How to Resolve `NoClassDefFoundError` When Using Third-Party Libraries in Android Eclipse Projects?

ECLIPSE AND ANDROID: RESOLVING NoClassDefFoundError

When adding third-party libraries to Android projects, you may encounter a NoClassDefFoundError. This error indicates that the app cannot find a specific class in the libraries.

Symptoms:

You may see an error message similar to the following:

java.lang.NoClassDefFoundError: com.scoreninja.adapter.ScoreNinjaAdapter

Causes:

This error often occurs when the build path configuration is incorrect or the specified class is not actually included in the library.

Solution:

To resolve this issue, you can try the following:

1. Ensure Proper Build Configuration: Check if the library is properly added to the build path by right-clicking on the project in Eclipse, selecting "Properties," and then navigating to "Java Build Path" followed by "Libraries."
2. Rename "lib" to "libs": If you store your jars in a folder named "lib," rename it to "libs" as recommended by Android ant conventions.
3. Clean and Rebuild: Clean the project and rebuild it to force Eclipse to regenerate the build path.
4. Restart Eclipse: Close and restart Eclipse to ensure that all changes have taken effect.
5. Check Library Contents: Manually inspect the library's contents to confirm that the necessary class is present.

If you have already attempted these steps without success, you may need to consult the documentation or forum of the library provider for further troubleshooting assistance.

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