Referenced materials to start Vaadin development

Dear,

I have a Java Applicaiton developed by combining JSP/EJB/Hibernate. I am investigating to revise this application using Vaadin technology, but hope to retain most of the codes. Please advise where I can locate referenced materials to learn how to modify my deployment descriptor, servlet/service programs in order get my application run on Vaadin technology.

Thanks,
Joey

Take a look at this blog post:
https://vaadin.com/blog/-/blogs/migrating-from-jsp-and-jsf-to-vaadin-made-easy

There’s a webinar included that could be useful for you.

Many thanks. It’s really helpful.

Dear,

I need to start my application by loading a custom servlet to do some initialization works, and then invoke a login page/view in the end of that servlet. Please kindly advise where I can have project examples for my references.

Many thanks,
Joey

Is that something you can do in UI init method?