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Update placeholder docs to mention env vars and default values
See gh-30012
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@ -443,16 +443,16 @@ For example, if a secret named `db.password` is mounted at location `/run/secret
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[[features.external-config.files.property-placeholders]]
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==== Property Placeholders
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The values in `application.properties` and `application.yml` are filtered through the existing `Environment` when they are used, so you can refer back to previously defined values (for example, from System properties).
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The standard `$\{name}` property-placeholder syntax can be used anywhere within a value.
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The values in `application.properties` and `application.yml` are filtered through the existing `Environment` when they are used, so you can refer back to previously defined values (for example, from System properties or environment variables).
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The standard `$\{name:default}` property-placeholder syntax can be used anywhere within a value.
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For example, the following file will set `app.description` to "`MyApp is a Spring Boot application`":
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For example, the following file will set `app.description` to "`MyApp is a Spring Boot application written by john.doe`":
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[source,yaml,indent=0,subs="verbatim",configblocks]
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----
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app:
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name: "MyApp"
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description: "${app.name} is a Spring Boot application"
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description: "${app.name} is a Spring Boot application written by ${USERNAME:john.doe}"
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----
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TIP: You can also use this technique to create "`short`" variants of existing Spring Boot properties.
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