Vaadin Framework Java

In Java, Vaadin Framework is an open-source framework to develop web applications. We can work with JavaScript and AJAX because it comes with support for both of them. By using Google Web Toolkit, we can include the external feature in it. Vaadin framework renders rich data in the browser without taking the help of any markup files, and due to which it is a time saver for the developers. Using the Vaadin framework, with the help of Java features, we can create our front-end. By using the Vaadin framework, the developer can write a user interface without helping client-side web technologies in the Java programming language.

Architecture of the Vaadin Framework

Before setup the environment, let's understand the architecture of the Vaadin framework. The Vaadin framework provides two modules to develop a website. The first module is for the server-side, and the second one is for the client-side.

The given diagram defines the entire runtime environment of the Vaadin framework.

In order to deal with the Vaadin Framework, we should have knowledge of the following points:

• The client-side engine of the Vaadin framework is used for rendering the user action or output.
• The server-side handles the business-based part that receives the event-based request and generates the response for the client. Communication between two levels occurs via the HTTP protocol.
• The Vaadin framework uses the GWT, and due to that, the output of the Vaadin application renders faster and increases the scalability. So, the Vaadin framework has higher scalability than the conventional JavaScript-based application.
• The Vaadin is faster than the XML-based application because of using JSON.
• Separate components such as CSS and themes can be used to provide amazing customer-side feedback.
• In order to connect and manipulate data, the Vaadin framework has data binding modules that provide APIs.

Setup Environment

In order to use the Vaadin, we first have to set up the framework, and for that, we use the following steps:

Step 1:

We should have JDK 8 or a newer version in our local development environment because Vaadin uses JVM. We set the environment variables for JAVA to work it properly. In order to check whether the JDK 8 is installed properly or not in Windows operating system, run the java-version in the command prompt. If, as an output, it shows the java version, the JDK is successfully installed in the system.

Step 2:

In the next step, we install the IDE available online. These are the following IDEs that we can use for the Vaadin framework:

1. Netbean
2. Eclipse
3. Intellij

We have to make sure that the IDE which we use should have the latest version.

Step 3:

As an application server, we use the Tomcat. We configure the Tomcat server in our system to use Vaadin. If we install the latest version of Netbean, there is no need to install the Apache Tomcat because Netbean automatically installs it in our system. If we use Eclipse or Intellij, we should have to install the Apache Tomcat from its official website, i.e., https://tomcat.apache.org/.

Step 4:

For our application, the internet browser will act as the client. So, we can use any of the modern internet browsers like Chrome, Safari, etc.

Step 5:

In the end, we configure the Eclipse. We type the Vaadin in the search bar of the eclipse marketplace. We install it by click on the install button as shown below.

Create First Application

Let's understand how we can create a web application using the Vaadin framework by simply taking an example.

We use the following steps to create the first Vaadin application using Eclipse IDE:

1) We first go to the File menu and click on the New and then click on the Other just like as:

2) Now, type Vaadin in the search bar. Select Vaadin 8 project and click on the Next

3) After clicking on the Next button, a new window opens with four options, i.e., Single-module Application Project, Multi-module Application Project, Add-on Project, and CRUD Example. Select an option that is best suited for you and go to the next step.

4) After clicking on the Next button, a new window will be open to provide the Group and Artifact ID. We click on the Finish button after fill all the information in the required fields. The finish button finishes the project, and Eclipse creates Vaadin for us.

It takes some time to create an application because it requires the configuration setting.

5) Now, we go to the directory structure of the automated Vaadin project like as:

6) Our first Vaadin application is ready to run. We run the project on any of the application servers. After running the application on the server, we see the output like as:

7) Enter any value in the text box and click on the Show Data button. This click reflects the value of the text box below the button.