Spring Fix adaptation of violations on Set method parameter

Since commit 8552e149b5faae31cab6c7d9d3f0f189904e4a8e, validation of Set values (for example Set<@NotBlank String>) crashes with error : No way to unwrap Iterable without index

With this fix we don't know which value exactly is the problem, but at least we have a working validation

Maybe there is a way to know exactly which value(s) are the culprit, but without an index I don't know how to find it.

Or maybe there is a better way to fix the problem, I trust you'll do a thorough review and find it, I'm not that familiar with the codebase 😄 .

Thanks

This is the error without the fix :

java.lang.IllegalStateException: No way to unwrap Iterable without index
    at org.springframework.util.Assert.state(Assert.java:78)
    at org.springframework.validation.beanvalidation.MethodValidationAdapter.adaptViolations(MethodValidationAdapter.java:358)
    at org.springframework.validation.beanvalidation.MethodValidationAdapter.validateArguments(MethodValidationAdapter.java:247)
    at org.springframework.validation.beanvalidation.MethodValidationAdapterTests.testArgs(MethodValidationAdapterTests.java:237)
    at org.springframework.validation.beanvalidation.MethodValidationAdapterTests.validateValueSetArgument(MethodValidationAdapterTests.java:223)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

Comment From: snussbaumer

I the fix could then be backported to 6.1.x that would be great