Spring's DispatcherServlet couldn't dispatch the requests without several elements. One of the most important of them is handler execution chain.
Spring beans, like the ones from JavaBeans, use the scopes. We've already seen two of them, singleton and prototype. It's the right time to discover 3 new scopes.
Have you ever asked you about @Autowired annotation in Spring ? Frequently used to facilitate Dependency Injection, an whole mechanism is hidden under this process.
Previously we approached the idea of Spring validation with annotations. We mentioned several lines about @ModelAttribute annotations. But it's still not sufficient to understand well this concept.
Validation features in Spring are universal. You can use annotation or make your own validator and bind it into the request. This article will focus on the first solution.
Standard way of catching HTTP request in Java's web applications is the use of filters. But they are reserved only for webapps. Spring introduces a new way to do it, more general, called handler interceptors.
Central piece of Spring web application is DispatcherServlet. It's a central point of entry for all incoming requests. But it can't do nothing without another important concept, handlers.
The master piece of Spring web framework architecture is dispatcher servlet. We'll focus on it in this article.
