural part The first part of this series focused on …
Java
Short links, clear architecture – A URL shortener in Core Java
A URL shortener seems harmless – but if implemented incorrectly, it opens the door to phishing, enumeration, and data leakage. In this first …
Java
If hashCode() lies and equals() is helpless
A deep look into Java’s HashMap traps – visually demonstrated with Vaadin Flow. The silent danger in the standard library The use of HashMap …