How to port a java application to the web?

Question

Java

With a very high probability, you will soon have to port a desktop client-server java application to the web. The application is quite extensive, contains many tables and forms with a bunch of checks and dependencies between fields. There are also all sorts of components such as an interactive calendar and planner. In addition, you still need to work with iron (scanner, payment by bank cards).
What framework could be used?

Answer 1

Well, what. Take the framework to your taste, jooby.org, sparkjava or springboot. I was the first fan.
As for that's all that's it. There are also all sorts of components such as an interactive calendar and planner. - I strongly recommend doing this in vuejs or react. And you will have all this in javascript, without any java. And java will only give data via REST/json.
But, damn it, as MaxLich already noted , this is not porting, but writing from scratch!