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 external services is no longer a special function, but an integral part of a service-oriented architecture. Even if Vaadin Flow, as a UI framework, relies on server-side Java logic to achieve a high degree of coherence between view and data models, the need to communicate with systems outside the application quickly arises. These can be simple public APIs—for example, for displaying weather data or currency conversions—as well as internal company services, such as license verification, user management, or connecting to a central ERP system.