Vaadin Interview Questions
1) What is Vaadin?
Vaadin is an open-source web development framework.
2) What are the components in Vaadin?
Components in Vaadin are defined as a constituent or constituting part of Vaadin framework.
The component hierarchy of Vaadin are as follows:
-Basic Components
-Field Components
-Selection Components
-Layouts and Component Containers
3) What are Add-ons in Vaadin?
Add-ons are the most convenient way to reuse Vaadin code, either commercially or free. Vaadin Directory serves as the store for the add-ons. You can distribute add-ons both as JAR libraries and Zip packages.
4) Enlist major features of Vaadin?
Major features of Vaadin are listed below:
-Web Components
-Java Web Development
-Theming
-Routing
-Spring Support
-Java EE Support
-Data Binding
-HTML Templates
-Extensibility
-Security
-Java, Servers and Tools
-Browsers and End-User OS
-Spring integration
-Look and feel customization
-Router
5) List some advantages and disadvantages of Vaadin?
Vaadin offers the following advantages to its developers:
-Server side programming
-Offers multiple options
-Entirely object oriented
-Easy to learn and integrate
Vaadin offers the following disadvantages to its developers:
-Difficult to find skilled personnel
-Size of Java Script file
-No fancy User Interface
-Scalability
6) What is Vaadin Designer?
Vaadin Designer is a visual WYSIWYG tool for creating Vaadin UIs and views by using drag&drop and direct manipulation. With features such as live external preview and a strong connection between the clean declarative format and the Java code, it allows you to design and layout your UIs with speed and confidence.
7) What are Variants in Vaadin?
Variants in Vaadin are opt-in features of each theme that affect the visual presentation of components.
For instance, light and dark modes, density presets (compact, small, large), and visual prominence (primary, tertiary, no-borders) etc
8) What is Lumo?
LUMO stands for lowest unoccupied molecular orbital. The energy difference between the HOMO and LUMO is termed the HOMO-LUMO gap. HOMO and LUMO are sometimes referred to as frontier orbitals. Each molecular orbital has a calculated energy level.
9) What is Collaboration Engine?
Collaborative search engines (CSE) are Web search engines and enterprise searches within company intranets that let users combine their efforts in information retrieval (IR) activities, share information resources collaboratively using knowledge tags, and allow experts to guide less experienced people through their searches. Collaboration partners do so by providing query terms, collective tagging, adding comments or opinions, rating search results, and links clicked of former (successful) IR activities to users having the same or a related information need.
10) How would you provide an overview of the Vaadin architecture?
Vaadin consists of a server-side framework and a client-side engine. A developer creates the UI using the components, and Vaadin takes care of sending the UI state to the browser and rendering it there. The client-side engine captures user interaction and sends it to the server as needed. User interaction is can be reacted to by registering event listeners for the components. This makes it easy to separate the user interface from the business logic.
11) What is Vaadin Flow?
Vaadin Flow is a new Java web framework for building modern web apps and websites, which was introduced with the versionVaadin 10. It is an important part of the Vaadin Platform and is basically a successor for the Vaadin Framework, which brings Web Component support to Java users. Flow allows developers to be super productive by creating UIs in Java or by using HTML Templates for composing the UI and binding it to any backend using Java. The router is a core concept in Vaadin flow, which also enables navigation for the website or web app.
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