Vaadin Interview Questions

Vaadin Interview Questions

  • Sanjeet Kumar
  • 16th Jun, 2022

About Vaadin framework

Vaadin Framework is an open-source web application having a server-side architecture that constructs the user interface of web applications as RIA, using Java code only. Vaadin provides a server-side development model for building portlets with rich user interfaces. The framework is sole by allowing all user interface development to be done in Java with no JavaScript, HTML, or XML writing required. Vaadin Framework provides a complete set of user interface components and is extensible with Google Web Toolkit with a large number of add-ons already available. Vaadin supports so many UI components and these can be comprehensive with new GWT components if required, and CSS themes can be applied to results. Vaadin supports JPA container package JAR for database operations.

Vaadin Interview Questions

1) What is Vaadin?

Vaadin is an open source web development framework.

2) What are 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:
  1. Basic Components
  2. Field Components
  3. Selection Components
  4. 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:

  1. Web Components
  2. Java Web Development
  3. Theming
  4. Routing
  5. Spring Support
  6. Java EE Support
  7. Data Binding
  8. HTML Templates
  9. Extensibility
  10. Security
  11. Java, Servers and Tools
  12. Browsers and End-User OS
  13. Spring integration
  14. Look and feel customization
  15. Router

5) List some advantages and disadvantages of Vaadin?

Vaadin offers the following advantages to its developers:

  1. Server side programming
  2. Offers multiple options
  3. Entirely object oriented
  4. Easy to learn and integrate

Vaadin offers the following disadvantages to its developers:

  1. Difficult to find skilled personnel
  2. Size of Java Script file
  3. No fancy User Interface
  4. Scalability

6) List some User Interface components available in Vaadin?

Vaadin provides a comprehensive set of user interface components and allows you to define custom components.

The component are listed below:

Basic Components: Illustrates the inheritance hierarchy of the UI component classes and interfaces not bound directly to business objects.

Field Components: Fields are components that have a value that the user can change through the user interface. 

Selection Components: Components that show a list of data and allow selection

Layouts and Component Containers: Components that can contain other components.

7) 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.

8) What are Variants in Vaadin?

Variants in Vaadin are opt-in features of each theme which 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

9) 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.

10) 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.

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