Usually, when I use Gson, I need to add special logic so that a field of Optional<X> gets serialized as X if it's present, and gets omitted if it's empty; and conversely on deserialization. This seems like the only reasonable way to handle Optional. Would you consider offering this feature (or accepting a PR that implements it)?
prdoyle
All 5 comments
Gson can't depend on Java 8 types as it supports down to Java 6.
JakeWharton
on 14 Jun 2017
@JakeWharton So? It could always be in a separate module.
kaqqao
on 30 Nov 2018
It looks like such a module exists: https://github.com/hsiafan/gson-java8-datatype
The errors emitted if you forget to include it are very confusing and do not obviously lead you to determining that you must install this module, but once you do, Optional types work fine.
stevenschlansker
on 19 Mar 2019
really would like to see this. Coming from Swift, the use of Optional with JSON is very useful.
marcblanchet
on 5 Aug 2019
Gson can't depend on Java 8 types as it supports down to Java 6.
With Multi-Release JARs this would now be possible, at least for JRE >= 9.
Marcono1234
on 20 May 2020
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Most helpful comment
With Multi-Release JARs this would now be possible, at least for JRE >= 9.