ClassNotFoundException for Gson and Joda

[erayerdin]

According to the project's build file, gson and joda-time is already included.

However, if I only include CacheLib, I get the error below

Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.gson.GsonBuilder" on path: DexPathList[[zip file "/data/app/foo.bar.baz-G4Zk4FIQSWiDXJEaqDt4mQ==/base.apk"],nativeLibraryDirectories=[/data/app/foo.bar.baz-G4Zk4FIQSWiDXJEaqDt4mQ==/lib/arm, /system/lib, /vendor/lib]]

However, I include the libraries manually and it works:

implementation 'com.google.code.gson:gson:2.8.5'
implementation 'joda-time:joda-time:2.10.2'