Missing type parameter RuntimeException

Gson version

‘2.8.9’

Java / Android version

Java 11 / Android all

I’m facing following exception with Gradle version ‘7.1.0’, whereas ‘7.0.4’ is working fine. The issue is happening in both cases when minifyEnabled = true/false in that module, but main app module has minifyEnabled=true and proguard rules are mentioned as well.

Fatal Exception: java.lang.RuntimeException
Missing type parameter.
com.google.gson.reflect.TypeToken.getSuperclassTypeParameter (TypeToken.java:84)
com.google.gson.reflect.TypeToken.<init> (TypeToken.java:62)

[forlayo]

In my case was just adding the following to proguard configuration:

# Retain generic signatures of TypeToken and its subclasses with R8 version 3.0 and higher.
-keep,allowobfuscation,allowshrinking class com.google.gson.reflect.TypeToken
-keep,allowobfuscation,allowshrinking class * extends com.google.gson.reflect.TypeToken

Here you go the full set of options that are needed for Gson -> https://github.com/google/gson/blob/master/examples/android-proguard-example/proguard.cfg

[easyonebd]

if anyone has the same problem, didn’t gotten any solution yet, you can try this. I faced the same issue and adding these 3 lines in progurd saved my day.

-keep class com.google.gson.reflect.TypeToken
-keep class * extends com.google.gson.reflect.TypeToken
-keep public class * implements java.lang.reflect.Type