Android项目运行失败：Desugar任务出错，无具体错误原因

Hey there, I feel your frustration—this vague desugar error is so annoying, especially after you’ve already tried the go-to fixes like cleaning/rebuilding and disabling D8. Let’s break this down and get to the bottom of it:

Why Aren’t You Seeing the Exact Error Cause? #

The error log you shared is truncated (notice it cuts off mid-command at --input /Users/babak/Desktop/Projects/myAndroidProject/myAndroidProjectApp/app/build/intermediates/transforms/stackFram...). Android Studio’s default build output hides full logs to save space, so you’re missing the actual exception that triggered the desugar failure. That’s why you can’t pinpoint what’s going wrong.

Steps to Uncover the Real Issue & Fix It #

1. Grab the Full Build Log (Critical!) #

First, you need to see the complete error trace:

• In Android Studio: Click the "Toggle View" button (the expand icon) in the Build tab to show the full log.
• Or use the command line for even more detail:

  ./gradlew assembleGreenDebug --info
  

  Look for lines right after the desugar command that mention specific exceptions (like java.lang.IllegalArgumentException) or references to problematic classes—this will reveal the real root cause.

2. Double-Check Your Java Version Setup #

Desugar relies on consistent Java version configurations. Open your app’s module-level build.gradle and make sure these settings are correct:

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    // If you're using Kotlin, add this too:
    kotlinOptions {
        jvmTarget = "1.8"
    }
}

Mismatched versions here are a common culprit for desugar failures.

3. Hunt for Problematic Dependencies #

Third-party libraries can sometimes have bytecode that clashes with desugar. Try:

• Removing any recently added dependencies and rebuilding to see if the error disappears.
• Running ./gradlew app:dependencies to check for duplicate or conflicting library versions, especially those using Java 8+ features without proper desugar support.

4. Update Android Gradle Plugin (AGP) & Gradle #

Older AGP versions have known desugar bugs. Update to the latest stable release:

• Open your project-level build.gradle and set com.android.tools.build:gradle to a recent stable version (e.g., 7.4.2 or 8.1.0, matching Gradle’s compatibility requirements).
• Sync your project and rebuild.

5. Invalidate Caches & Restart #

You tried cleaning/rebuilding, but sometimes Android Studio’s cached data sticks around. Go to File > Invalidate Caches... > Invalidate and Restart—this clears stale build artifacts that might be causing hidden issues.

Final Note #

Once you get the full log, the root cause will almost certainly jump out—whether it’s a broken dependency, misconfigured Java version, or a specific class that desugar can’t process. Start with grabbing the complete log, and you’ll be halfway to fixing this!

内容的提问来源于stack exchange，提问作者babak faghihian