Andy Wilkinson e5906a6b64 Allow HttpMsgConverter to depend on ConvService without creating a cycle ... In an MVC web application, DelegatingWebMvcConfiguration provides the ConversionService while also consuming WebMvcConfigurerAdapters that, among other things, can configure HTTP message converters. Boot's WebMvcConfigurerAdapter, WebMvcAutoConfigurationAdapter, consumes the HttpMessageConverters bean and uses it to configure Spring MVC's HTTP message converters. This can create a bean dependency cycle if an HTTP message converter bean depends, directly or indirectly on the ConversionService. An example of the cycle is: ┌─────┐ | jsonComponentConversionServiceCycle.ThingDeserializer defined in … ↑ ↓ | org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration ↑ ↓ | org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter ↑ ↓ | org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration ↑ ↓ | mappingJackson2HttpMessageConverter defined in class path resource [org/springframework/boot/autoconfigure/web/JacksonHttpMessageConvertersConfiguration$MappingJackson2HttpMessageConverterConfiguration.class] ↑ ↓ | jacksonObjectMapper defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$JacksonObjectMapperConfiguration.class] └─────┘ This commit breaks the cycle by making WebMvcAutoConfigurationAdapter consume HttpMessageConverters lazily. This allows the adapter to be created without triggered instantiation of every HTTP message converter bean and all their dependencies. This allows it to be injected into DelegatingWebMvcConfiguration without triggering an attempt to retrieve the ConversionService. Closes gh-9409		2017-06-07 17:18:09 +01:00
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src	Allow HttpMsgConverter to depend on ConvService without creating a cycle	2017-06-07 17:18:09 +01:00
pom.xml	Next Development Version	2017-04-21 08:32:01 +00:00