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Document that Spring MVC has own ConversionService

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Update documentation to make it clearer that Spring MVC does not use the
`ApplicationConversionService` unless configured explicitly.

Closes gh-22718
This commit is contained in:
Phillip Webb 2021-01-30 17:01:44 -08:00
parent 5360ca6500
commit 549d4f7fbe
1 changed files with 10 additions and 0 deletions
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10
spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
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@ -2271,6 +2271,16 @@ If you want to provide custom instances of `RequestMappingHandlerMapping`, `Requ
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`.
[NOTE]
====
Spring MVC uses a different `ConversionService` to the one used to convert values from your `application.properties` or `application.yaml` file.
The means that `Period`, `Duration` and `DataSize` converters are not available and that `@DurationUnit` and `@DataSizeUnit` annotations will be ignored.
If you want to customize the `ConversionService` used by Spring MVC, you can provide a `WebMvcConfigurer` bean with an `addFormatters` method.
From this method you can register any converter that you like, or you can delegate to the static methods available on `ApplicationConversionService`.
====
[[boot-features-spring-mvc-message-converters]]
==== HttpMessageConverters