I m using Retrofit s `MoshiConverterFactory` for my API call

Question

I m using Retrofit s `MoshiConverterFactory` for my API calls however it doesn t support sealed classes containing `object`s I m trying to generate adapters for the sealed class hierarchy using `moshi sealed` but I still get the error `object Always cannot be serialized` Here the hierarchy ``` Keep JsonClass generateAdapter = true generator = sealed type sealed class TriggerCondition val type String Serializable Keep TypeLabel ALWAYS object Always TriggerCondition ALWAYS Keep TypeLabel NIGHT object Night TriggerCondition NIGHT Keep TypeLabel LIGHT SENSOR JsonClass generateAdapter = true data class LightSensor val sensorInfo SensorInfo TriggerCondition LIGHT SENSOR ```

Zac Sweers · Answer

This isn t enough info to help How are you configuring your retrofit and Moshi instances How are you defining your retrofit endpoint

Lukasz Kalnik · Answer

```fun create client OkHttpClient baseUrl String AirConnectorApi = Retrofit Builder baseUrl baseUrl client client addConverterFactory MoshiConverterFactory create moshiForKotlin addCallAdapterFactory EitherCallAdapterFactory build create AirConnectorApi class java ```

Lukasz Kalnik · Answer

```val moshiForKotlin = Moshi Builder add KotlinJsonAdapterFactory build ```

Lukasz Kalnik · Answer

This is the stack trace ```java lang IllegalArgumentException Unable to create converter for class myapp gatewayapi data remote air model AutomationList for method AirConnectorApi getAutomations at retrofit2 Utils methodError Utils java 54 at retrofit2 HttpServiceMethod createResponseConverter HttpServiceMethod java 126 at retrofit2 HttpServiceMethod parseAnnotations HttpServiceMethod java 85 at retrofit2 ServiceMethod parseAnnotations ServiceMethod java 39 at retrofit2 Retrofit loadServiceMethod Retrofit java 202 at retrofit2 Retrofit$1 invoke Retrofit java 160 at java lang reflect Proxy invoke Proxy java 1006 at $Proxy12 getAutomations Unknown Source at myapp gatewayapi data remote air AirConnectorApi$DefaultImpls getAutomations$default AirConnectorApi kt 142 at myapp gatewayapi data remote common CommonConnectorApiAirImpl getAutomations CommonConnectorApiAirImpl kt 267 Caused by java lang IllegalArgumentException Cannot serialize object declaration myapp gatewayapi data remote air model TriggerCondition$Always for class myapp gatewayapi data remote air model TriggerCondition triggerCondition for class myapp gatewayapi data remote air model SensorTrigger for interface myapp gatewayapi data remote air model AutomationTrigger trigger for class myapp gatewayapi data remote air model ExistingAutomation for java util List lt myapp gatewayapi data remote air model ExistingAutomation gt items for class myapp gatewayapi data remote air model AutomationList```

Lukasz Kalnik · Answer

Containing class `ExistingAutomation` just implements `Serializable` it s not annotated with ` JsonClass `

Zac Sweers · Answer

That stacktrace is complaining about something called AutomationList

Lukasz Kalnik · Answer

Yes that s the return type of the Retrofit API call

Zac Sweers · Answer

How is that class defined It s not in your snippets above

Lukasz Kalnik · Answer

```data class AutomationList val total Int val items List lt ExistingAutomation gt ```

Zac Sweers · Answer

And existingautomation

Lukasz Kalnik · Answer

```sealed interface Automation Serializable val name String val trigger AutomationTrigger val command Command data class ExistingAutomation val id String override val name String override val trigger AutomationTrigger override val command Command Json name = pending state val pendingState DeviceState = null Json name = provisioning complete val provisioningComplete Boolean = null Json name = provisioning states val provisioningStates List lt ProvisioningState gt = null Automation```

Lukasz Kalnik · Answer

But why is there ```Caused by java lang IllegalArgumentException Cannot serialize object declaration myapp gatewayapi data remote air model TriggerCondition$Always``` in my stacktrace

Zac Sweers · Answer

I don t know

Lukasz Kalnik · Answer

It points to `object `Always`

Lukasz Kalnik · Answer

So for me it looks as though the Retrofit `MoshiConverterFactory` was not able to cooperate with `moshi sealed` annotated classes

Zac Sweers · Answer

I don t see anything obviously wrong there but there may be other issues in your build If you can make a reproducible sample that would help

Lukasz Kalnik · Answer

Ok thanks for the help

Zac Sweers · Answer

Moshi converter factory works fine with Moshi sealed

Lukasz Kalnik · Answer

Do I have to register some special adapters with my Moshi instance to use moshi sealed

Zac Sweers · Answer

Only if you use reflection

Zac Sweers · Answer

But your snippet says you re using code gen

Lukasz Kalnik · Answer

Yes

Lukasz Kalnik · Answer

Ok thank you very much for you time

Lukasz Kalnik · Answer

I will try to figure it out