Why Am I Getting a 'NoClassDefFoundError' When Using the scoreninja Library in My Android Project?

NoClassDefFoundError in Eclipse and Android Development

When executing an Android application integrated with external libraries, it is possible to encounter a "NoClassDefFoundError" exception. This error typically occurs when the Java Virtual Machine (JVM) is unable to locate a class required by the application's code.

Cause of the Error

The "NoClassDefFoundError" error in the provided context is related to the addition of the "scoreninja" library to the application's build path. This indicates that the JVM cannot find the class "com.scoreninja.adapter.ScoreNinjaAdapter," which is part of the "scoreninja" library.

Resolving the Error

To resolve the error, ensure that the "scoreninja" library is correctly configured in your project's build path:

1. Remove the existing "scoreninja" JAR file from the build path. This will force Eclipse to重新创建类路径，并正确识别库。
2. Rename the "lib" folder (which contains the JAR files) to "libs". This is an Ant convention that is now required by ADT to recognize libraries in APK files.
3. Clean and rebuild the project. This will regenerate the build scripts and ensure that the new library is included in the classpath.

Additional Considerations

• Check your library's dependencies. Ensure that any additional libraries required by the "scoreninja" library are also included in the classpath.
• Restart Eclipse. This can sometimes resolve issues with the IDE's classpath caching.

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