why do you have an explicit

IntDeserializer()

? maybe try removing that line, gson can deserialize Ints automatically.

It doesn't deserialize empty string for me, eg sending

ageGroupId:""

gives me

NumberFormatException: empty String

which I wanted to handle explicitly. Is there a way to handle that without adapter

you can't catch the exception in your adaptor?

Yes I am doing something like that but the adapter doesn’t seem to be called, so it’s still using the default deserializer

ok, so you just need to figure out how to properly register the adaptor. did you try

registerTypeAdapterFactory(...)

?

Yes I am doing it like this:

install(ContentNegotiation){
                register(ContentType.Application.Json, GsonConverter(GsonBuilder().apply {
                    setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)

                    registerTypeAdapter(DateTime::class.java, DateTimeDeserializer())
                    registerTypeAdapter(Int::class.java, IntDeserializer())
                }.create()))
            }

maybe you need

java.lang.Integer::class.java

instead?

Hmm.. I’d try that. Thanks

or try the Factory method like in the stackoverflow?

java.lang.Integer::class.java

works fine thanks

yeah, that's my guess