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Polish Externalized Configuration section
Closes gh-3823
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@ -224,7 +224,9 @@ Spring Boot allows you to externalize your configuration so you can work with th
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application code in different environments. You can use properties files, YAML files,
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environment variables and command-line arguments to externalize configuration. Property
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values can be injected directly into your beans using the `@Value` annotation, accessed
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via Spring's `Environment` abstraction or bound to structured objects.
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via Spring's `Environment` abstraction or
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<<boot-features-external-config-typesafe-configuration-properties,bound to structured objects>>
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via `@ConfigurationProperties`.
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Spring Boot uses a very particular `PropertySource` order that is designed to allow
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sensible overriding of values, properties are considered in the the following order:
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@ -244,7 +246,8 @@ sensible overriding of values, properties are considered in the the following or
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variants).
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. Application properties packaged inside your jar (`application.properties` and YAML
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variants).
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. `@PropertySource` annotations on your `@Configuration` classes.
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. {spring-javadoc}/context/annotation/PropertySource.{dc-ext}[`@PropertySource`] annotations
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on your `@Configuration` classes.
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. Default properties (specified using `SpringApplication.setDefaultProperties`).
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To provide a concrete example, suppose you develop a `@Component` that uses a
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@ -315,7 +318,8 @@ following locations and add them to the Spring `Environment`:
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. A classpath `/config` package
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. The classpath root
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The list is ordered by precedence (locations higher in the list override lower items).
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The list is ordered by precedence (properties defined in locations higher in the list
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override those defined in lower locations).
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NOTE: You can also <<boot-features-external-config-yaml, use YAML ('.yml') files>> as
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an alternative to '.properties'.
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