DynamoDbMapper's schema generation for nullable lists not working

[sb000003]

Describe the bug

Hi,

Unsure if this is intended behavior or not. When i have a data class with a property like this for e.g. val keywords: List<String>? = null it generates a schema that won't compile with the error Inapplicable candidate(s): val keywords: List<String>?.

It seems it doesn't matter what the Type in the list is, it will produce the incorrect schema. Here is what got generated in my specific example.

AttributeDescriptor( "keywords", Player::keywords, PlayerBuilder::keywords::set, ListConverter(StringConverter), )

I think the converter there maybe needs to be NullableConverter(ListConverter(StringConverter)), instead?

Regression Issue

• Select this option if this issue appears to be a regression.

Expected behavior

The generated schema compiles when a nullable list property is included.

Current behavior

An error Inapplicable candidate(s): val keywords: List<String>?

Steps to Reproduce

Have an annotated data class with a nullable list property like e.g. val keywords: List<String>? = null

Possible Solution

No response

Context

No response

AWS SDK for Kotlin version

1.4.61-beta

Platform (JVM/JS/Native)

JVM

Operating system and version

MACOS Sequoia 15.4 (24E248)

[lauzadis]

Thanks for the report, this is not the intended behavior. I found the issue and opened a PR to fix it! #1591

[lauzadis]

The fix for this was released in v1.4.78. Please upgrade, give it another try, and reopen this issue if you have trouble. Thanks!

[github-actions]

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[sb000003]

Thank you @lauzadis. I have this working now