Vaadin Interview Questions

Vaadin Interview Questions | Freshers & Experienced

  • Sharad Jaiswal
  • 15th Dec, 2021
  • 778 Followers

About Vaadin

Vaadin is an open-source online application program that also includes Java as one of the basic frameworks. It contains a complete set of all the components, tools, and applications including for the Java users who need to implement the source codes which are made in Java language. It operates with the implementation of HTML5 based user interface.

Key Features of Vaadin

Below are few major features of Vaadin

Modern Java API

Mobile-first components

Declarative HTML templates

Faster and easier app Devlopment

Extensibility

Easy Routing

Supports Data Binding

Custom servlets supported

Built-in themes

Vaadin Interview Questions & Answers

Q1. What is Vaadin framework?

Vaadin framework is an open-source platform for java web application development that includes a Java web framework, a set of web components, and a set of tools and application starters. It allows the implementation of HTML5 web user interfaces by making the use of the Java Programming Language. Vaadin framework is designed to make the creation and maintenance of high-quality web-based user interfaces easy.

Q2. List few features of Vaadin?

Some of the important features of Vaadin are as follows:

  • BeforeEnter, AfterNavigation, and BeforeLeave events.
  • Postpone navigation until a condition is met.
  • Dynamic rerouting and forwarding.
  • Back button and deep linking support.
  • Navigation without reloading the whole page.
  • Registering static routes with @Route annotation.
  • Registering routes dynamically.

Q3. What is Vaadin Flow?

Vaadin Flow is a new Java web framework that is used for building modern web apps and websites, introduced with the Vaadin 10 version. 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 and it also allows the 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.

Q4. What add-ons are available in Vaadin?

There are currently over a hundred and eighty add-ons available in Vaadin, which can be divided into the categories mentioned below:

UI components – These add new functionality to your user interfaces

Data components – They interface various data sources to Vaadin components

Themes – These add a fresh look to your application

Miscellaneous – This comprises everything else.

 

Q5. what is vaadin used for?

Vaadin is used for java web application development that includes a Java web framework, a set of web components, and a set of tools and application starters. It allows the implementation of HTML5 web user interfaces by making the use of the Java Programming Language. Vaadin framework is designed to make the creation and maintenance of high-quality web-based user interfaces easy.

Q6. What are Vaadin components?

Vaadin components are built on the Web Components standard for JavaScript and HTML developers. It is built on Google’s Polymer Vaadin Elements ads enterprise-grade components such as a high-performing data grid and charts. Vaadin has a comprehensive set of beautifully crafted, high-performance, and adaptable UI components for modern mobile-first web apps. They are the ideal building blocks for Progressive Web Applications.

Q7. How to install a component in Vaadin?

The Vaadin components can be installed with npm or Bower. For example, the following command installs the vaadin-button component: bower install vaadin/vaadin-button.

Q8. Is vaadin a MVC?

No Vaadin is not MVC.Vaadin also isn't based on MVP – the pattern is used in many enterprise application projects with Vaadin.

Q9. How to set width of ListBox with Java in Vaadin?

To set the width and height of a ListBox, you can use the following syntax - listbox.getElement().getStyle().set("width", "155px"); You can use an alternate method i.e. by making your own Class which you then use instead of ListBox:

public class SizedListBox extends ListBox implements HasSize {
    public SizedListBox(){
        super();
    }
}
SizedListBox lbRequests = new SizedListBox<>();
lbRequests.setWidth("100%"); 

Q10. What is Vertical or horizontal layoutin Vaadin Flow?

VerticalLayout and HorizontalLayout are ordered layouts for laying components out either vertically or horizontally, respectively. These are the two most important layout components in Vaadin which are extended from AbstractOrderedLayout, together with the FormLayout.The use of the layouts goes as follows:

VerticalLayout vertical = new VerticalLayout ();
vertical.addComponent(new TextField("Name"));
vertical.addComponent(new TextField("Street address"));
vertical.addComponent(new TextField("Postal code"));
layout.addComponent(vertical);

Q11. How to bind a foreign key in Vaadin?

In order to bind a foreign key in Vaadin, you can use the binding filter provided by the Vaadin framework. It provides the proper requisites for binding the foreign key.

Q12. What is the difference between Maven and Vaadin?

The difference between Maven and Vaadin can be stated as Vaadin is used for java web application development that includes a Java web framework, a set of web components, and a set of tools and application starters. It allows the implementation of HTML5 web user interfaces by making the use of the Java Programming Language. Whereas Maven is a build automation tool used primarily for Java projects. Maven can also be used to build and manage projects written in C#, Ruby, Scala, and other languages.

Q13. What are pros and cons of using Vaadin?

The pros and cons of using Vaadin are as follows:

Advantage -

  • Server-side programming
  • Offers multiple options
  • Entirely object-oriented
  • Easy to learn and integrate

Disadvantages -

  • Difficult to find skilled personnel
  • Size of Java Script file
  • No fancy User Interface
  • Scalability

 

About Author :

  • Author of Vaadin Interview Questions

    Sharad Jaiswal

    My name is Sharad Jaiswal, and I am the founder of Conax web Solutions. My tech stacks are PHP, NodeJS, Angular, React. I love to write technical articles and programming blogs.

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