I used some Java Web App Frameworks before like Struts, Struts2, Spring MVC and Grails. But I would like to study how do they work in principle. Like organization, caching, it’s structure and stuff. You know, just to be aware of what’s happening inside. Do you guys have any material or link to something like that? Really appreciate it.
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For example, Vaadin you could get how it works on this page:
https://vaadin.com/book/-/page/architecture.html
Or like spring-mvc on this page:
http://static.springsource.org/spring/docs/2.0.x/reference/mvc.html
Or maybe struts2 on this one:
http://struts.apache.org/2.x/docs/home.html
Its just find out where the architecture description is documented 😉 A graph as presented on each link that is referred on this answer is really welcome to understand how they basically work.