Gson: Kotlin null safety

[vkropivko]

Hi,
When there is a field with a null value, it is written to the notnull field in the Kotlin object. How to make sure that the default value is not overwritten by null

[JakeWharton]

You would need to write a custom TypeAdapter which used Kotlin's reflection library to call the primary constructor and set values via properties. Moshi has an adapter you can port to Gson if you want: https://github.com/square/moshi/blob/master/kotlin/src/main/java/com/squareup/moshi/KotlinJsonAdapter.kt, but we won't be adding one to Gson.

[vkropivko]

Thank you

[hrach]

Hi, does anybody know about solution for Gson? I found https://github.com/sargunv/gson-kotlin but it seems to have some flaws with primitive types (see issue 3), also, reusing full reflection seems quite heavy. Or is it better to switch to other library?

[JakeWharton]

Try https://github.com/ansman/kotshi

[ghost]

Hi, just curious what's the reason behind not supporting/planning to support it in Gson? does it require a huge refactoring or something?