transformClassesWithFirebasePerformancePlugin Gradle task error Can't instrument because of null. Copying as is.

Environment

• Android Studio version: 4.1.3
• Firebase Component: Performance
• Component version: com.google.firebase:firebase-bom:26.8.0
• Plugin version: com.google.firebase:perf-plugin:1.3.5

The problem

HTTP/S network request trace and Monitor specific methods using @AddTrace does not report to Firebase.

• Steps to reproduce: Run the gradle task ‘transformClassesWithFirebasePerformancePluginForYourBuildFlavor’.

Build is successful compile but @AddTrace and network monitor does not work and I have a lot of errors in output log. There are so many errors that the buffer overflows. Looks like it logs for all classes like this:

[DEBUG] [FirebasePerformancePlugin] instrumentClassFile() >> inputFile: 'path_to_class/MyClass.class' 
[ERROR] [FirebasePerformancePlugin] Can't instrument because of null. Copying as is.

[thebrodyaga]

The problem is https://github.com/gradle/gradle/issues/12286 Easy solution is add in buildSrc/build.gradle like https://github.com/firebase/firebase-android-sdk/blob/master/buildSrc/build.gradle

def perfPluginVersion = System.getenv("FIREBASE_PERF_PLUGIN_VERSION") ?: "1.3.5"
dependencies {
    implementation "com.google.firebase:perf-plugin:$perfPluginVersion"
}

[google-oss-bot]

Hey @thebrodyaga. We need more information to resolve this issue but there hasn’t been an update in 5 weekdays. I’m marking the issue as stale and if there are no new updates in the next 5 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!