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Processing

See equivalent in the Reactive stack

The DispatcherServlet processes requests as follows:

The WebApplicationContext is searched for and bound in the request as an attribute that the controller and other elements in the process can use. It is bound by default under the DispatcherServlet.WEB_APPLICATION_CONTEXT_ATTRIBUTE key.
The locale resolver is bound to the request to let elements in the process resolve the locale to use when processing the request (rendering the view, preparing data, and so on). If you do not need locale resolving, you do not need the locale resolver.
The theme resolver is bound to the request to let elements such as views determine which theme to use. If you do not use themes, you can ignore it.
If you specify a multipart file resolver, the request is inspected for multiparts. If multiparts are found, the request is wrapped in a MultipartHttpServletRequest for further processing by other elements in the process. See Multipart Resolver for further information about multipart handling.
An appropriate handler is searched for. If a handler is found, the execution chain associated with the handler (preprocessors, postprocessors, and controllers) is run to prepare a model for rendering. Alternatively, for annotated controllers, the response can be rendered (within the HandlerAdapter) instead of returning a view.
If a model is returned, the view is rendered. If no model is returned (maybe due to a preprocessor or postprocessor intercepting the request, perhaps for security reasons), no view is rendered, because the request could already have been fulfilled.

The HandlerExceptionResolver beans declared in the WebApplicationContext are used to resolve exceptions thrown during request processing. Those exception resolvers allow customizing the logic to address exceptions. See Exceptions for more details.

For HTTP caching support, handlers can use the checkNotModified methods of WebRequest, along with further options for annotated controllers as described in HTTP Caching for Controllers.

You can customize individual DispatcherServlet instances by adding Servlet initialization parameters (init-param elements) to the Servlet declaration in the web.xml file. The following table lists the supported parameters:

Table 1. DispatcherServlet initialization parameters
Parameter	Explanation
`contextClass`	Class that implements `ConfigurableWebApplicationContext`, to be instantiated and locally configured by this Servlet. By default, `XmlWebApplicationContext` is used.
`contextConfigLocation`	String that is passed to the context instance (specified by `contextClass`) to indicate where contexts can be found. The string consists potentially of multiple strings (using a comma as a delimiter) to support multiple contexts. In the case of multiple context locations with beans that are defined twice, the latest location takes precedence.
`namespace`	Namespace of the `WebApplicationContext`. Defaults to `[servlet-name]-servlet`.
`throwExceptionIfNoHandlerFound`	Whether to throw a `NoHandlerFoundException` when no handler was found for a request. The exception can then be caught with a `HandlerExceptionResolver` (for example, by using an `@ExceptionHandler` controller method) and handled as any others. By default, this is set to `false`, in which case the `DispatcherServlet` sets the response status to 404 (NOT_FOUND) without raising an exception. Note that, if default servlet handling is also configured, unresolved requests are always forwarded to the default servlet and a 404 is never raised.