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Merge branch '2.2.x' into 2.3.x

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Closes gh-22574
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Andy Wilkinson
2020-07-27 09:59:07 +01:00
parent 6b32e62142 7b3c0a9e09
commit 979aef1f68
1 changed files with 4 additions and 0 deletions
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spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
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@@ -1058,6 +1058,10 @@ You cannot use constructor binding with beans that are created by the regular Sp
TIP: If you have more than one constructor for your class you can also use `@ConstructorBinding` directly on the constructor that should be bound.
NOTE: The use of `java.util.Optional` with `@ConfigurationProperties` is not recommended as it is primarily intended for use as a return type.
As such, it is not well-suited to configuration property injection.
For consistency with properties of other types, if you do declare an `Optional` property and it has no value, `null` rather than an empty `Optional` will be bound.
[[boot-features-external-config-enabling]]