This is often caused by a dependency issue. It is recommended to follow the Troubleshooting guide <https://cloud.google.com/dataflow/pipelines/troubleshooting-your-pipeline#encoding-errors-ioexceptions-or-unexpected-behavior-in-user-code>to ensure that you have all of the latest dependencies, and that you are using the latest supported Dataflow SDK <https://cloud.google.com/dataflow/support>. If you still experience this issue after updating your libraries, it is recommended to report your issue to the Dataflow team on their Issue Tracker <https://github.com/GoogleCloudPlatform/DataflowJavaSDK/issues?utf8=%E2%9C%93&q=NoClassDefFoundError> .
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