.NoClassDefFoundError: org/apache/hadoop/conf/Configuration

This error occurs when the class loader is unable to find the class "org/apache/hadoop/conf/Configuration". This can happen due to a variety of reasons, such as missing dependencies or incorrect classpath settings.

To resolve this issue, try the following steps:

1. Check if all the required dependencies are present in the classpath. You may need to add the Hadoop libraries to your project's classpath.

2. Make sure that the version of Hadoop you are using is compatible with the version of the libraries you are using.

3. Check if there are any conflicts between the versions of the Hadoop libraries and other libraries in your project.

4. Check if the classpath is set correctly. You can try adding the Hadoop libraries explicitly to the classpath.

5. If you are running the code on a cluster, make sure that Hadoop is installed and configured properly on all the nodes.

If none of the above steps work, you may need to investigate further to determine the root cause of the issue.