Spring's DispatcherServlet is responsible for finding and executing a handler and
rendering the view. A handler is first located by matching the request properties. Then the
request will be bound to a handler method, including locating and calling appropriate type
converters. Then the handler itself will be called to construct a ModelAndView. As mentioned
above, the handler is the place for the application to decide whether a request is valid or
should be answered with an error response.
To keep controllers and views separate, it is good practice to return a model representing the
error case instead of generating the error response in the controller itself. For this purpose
the CAE provides the HttpError class and utility methods in
HandlerHelper
to create error models. A default view for
HttpError
will set an appropriate HTTP status code and can be overwritten to generate more sophisticated
error pages. See Section 4.3.1.1, “Building the Model” for details.
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