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kotlinlang

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

Adapter is not resolving the issue for me either

you can't catch the exception in your adaptor?

<https://stackoverflow.com/questions/8863429/how-to-handle-a-numberformatexception-with-gson-in-deserialization-a-json-respon?rq=1>

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(...)`?

or at the bottom of the stackoverflow, maybe you need something like:

```registerTypeAdapter(java.lang.Integer::class.java, adapter)```

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?

or try the Factory method like in the stackoverflow?

`java.lang.Integer::class.java` works fine thanks

Is that because gson doesn't recognize kotlin `Int` or what?