Course Module 5. Spring - Lecture: Specialized types of bins

DispatcherServlet delegates authority to specialized beans so that they process requests and issue appropriate responses. By "specialized beans" we mean Spring-managed Object instances that implement the framework's contracts. They usually come with built-in contracts, but you can customize their properties, extend them, or replace them.

The following table lists the specialized beans discovered by DispatcherServlet:

Bean type	Explanation
`HandlerMapping`	Displays a request for a handler along with a list of interceptors for pre- and post-processing. The mapping is based on some criteria, the details of which depend on the `HandlerMapping` implementation. The two main implementations of `HandlerMapping` are `RequestMappingHandlerMapping` (which supports methods annotated with `@RequestMapping`) and `SimpleUrlHandlerMapping` (which continuously explicitly registers URI path patterns for handlers).
`HandlerAdapter`	Helps `DispatcherServlet` call the handler mapped to the request, regardless of how the handler is actually called. For example, calling an annotated controller requires annotation resolution. The main purpose of the `HandlerAdapter` is to shield the `DispatcherServlet` from such details.
`HandlerExceptionResolver`	A strategy for recognizing exceptions, by possibly mapping them to handlers, presenting errors to HTML, or other targets.
`ViewResolver`	Recognizes logical view names based on the `String` returned by the handler with the actual `View` that will be rendered in the response.
`LocaleResolver`, `LocaleContextResolver`	Recognizes the `Locale` that the client is using, and possibly its time zone, to provide internationalized views.
`ThemeResolver`	Recognizes themes that your web application might use—for example, to offer personalized layouts.
`MultipartResolver`	An abstraction for parsing a multi-part request (for example, uploading a file from a browser form) using some multi-part request parsing library.
`FlashMapManager`	Store and receive an "input" and "output" `FlashMap` that can be used to pass attributes from one request to another, typically via redirection.