HelloWorld - Vaadin - Ramp up in a second.

A nano project to start a Vaadin project. Here you will get a project template based on one maven module.

To start the webapp use the following maven command.

mvn clean install tomee:run

All tutorials are available under https://vaadin.com/tutorials

target of this project

The target of this project is a minimal rampup time for a first hello world. Why we need one more HelloWorld? Well, the answer is quite easy. If you have to try something out, or you want to make a small POC to present something, there is no time and budget to create a demo project. You don´t want to copy paste all small things together. Here you will get a HelloWorld-Project that will give you all in a second.

Clone the repo and start editing the class VaadinApp. Nothing more.

Used Servlet container?

Here we are using the Jakarta EE 8 server TomEE as Servlet-Container. http://tomee.apache.org/

The UI itself

The UI itself is has only a few elements. There is only a button you can click. For every click, the counter will be increased. For more information about the routing (@Route(""")), have a look at the orig documentation https://vaadin.com/docs/v10/flow/routing/tutorial-routing-annotation.html

@Route("")
public class VaadinApp extends Composite<Div> implements HasLogger {

  private final Button         btnClickMe   = new Button("click me");
  private final Span           lbClickCount = new Span("0");
  private final VerticalLayout layout       = new VerticalLayout(btnClickMe, lbClickCount);

  private int clickcount = 0;

  public VaadinApp() {
    btnClickMe.addClickListener(event -> lbClickCount.setText(valueOf(++clickcount)));

    //set the main Component
    logger().info("setting now the main ui content..");
    getContent().add(layout);

  }
}

Happy Coding.

if you have any questions: ping me on Twitter https://twitter.com/SvenRuppert or via mail.