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spring-framework/spring-core
김준형 af466ccf63 Fix OptionalToObjectConverter applicability check
OptionalToObjectConverter.matches() used
TypeDescriptor.getElementTypeDescriptor(), which returns null for an
Optional (element types are only resolved for arrays, streams and
collections). ConversionUtils.canConvertElements() then treats a null
source element type as "maybe" and returns true unconditionally, so
ConversionService.canConvert(Optional<X>, target) reported true even
when X is not convertible to the target -- a violation of the
canConvert contract, since the subsequent conversion fails.

To address that, this commit resolves the Optional's element type from
its generic and checks it against the target, mirroring
ObjectToOptionalConverter. A raw or otherwise unresolved element type
remains permissive.

Closes gh-36913

Signed-off-by: junhyeong9812 <pickjog@gmail.com>
2026-08-20 16:19:37 +02:00
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