Anyone please help..how to resolve this? Overload resolution ambiguity: public open fun <T : Any...

# announcements

[Dhanya S Pillai]

Anyone please help..how to resolve this?
Overload resolution ambiguity:

public open fun <T : Any!> fromJson(p0: JsonElement!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson
public open fun <T : Any!> fromJson(p0: JsonReader!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson
public open fun <T : Any!> fromJson(p0: Reader!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson
public open fun <T : Any!> fromJson(p0: String!, p1: Type!): TypeVariable(T)! defined in com.google.gson.Gson

[Roukanken]

what are you calling the function with? It seems that first argument is ambiguous, therefore it can't select which function of these 4 to call

[Dhanya S Pillai]

return Gson().fromJson(databaseValue, object : TypeToken<UserProfile?>() {}.type)

[Dhanya S Pillai]

error pointing on this line

[Roukanken]

what type is databaseValue ?

[Dhanya S Pillai]

it is a string

[Roukanken]

if it was a string, this error would not show up, are you sure of that?

[Dhanya S Pillai]

Yes

[Dhanya S Pillai]

class UserProfileConvertor : PropertyConverter<UserProfile, String> {
    override fun convertToEntityProperty(databaseValue: String?): UserProfile? {
        if (databaseValue == null) {
            return null
        }
        return Gson().fromJson(databaseValue, object : TypeToken<UserProfile?>() {}.type)
    }

    override fun convertToDatabaseValue(entityProperty: UserProfile?): String? {
        return if (entityProperty == null) null else Gson().toJson(entityProperty)
    }

    fun convertToDatabaseValue(user_profiles: MutableList<Any?>): String? {
        return if (user_profiles == null) null else Gson().toJson(user_profiles)

    }
}

[Dhanya S Pillai]

This is the class

[christophsturm]

maybe because its nullable?

[christophsturm]

what if you change it to databaseValue!! ?

[Roukanken]

should be smartcasted tho, no?
But yes, nullable might be the cause

[Dhanya S Pillai]

plz check the above class i made some change

[Dhanya S Pillai]

i dont think it is about the nullable

[christophsturm]

submit an issue here: http://kotl.in/issue that the error message should be improved.

[christophsturm]

its really the job of the kotlin compiler to output a useful error message here

[Dhanya S Pillai]

Okay

[Dhanya S Pillai]

So i should wait for the response from kotlin right?

[christophsturm]

what happens when you change it to return Gson().fromJson("", object : TypeToken<UserProfile?>() {}.type)

[christophsturm]

just try to minimize it and find a simple version that fails, then fix it

[Dhanya S Pillai]

let me check