How do I read XML lists properly from kotlin Classes ```enum

Question

How do I read XML lists properly from kotlin Classes ```enum class Language AmericanEnglish BritishEnglish Japanese French German LatinAmericanSpanish Spanish Italian Dutch CanadianFrench Russian Korean TraditionalChinese SimplifiedChinese Unknown data class TitleName val language Language val name String val publisher String data class NACP val title List lt TitleName gt TODO Add more ``` XML simplified ``` lt xml version= 1 0 encoding= utf 8 gt lt Application gt lt Title gt lt Language gt AmericanEnglish lt Language gt lt Name gt Mario Party Superstars lt Name gt lt Publisher gt Nintendo lt Publisher gt lt Title gt lt Title gt lt Language gt BritishEnglish lt Language gt lt Name gt Mario Party Superstars lt Name gt lt Publisher gt Nintendo lt Publisher gt lt Title gt lt Title gt lt Language gt Japanese lt Language gt lt Name gt ﾃﾞ ﾃﾪ ﾂﾪ ﾃﾑ ﾃﾼ ﾃﾆ ﾂﾣ ﾂﾹ ﾃﾼ ﾃﾑ ﾃﾼ ﾂﾹ ﾂ ﾃﾼ ﾂﾺ lt Name gt lt Publisher gt Nintendo lt Publisher gt lt Title gt lt Application gt ``` Code ```val parser = XmlMapper builder addModule KotlinModule Builder Defaults withReflectionCacheSize 512 configure KotlinFeature NullToEmptyCollection false configure KotlinFeature NullToEmptyMap false configure KotlinFeature NullIsSameAsDefault false configure KotlinFeature SingletonSupport false configure KotlinFeature StrictNullChecks false build Defaults configure MapperFeature ACCEPT CASE INSENSITIVE PROPERTIES true configure DeserializationFeature FAIL ON UNKNOWN PROPERTIES false configure DeserializationFeature FAIL ON NULL FOR PRIMITIVES false configure DeserializationFeature FAIL ON NUMBERS FOR ENUMS false build parser readValue lt NACP gt xml = gt com fasterxml jackson databind exc MismatchedInputException Cannot construct instance of `TitleName` although at least one Creator exists no String argument constructor factory method to deserialize from String value AmericanEnglish ```

dinomite · Answer

Hmm I don t ever use XML but it looks to me like perhaps you need that `val` in `NACP` to be named `application` you could also add ` JsonProperty application `

dinomite · Answer

To see what the parser is expecting build an object in memory i e `val nacp = NACP listOf TitleName ` and then serialize it using the object mapper `parser writeValueAsString nacp `

martmists · Answer

The parser is likely expecting `Contents` to only appear once with a bunch of elements like `item` which have those blocks inside it but this bug should have been fixed about 8 years ago

martmists · Answer

yup ``` lt xml version= 1 0 encoding= UTF 8 gt lt NACP gt lt title gt lt title gt lt language gt AmericanEnglish lt language gt lt name gt English Name lt name gt lt publisher gt Publisher lt publisher gt lt title gt lt title gt lt language gt BritishEnglish lt language gt lt name gt British English Name lt name gt lt publisher gt Publisher lt publisher gt lt title gt lt title gt lt language gt Dutch lt language gt lt name gt Dutch Name lt name gt lt publisher gt Publisher lt publisher gt lt title gt lt title gt lt NACP gt ```

dinomite · Answer

Hmm I d be surprised for such a glaring bug to persist in Jackson perhaps it s just a conceptual misunderstanding

dinomite · Answer

In JSON I d expect your object to look like ``` title language AmericanEnglish name Mario Party Superstars publisher Nintendo ```

dinomite · Answer

So what you have above <https kotlinlang slack com archives C0BLHCSHZ p1635709970004500 thread ts=1635704610 002700 amp cid=C0BLHCSHZ> makes sense to me because XML doesn t have a list type