Missing class: com.fasterxml.jackson.core.type.TypeReference. R8:Warning - android-studio

Question

After I updated Android Studio to 3.5, I am facing below warning whenever I build my Project.
Missing class: com.fasterxml.jackson.core.type.TypeReference
My project is using AndroidX. Here is the gist for my build.gradle(app)
https://gist.github.com/Arkar009/4ae5a05ff3435636bc605fee1fbdb050 . Can anyone know why this error occurs or alternative ideas to solve this error? Thanks in advances.

Answer 1

If you're super sure you will remember this line if you include Jackson later in your project, this does the trick (add it in your project's proguard-project.[txt|pro] file):
-dontwarn com.fasterxml.jackson.core.type.TypeReference
That class gets included somehow in the missing classes Set in R8 (I didn't go that far in R8's code), but you can skip the warning if you get that class in the list of patterns for "Don't Warn" rules (see com/android/tools/r8/R8.java):
List<ProguardConfigurationRule> synthesizedProguardRules = new ArrayList<>();
timing.begin("Strip unused code");
Set<DexType> classesToRetainInnerClassAttributeFor = null;
try {
Set<DexType> missingClasses = appView.appInfo().getMissingClasses();
missingClasses = filterMissingClasses(
missingClasses, options.getProguardConfiguration().getDontWarnPatterns());
if (!missingClasses.isEmpty()) {
missingClasses.forEach(
clazz -> {
options.reporter.warning(
new StringDiagnostic("Missing class: " + clazz.toSourceString()));
});
TBH, I was also bugged enough by this warning to get into R8, hope it helps!