Keycloak is an open source identity and access management solution. This article shows how to configure Vaadin and Spring Security to use OAuth2 with Keycloak.

Vaadin has a fantastic Grid component that also can be made editable. But the configuration of the behavior, especially if you want to use the UI with the keyboard, can be complicated. In this blog post, I show you how this can be achieved.

Single-page web applications have today practically become standard. Angular, React, and Vue.js are the best-known representatives in this category of web frameworks. But would this client architecture apply to every use case? Or are there alternatives that would better suit themselves and would be less time- and cost-consuming in development?

The BeanValidationBinder from Vaadin uses the default message bundle ValidationMessages from Bean Validation for translations. But often one has already a resource bundle with translations for the Vaadin application. So how can we override this resource bundle?

In my Vaadin projects, I usually use Karibu Testing for unit and/or Vaadins TestBench for end-to-end tests. Karibu Testing is an open source testing framework developed by Martin Vysny and TestBench the commercial UI testing framework based on Selenium.
Testing with TestBench/Selenium is often slow and flaky. I encountered non-reproducible problems when running the test. So I was looking for an alternative.

Today I tried to deploy a Vaadin application to Google Cloud App Engine
It was not as straightforward as expected so I want to share my findings.

Analyzing and visualizing the message flow between business functions was the goal of my current project. At first, we considered using a UML tool for this job, but we came to the conclusion that it might not be as flexible as we need it to be. Finally, I’ve got the assignment to create a custom web application.

Have you ever had to write an application that didn’t do much other than display and change data? And did you use a Single Page Application framework like Angular, a REST API, and Hibernate?

When using grids, trees, or any other of the multi-valued component with Vaadin you often want to display data from a database table, and typically you have more than a few rows in the database.
In this case loading, thousands or even millions of records don’t make sense and would be a huge performance problem.

No matter if you are using frameworks like JPA, MyBatis or Spring Data JDBC you always end up declaring the SQL statements as a Java String.