After upgrading to Android Gradle Plugin from 3.1.4 to 3.2.x I'm getting multiple warnings such as:
D8: Type `com.google.gson.reflect.TypeToken` was not found, it is required for default or static interface methods desugaring of `com.google.gson.reflect.TypeToken org.springframework.http.converter.json.GsonHttpMessageConverter.getTypeToken(java.lang.reflect.Type)`
D8: Type `com.squareup.okhttp.MediaType` was not found, it is required for default or static interface methods desugaring of `com.squareup.okhttp.MediaType org.springframework.http.client.OkHttpClientHttpRequest.getContentType(org.springframework.http.HttpHeaders)`
D8: Type `org.apache.http.impl.client.HttpClients` was not found, it is required for default or static interface methods desugaring of `void org.springframework.http.client.HttpComponentsClientHttpRequestFactory.<init>()`
D8: Interface `org.apache.http.HttpEntity` not found. It's needed to make sure desugaring of `org.springframework.http.client.HttpComponentsStreamingClientHttpRequest$StreamingHttpEntity` is correct. Desugaring will assume that this interface has no default method.
D8: Type `org.conscrypt.Conscrypt` was not found, it is required for default or static interface methods desugaring of `okhttp3.internal.platform.Platform okhttp3.internal.platform.ConscryptPlatform.buildIfSupported()`
...
Project is using Java 1.8 source compatibility (lambdas) and it looks like warnings came from the Android gradle class dexer which has been enabled by default in the AGP 3.2.0.
I have tried to suppress these warnings in proguard-rules.pro
with the following lines, but nothing seems to work.
-dontwarn com.google.gson.reflect.TypeToken
-keep class com.google.gson.reflect.TypeToken { *; }
-dontwarn org.apache.http.**
-keep class com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.**
-keep class org.springframework.http.client.** { *; }
-dontwarn org.springframework.http.client.**
The only way I can make warnings to disappear is to set minifyEnabled
and useProguard
to false
in the build.gradle
file
I have tried AGP 3.3.0-alpha13 and the new AGP 3.2.1 but without success.
You can clone repository with sample project from https://github.com/mdawid/D8WarningTest
Update: the issue has been fixed in Android Gradle Plugin 3.5.0-beta05 (see issue: Ability to selectively suppress warnings during D8 desugaring).
For Android Gradle Plugins 3.2.1 - 3.4.1 use the following workarounds:
From Android Gradle plugin 3.2.1 changelog:
Desugaring with D8 is now enabled by default.
So you should disable desugaring with D8 (in project's gradle.properties
file):
android.enableD8.desugaring=false
If you use R8:
R8 is a new tool for code shrinking and obfuscation that replaces ProGuard. You can start using the preview version of R8 by including the following in your project’s
gradle.properties
file:android.enableR8 = true
disable desugaring with R8 (in project's gradle.properties
file):
android.enableR8.desugaring=false