Moshi 1.9.x Cannot serialize Kotlin type
The error message specifically says Please use KotlinJsonAdapter from the moshi-kotlin artifact or use code gen from the moshi-kotlin-codegen artifact
As per the Kotlin part of the readme, you must add the KotlinJsonAdapterFactory if you're not using Moshi's codegen. This was a specific behavior change in Moshi 1.9 as per the blog post about Moshi 1.9.
Moshi.Builder() .add(AbsPlayerConverter) .add(AbsRegionConverter) .add(AbsTournamentConverter) .add(MatchConverter) .add(RankedPlayerConverter) .add(SimpleDateConverter) .add(KotlinJsonAdapterFactory()) .build()And make sure you're using implementation("com.squareup.moshi:moshi-kotlin:1.9.1")
I'm using retrofit and I had to do the following:
In the build.grade:
implementation "com.squareup.moshi:moshi-kotlin:$moshiVersion"In my repository:
val moshi = Moshi.Builder() .add(KotlinJsonAdapterFactory()) .build()val retrofit = Retrofit.Builder() .baseUrl(WEB_SERVICE_URL) .addConverterFactory(MoshiConverterFactory.create(moshi)) .build()