Mapbox-java incompatible with gson 2.13.0 and up - call to internal GSON classes that were renamed

[freszu]

Attempted upgrading GSON (for internal app use and third-party integration requiring a newer version), but encountered issues with mapbox-java. R8 began reporting missing classes due to the following reference:

mapbox-java/services-geocoding/src/main/java/com/mapbox/api/geocoding/v5/SingleElementSafeListTypeAdapter.java

Line 6 in 9776512

import com.google.gson.internal.$Gson$Types;

The root cause is the renaming of internal classes in GSON version 2.13.0:

The internal classes $Gson$Types and $Gson$Preconditions have been renamed to remove the $ characters. Since these are internal classes (as signaled not only by the package name but by the $ characters), client code should not be affected. If your code was depending on these classes then we suggest making a copy of the class (subject to the license) rather than depending on the new names.

r8 error:

ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in REDACTED/missing_rules.txt.
ERROR: R8: Missing class com.google.gson.internal.$Gson$Types (referenced from: com.google.gson.TypeAdapter com.mapbox.api.geocoding.v5.SingleElementSafeListTypeAdapter$1.create(com.google.gson.Gson, com.google.gson.reflect.TypeToken))

[LimmaPaulus]

I'm encountering this too. Any workarounds?

[LimmaPaulus]

Ok, found a workaround myself.

Download the deleted file from Gson-repository history. You need both $Gson$Types.java and $Gson$Preconditions.java. Direct links to files before rename:

$Gson$Types.java
$Gson$Preconditions.java

Then just add them to your project structure to the correct path:

Mapbox authors: Please update the Gson dependency version asap