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Simplify property validation sample and document need for static bean method

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Closes gh-6627
This commit is contained in:
Andy Wilkinson
2016-09-20 21:33:22 +01:00
parent 43e020ef7b
commit be33827f49
2 changed files with 23 additions and 25 deletions
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10
spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc
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@@ -1070,9 +1070,13 @@ as `@Valid` to trigger its validation. For example, building upon the above
----
You can also add a custom Spring `Validator` by creating a bean definition called
`configurationPropertiesValidator`. There is a
{github-code}/spring-boot-samples/spring-boot-sample-property-validation[Validation sample]
so you can see how to set things up.
`configurationPropertiesValidator`. The `@Bean` method should be declared `static`. The
configuration properties validator is created very early in the application's lifecycle
and declaring the `@Bean` method as static allows the bean to be created without having to
instantiate the `@Configuration` class. This avoids any problems that may be caused by
early instantiation. There is a
{github-code}/spring-boot-samples/spring-boot-sample-property-validation[property
validation sample] so you can see how to set things up.
TIP: The `spring-boot-actuator` module includes an endpoint that exposes all
`@ConfigurationProperties` beans. Simply point your web browser to `/configprops`