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Document that Spring MVC has own ConversionService
Update documentation to make it clearer that Spring MVC does not use the `ApplicationConversionService` unless configured explicitly. Closes gh-22718
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@ -2271,6 +2271,16 @@ If you want to provide custom instances of `RequestMappingHandlerMapping`, `Requ
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If you want to take complete control of Spring MVC, you can add your own `@Configuration` annotated with `@EnableWebMvc`, or alternatively add your own `@Configuration`-annotated `DelegatingWebMvcConfiguration` as described in the Javadoc of `@EnableWebMvc`.
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[NOTE]
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====
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Spring MVC uses a different `ConversionService` to the one used to convert values from your `application.properties` or `application.yaml` file.
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The means that `Period`, `Duration` and `DataSize` converters are not available and that `@DurationUnit` and `@DataSizeUnit` annotations will be ignored.
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If you want to customize the `ConversionService` used by Spring MVC, you can provide a `WebMvcConfigurer` bean with an `addFormatters` method.
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From this method you can register any converter that you like, or you can delegate to the static methods available on `ApplicationConversionService`.
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====
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[[boot-features-spring-mvc-message-converters]]
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==== HttpMessageConverters
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