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Exclude Part from nested constructor binding in WebFlux #31778

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Exclude Part from nested constructor binding in WebFlux #31778

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HeartPattern
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Related to: #31669 and 9ade52d

WebFlux has same issue with nullable multipart file handling. MultipartFile and Part should be excluded from nested constructor binding in WebExchangeDataBinder.

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@spring-projects-issues spring-projects-issues added the status: waiting-for-triage An issue we've not yet triaged or decided on label Dec 7, 2023
sbrannen
sbrannen requested changes Dec 8, 2023
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Can you please introduce a test that fails before the change and passes after the change?

@sbrannen sbrannen added status: waiting-for-feedback We need additional information before we can continue in: web Issues in web modules (web, webmvc, webflux, websocket) labels Dec 8, 2023
@sbrannen sbrannen changed the title Exclude Part and MultipartFile from nested constructor binding on WebFlux Exclude Part and MultipartFile from nested constructor binding on WebFlux Dec 8, 2023
@sbrannen sbrannen mentioned this pull request Dec 8, 2023
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@sbrannen sbrannen changed the title Exclude Part and MultipartFile from nested constructor binding on WebFlux Exclude Part and MultipartFile from nested constructor binding in WebFlux Dec 8, 2023
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HeartPattern commented Dec 9, 2023 •
edited

However, it seems like Part and FilePart is not the only problem. Any other nullable types is not bind properly through constructor after ea398d7. For example, in kotlin

data class MyBean(
  val anotherBean: AnotherBean?,
)

Maybe checking param.isOptional() == false before shouldConstructArgument() is proper fix for this issue.

@spring-projects-issues spring-projects-issues added status: feedback-provided Feedback has been provided and removed status: waiting-for-feedback We need additional information before we can continue labels Dec 9, 2023
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sbrannen commented Dec 9, 2023

However, it seems like Part and FilePart is not the only problem. Any other nullable types is not bind properly through constructor after ea398d7. For example, in kotlin

@HeartPattern, can you please create a separate issue to discuss that?

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Open another PR addressing that problem.
#31800

@sbrannen sbrannen added type: regression A bug that is also a regression and removed status: waiting-for-triage An issue we've not yet triaged or decided on status: feedback-provided Feedback has been provided labels Dec 11, 2023
@sbrannen sbrannen added this to the 6.1.2 milestone Dec 11, 2023
rstoyanchev
rstoyanchev reviewed Dec 12, 2023
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spring-web/src/main/java/org/springframework/web/bind/support/WebExchangeDataBinder.java
Class<?> type = param.nestedIfOptional().getNestedParameterType();
return (super.shouldConstructArgument(param) &&
!MultipartFile.class.isAssignableFrom(type) && !Part.class.isAssignableFrom(type));
}
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This is a necessary change indeed for Part but MultipartFile is not used in WebFlux, so we can leave that out.

@rstoyanchev rstoyanchev self-assigned this Dec 12, 2023
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I'm processing this locally as we are close to the 6.1.2 release. No need send further updates.

rstoyanchev pushed a commit that referenced this pull request Dec 12, 2023
@HeartPattern @rstoyanchev
Exclude Part from nested constructor binding in WebFlux
4d838c1 
See gh-31778
@rstoyanchev rstoyanchev changed the title Exclude Part and MultipartFile from nested constructor binding in WebFlux Exclude Part from nested constructor binding in WebFlux Dec 12, 2023
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in: web Issues in web modules (web, webmvc, webflux, websocket) type: regression A bug that is also a regression
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