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I am working to create a UI using Vaadin, now I want to add this to an existing java web app.Do I simply need to add the Vaadin jar file, and the java files of vaadin to that web app?
Or is there some procedure to follow, when doing this?
You need the Vaadin jar, modifications to your web.xml and a file that extends Vaadin's Application class. Check: https://vaadin.com/book/-/page/getting-started.first-project.html