On Wed, May 22, 2019 at 12:40 PM 'ilker cam' via jackson-user
<jackson-user@googlegroups.com> wrote:
>
> Hi,
>
> I have a property which can be an integer or an object without any explicit
> `type` property. I tried to use JsonDeserialize annotation and provide a
> custom deserializer;
>
> data class Report(val measures: List<IntOrMeasure>)
>
> @JsonDeserialize(using=IntOrMeasureDeserializer::class)
> sealed class IntOrMeasure {
> data class MeasureDefinition(val collection :
> DataMappingHttpService.RakamCollection, val name : String) : IntOrMeasure()
> data class MeasureId(val id : Int) : IntOrMeasure()
> }
>
> class IntOrMeasureDeserializer : JsonDeserializer<IntOrMeasure>() {
> override fun deserialize(p: JsonParser?, ctxt: DeserializationContext?):
> IntOrMeasure {
> return if(p!!.currentToken().isNumeric) {
> p.readValueAs(IntOrMeasure.MeasureId::class.java)
> } else {
> p.readValueAs(IntOrMeasure.MeasureDefinition::class.java)
> }
> }
> }
>
>
> p.readValueAs(IntOrMeasure.MeasureId::class.java) recursively calls
> deserialize again thus resulting with overflow.
> Any insights are appreciated, thanks.
What happens when you call `readValueAs()` is that parser calls back
to ObjectMapper linked to parser, asks for deserializer registered for
given type, calls its `deserialize()` method. So the question would be
what specifically is registered to handle `MeasureId` or
`MeasureDefinition`. If it's the same deserializer implementation for
some reason (maybe due to subclassing?) then there'd be infinite loop.
I hope this helps,
-+ Tatu +-
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