Can't find a codec for CodecCacheKey{clazz=interface java.util.List, types=null}.

[TDxushengdong]

Spring Data MongoDb 4.2.4
MongoDb Driver 4.11.1

I use the following code to query mongodb. Although it returns the correct result when querying, why does the underlying source code throw the exception Can't find a codec for CodecCacheKey{clazz=interface java.util.List, types=null}.org.bson.codecs.configuration.CodecConfigurationException Although this exception is caught

interface AccountSettingsRepository : MongoRepository<AccountSettings, String> {
    @Meta(maxExecutionTimeMs = 50)
    @Query(fields = "{'blacklist': 1}")
    fun findByAccountId(accountId: String): AccountSettings?
}

@Document(collection = "accounts")
data class AccountSettings(
    @Id
    val accountId: String,

    @Value("#root.blacklist ?: {}")
    val blacklist: List<String>
)

[christophstrobl]

Thank you for getting in touch. Please do not use images to outline application flow, but take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem.
With things working as expected, and the provided information targeting internal MongoClient API I'm actually inclined to close this ticket. It feels like this is a question that would be better suited to Stack Overflow. We prefer to use GitHub issues only for bugs and enhancements.

[TDxushengdong]

Thanks, Yes, the result is as expected, I'll ask on Stack Overflow.