Erik Lumme.dev

Every IDE has features that to some are vital for everyday work, but that others are not aware of. Here I list some of my favorite IntelliJ features.

Using a database table to keep track of the next identifiers to assign works in all SQL implementations, but comes at a performance cost. Here we take a look at what Hibernate does to alleviate this issue.

The UI class is central to Vaadin applications, as it holds the state of all active server-side components. This article explains what the UI is, but also when it is instantiated, and when it's discarded.

Whether for multi-tenancy or user preference, the need to dynamically change the theming of an application is a common business application need. In this post, we show how it’s done using CSS custom properties and HTML attributes.

Microsoft recently released a Java API for Playwright, their cross-browser web-automation library. Playwright automatically downloads and updates web drivers, making set-up a breeze and keeping the drivers ever green. In this post, we take a look at how it can be utilized for testing a Vaadin application.

Running Liquibase from Java is useful to ensure a schema is up to date on startup, or to update a schema as part of an integration test.

Vaadin 15 adds the option to enhance your Java application with views written in TypeScript, without the need for a server-side state.

This post will guide you through creating a simple stock tracker application, saving your favorite stocks to the server and using the Financial Modeling Prep API to get up-to-date information about them.

Some things are best kept secret. This goes for data too. In this tutorial, you will learn how to implement a simple access-control system using plain Vaadin and Java.