computer science

Vaadin

Vaadin is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Vaadin rather than just read about it. In short: Vaadin (Finnish pronunciation: [ˈʋɑːdin]) is an open-source web application development platform for Java. Vaadin includes a set of Web Components, a Java web framework, and a set of tools that enable developers to implement modern web graphical user interfaces (GUI) using the Java programming language only (instead of HTML and JavaScript), TypeScript only, or a combination of both.

Key takeaways

Vaadin belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Vaadin to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Vaadin from memory before moving on to harder problems.

Reference excerpt

Vaadin (Finnish pronunciation: [ˈʋɑːdin]) is an open-source web application development platform for Java. Vaadin includes a set of Web Components, a Java web framework, and a set of tools that enable developers to implement modern web graphical user interfaces (GUI) using the Java programming language only (instead of HTML and JavaScript), TypeScript only, or a combination of both.

History Development began as the Millstone web framework in 2000. It was first released as open-source in 2002. Millstone introduced a component-oriented programming model for the web and an Ajax-based client communication and rendering engine. As a result, a large part of Vaadin's server-side API remains compatible with Millstone's Swing-like APIs. In early 2007 the product name was changed to IT Mill Toolkit and version 4 was released. It used a proprietary JavaScript Ajax-implementation for the client-side rendering, which made it rather complicated to implement new widgets. By the end of the year 2007 the proprietary client-side implementation was abandoned and GWT was integrated on top of the server-side components. At the same time, the product license was changed to the open source Apache License 2.0. The first production-ready release of IT Mill Toolkit 5 was made on March 4, 2009, after an over one year beta period. On September 11, 2008, it was publicly announced that Michael Widenius–the main author of the original version of MySQL–invested in IT Mill, the Finnish developer of Vaadin. The size of the investment is undisclosed. On May 20, 2009, IT Mill Toolkit changed its name to Vaadin Framework. The name originates from the Finnish word for doe, more precisely put, a female reindeer. It can also be translated from Finnish as "I insist". In addition to the name change, a pre-release of version 6 along with a community website was launched. Later, IT Mill Ltd, the company behind the open source Vaadin Framework, changed its name to Vaadin Ltd. On March 30, 2010, Vaadin Directory was opened. It added a channel for distributing add-on components to the core Vaadin Framework, both for free or commercially. On launch date, there were 95 add-ons already available for download.

Vaadin Flow (Java API) Vaadin Flow (formerly Vaadin Framework) is a Java web framework for building web applications and websites. Vaadin Flow's programming model allows developers to use Java as the programming language for implementing User Interfaces (UIs) without having to directly use HTML or JavaScript. Vaadin Flow features a server-side architecture which means that most of the UI logic runs securely on the server reducing the exposure to attackers. On the client-side, Vaadin Flow is built on top of Web Component standards. The client/server communication is automatically handled through WebSocket or HTTP with light JSON messages that update both, the UI in the browser and the UI state in the server.

Vaadin Flow's Java API includes classes such as TextField, Button, ComboBox, Grid, and many others that can be configured, styled, and added into layout objects instances of classes such as VerticalLayout, HorizontalLayout, SplitLayout, and others. Behaviour is implemented by adding listeners to events such as clicks, input value changes, and others. Views are created by custom Java classes that implement another UI component (custom or provided by the framework). This view classes are annotated with @Route to expose them to the browser with a specific URL. The following example illustrates these concepts: The following is a screenshot of the previous example:

Hilla (TypeScript API) Hilla (formerly Vaadin Fusion) is a web framework that integrates Spring Boot Java backends with reactive front ends implemented in TypeScript. This combination offers a fully type-safe development platform by combining server-side business logic in Java and type-safety in the client side with the TypeScript programming language. Views are implemented using Lit—a lightweight library for creating Web Components. The following is an example of a basic view implemented with Hilla: Starting in October 2025, Hilla is being discontinued as a stand-alone product and merged into Flow.

Vaadin's UI components Vaadin includes a set of User Interface (UI) components implemented as Web Components. These components include a server-side Java API (Vaadin Flow) but can also be used directly in HTML documents as well. Vaadin's UI components work with mouse and touch events, can be customized with CSS, are compatible with WAI-ARIA, include keyboard and screen readers support, and support right-to-left languages. The following table shows a list of the UI components included in Vaadin:

Certifications Vaadin offers two certification tracks to prove that a developer is proficient with Vaadin Flow:

Certified Vaadin 14 Developer Certified Vaadin 14 Professional To pass the certification, a developer should go through the documentation, follow the training videos, and take an online test. Previous (now unavailable) certifications included:

Vaadin Online Exam for Vaadin 7 Certified Developer Vaadin Online Exam for Vaadin 8 Certified Developer

See also List of rich web application frameworks

References

Further reading Duarte, A. (2021) Practical Vaadin: Developing Web Applications in Java. Apress. Duarte, A. (2018) Data-Centric Applications with Vaadin 8 Archived 2018-04-30 at the Wayback Machine. Packt Publishing. Frankel, N. (2013) Learning Vaadin 7, Second Edition. Packt Publishing.Duarte, A. (2013) Vaadin 7 UI Design by Example: Beginner's Guide. Packt Publishing.Holan, J., & Kvasnovsky, O. (2013) Vaadin 7 Cookbook. Packt Publishing.Taylor C. (2012) Vaadin Recipes. Packt Publishing.Frankel, N. (2011) Learning Vaadin. Packt Publishing.Grönroos, M. (2010) Book of Vaadin. Vaadin Ltd.

External links Official website Vaadin on GitHub

Illustrations

Worked examples

Example 1 — a first encounter with Vaadin

Start with the simplest possible case. Write down what Vaadin claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Vaadin before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Vaadin ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Vaadin

In research: Vaadin appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Vaadin in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Vaadin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Java (programming language) libraries, Java enterprise platform, Software developed in Finland, so understanding it makes those chapters shorter.
In everyday life: Look for Vaadin outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Vaadin in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Vaadin means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Vaadin out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Vaadin in simple terms?

Why does Vaadin matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Vaadin?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Vaadin.