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Add explanation for @Valid container parameters in ann-validation.adoc #35186

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Add explanation for @Valid container parameters in ann-validation.adoc #35186

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7 changes: 7 additions & 0 deletions framework-docs/modules/ROOT/pages/web/webmvc/mvc-controller/ann-validation.adoc
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Expand Up @@ -20,6 +20,13 @@ directly on method parameters, or on the method (for the return value), then met
validation must be applied, and that supersedes validation at the method argument level
because method validation covers both method parameter constraints and nested constraints
via `@Valid`. The exception raised in this case is `HandlerMethodValidationException`.
+
Container parameters annotated with `@Valid`—for example,
`@RequestBody List<Foo> items` or `@RequestBody @Valid List<@Valid Foo> items`—are
likewise subject to method validation. They are detected by
`HandlerMethod.MethodValidationInitializer.checkArguments(…)`, and any
resulting constraint violations cause a `HandlerMethodValidationException`
to be raised.

Applications must handle both `MethodArgumentNotValidException` and
`HandlerMethodValidationException` as either may be raised depending on the controller
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