All Implemented Interfaces and Traits:

ImportBeanDefinitionRegistrar, EnvironmentAware

protected static class GspAutoConfiguration.ReplaceViewResolverRegistrar
extends java.lang.Object
implements ImportBeanDefinitionRegistrar, EnvironmentAware

Makes the GSP view resolver the primary viewResolver for GSP applications by replacing the viewResolver bean (WebMvcAutoConfiguration's ContentNegotiatingViewResolver) with an alias to gspViewResolver.

Removal of WebMvcAutoConfiguration's defaultViewResolver (InternalResourceViewResolver) is handled centrally for every Grails servlet web application by GrailsViewResolverAutoConfiguration (grails-controllers), so it is not repeated here.

Controlled by the spring.gsp.replaceViewResolverBean configuration property.

Also makes it answer to jspViewResolver, the name Grails gives an application's own view resolver: RenderSitemeshTagLib resolves the layout view of <g:applyLayout> through a resolver qualified by that name. That one is an alias only where nothing is registered under the name already - an application serving JSP may well have a resolver of its own there, and an alias would answer in its place without saying so, since it is resolved ahead of a bean definition of the same name.