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Mention environment variables mapping in the guide 

Closes gh-2234
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Stephane Nicoll 2014-12-27 18:28:13 +01:00
parent 96d479c3d9
commit 05e402295d
1 changed files with 6 additions and 1 deletions
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7
spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc
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@ -543,13 +543,18 @@ definitions by simply listing the properties classes directly in the
[[boot-features-external-config-relaxed-binding]] [[boot-features-external-config-relaxed-binding]]
==== Relaxed binding ==== Relaxed binding (Properties format)
Spring Boot uses some relaxed rules for binding `Environment` properties to Spring Boot uses some relaxed rules for binding `Environment` properties to
`@ConfigurationProperties` beans, so there doesn't need to be an exact match between `@ConfigurationProperties` beans, so there doesn't need to be an exact match between
the `Environment` property name and the bean property name. Common examples where this the `Environment` property name and the bean property name. Common examples where this
is useful include underscore separated (e.g. `context_path` binds to `contextPath`), and is useful include underscore separated (e.g. `context_path` binds to `contextPath`), and
capitalized (e.g. `PORT` binds to `port`) environment properties. capitalized (e.g. `PORT` binds to `port`) environment properties.
NOTE: Environment variables are usually underscore-separated and upper case so you can
just use that and Spring Boot will bind it to your bean property names accordingly. For
instance `MY_PROPERTY` will match just the same as `myProperty`, `my_property` or
`my-property`.
Spring will attempt to coerce the external application properties to the right type when Spring will attempt to coerce the external application properties to the right type when
it binds to the `@ConfigurationProperties` beans. If you need custom type conversion you it binds to the `@ConfigurationProperties` beans. If you need custom type conversion you
can provide a `ConversionService` bean (with bean id `conversionService`) or custom can provide a `ConversionService` bean (with bean id `conversionService`) or custom