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Merge pull request #24620 from friscoMad 

* pr/24620:
  Polish "Remove old documentation relating to yaml and profiles"
  Remove old documentation relating to yaml and profiles

Closes gh-24620
This commit is contained in:
Madhura Bhave 2021-02-17 09:44:07 -08:00
parent dea9b7f085 52a15647a9
commit 34150d01b7
1 changed files with 3 additions and 30 deletions
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33
spring-boot-project/spring-boot-docs/src/docs/asciidoc/spring-boot-features.adoc
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@ -984,8 +984,6 @@ The `SpringApplication` class automatically supports YAML as an alternative to p
NOTE: If you use "`Starters`", SnakeYAML is automatically provided by `spring-boot-starter`.
==== Mapping YAML to Properties
YAML documents need to be converted from their hierarchical format to a flat structure that can be used with the Spring `Environment`.
For example, consider the following YAML document:
@ -1034,6 +1032,9 @@ The preceding example would be transformed into these properties:
TIP: Properties that use the `[index]` notation can be bound to Java `List` or `Set` objects using Spring Boot's `Binder` class.
For more details see the "`<<boot-features-external-config-typesafe-configuration-properties>>`" section below.
WARNING: YAML files cannot be loaded by using the `@PropertySource` or `@TestPropertySource` annotations.
So, in the case that you need to load values that way, you need to use a properties file.
[[boot-features-external-config-loading-yaml]]
@ -1045,34 +1046,6 @@ The `YamlPropertiesFactoryBean` loads YAML as `Properties` and the `YamlMapFacto
You can also use the `YamlPropertySourceLoader` class if you want to load YAML as a Spring `PropertySource`.
[[boot-features-external-config-yaml-shortcomings]]
==== YAML Shortcomings
YAML files cannot be loaded by using the `@PropertySource` annotation.
So, in the case that you need to load values that way, you need to use a properties file.
Using the multi-document YAML syntax in profile-specific YAML files can lead to unexpected behavior.
For example, consider the following config in a file:
.application-dev.yml
[source,yaml,indent=0]
----
server.port: 8000
---
spring.config.activate.on-profile: "!test"
mypassword: "secret"
----
If you run the application with the argument `--spring.profiles.active=dev` you might expect `mypassword` to be set to "`secret`", but this is not the case.
The nested document will be filtered because the main file is named `application-dev.yml`.
It is already considered to be profile-specific, and nested documents will be ignored.
TIP: We recommend that you don't mix profile-specific YAML files and multiple YAML documents.
Stick to using only one of them.
[[boot-features-external-config-random-values]]
=== Configuring Random Values
The `RandomValuePropertySource` is useful for injecting random values (for example, into secrets or test cases).