Execution failed for task :app:mergeDebugJavaResource in Android Studio: How to Resolve It

Discover how to resolve the common Android Studio error "Execution failed for task :app:mergeDebugJavaResource" with clear steps and solutions.
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How to Resolve 'Execution failed for task :app:mergeDebugJavaResource' in Android Studio?

Have you encountered the error 'Execution failed for task :app:mergeDebugJavaResource' while working in Android Studio? You're not alone. This error can be a stumbling block for many developers, but there are proven methods to resolve it. Below, we detail the solutions you can implement to get your project back on track.

Understanding the Error

The error typically reads:

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This compiler message signifies that there's an issue merging resources when building your app in debug mode.

Common Causes

The error can arise from various scenarios, including:

Duplicate Resources: Multiple resources with the same name in different folders.

Library Inconsistencies: Conflicting libraries or dependencies.

HTMLUnit Library: Specific use of HTMLUnit library leading to conflicts.

Solutions

Check for Duplicate Resources:

Navigate to your res directory.

Look for any resources (e.g., images, XML files) with the same name in different folders.

Rename or remove duplicates as necessary.

Resolve Library Inconsistencies:

Look for dependencies that might clash or might be included multiple times.

Use dependency resolution strategies to force a particular version, if needed.

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Clean and Rebuild Project:

Go to Build > Clean Project and then Build > Rebuild Project.

This can often clear out any lingering conflicts or outdated resources.

HTMLUnit Library Issues:

If using HTMLUnit and encountering this error, consider checking if the version of HTMLUnit is compatible with other libraries in your project.

Consider updating or changing the version of HTMLUnit to a more compatible one.

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Invalidate Caches/Restart:

In Android Studio, go to File > Invalidate Caches / Restart.

This can help clear out any temporary issues related to cached data.

Conclusion

Facing the 'Execution failed for task :app:mergeDebugJavaResource' error can be frustrating, but with the steps outlined here, you should be able to identify and resolve the problem efficiently. Always keep your dependencies updated and well-documented to avoid such issues in the future.

Happy coding!