IssueTracker

Problem

Many users may run into the following error:

Execution failed for task 'someTask'.
...
  > Failed to transform '/path/to/someJar.jar (or someAar.aar)' using Jetifier. 
  Reason: IllegalArgumentException, message: Unsupported class file major version XY.

Root cause

The Jetifier tool used by the Android Gradle plugin is not using a high-enough version of ASM, which means Jetifier is unable to parse class files whose Java versions are too new (higher than what ASM can process).

Solutions/workarounds

This issue is not going to be fixed in Jetifier as we are no longer maintaining the Jetifier tool.

Please try one of the following workarounds, most likely it will resolve this issue:

1. Update to the latest version of the Android Gradle plugin (this forces Jetifier to use a higher version of ASM through Gradle dependency resolution)
2. In your gradle.properties file, disable Jetifier:

[REMOVE THIS LINE =>] android.enableJetifier = true

3. In your gradle.properties file, request Jetifier to not process the jar/aar:

# If you're using AGP 4.2 and later, set
android.jetifier.ignorelist = name/path of the jar/aar file that failed (e.g., someJar.jar or someAar.aar)

# If you're using AGP 4.1 and earlier, set
android.jetifier.blacklist = name/path of the jar/aar file that failed (e.g., someJar.jar or someAar.aar)

4. In some cases, using a lower version of JDK for running the build might help (see https://developer.android.com/build/jdks#jdk-config-in-studio and https://issuetracker.google.com/335524393#comment2)