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There are a few steps you can take to resolve a ClassNotFoundException that occurs while creating a SpyBean for a JpaRepository:

1. Check if you have the required dependencies: Make sure you have included the necessary dependencies required for using the JpaRepository in your project. Some of the commonly used dependencies are Spring Data JPA, Hibernate, and JDBC driver.

2. Check your configuration: Ensure that your configuration files are set up correctly. Check if you have correctly configured the application context and if the necessary beans have been defined.

3. Check your classpath: Make sure that the classpath is set up correctly. If you are using an IDE like Eclipse or IntelliJ, verify if all required jars are present in the build path.

4. Check the version compatibility: Ensure that the version of the Spring Data JPA matches with the version of Hibernate and other dependencies.

5. Check the package name and class name: Ensure that you have specified the correct package name and class name of the JpaRepository in your test class.

6. Check for typos: Make sure that there are no typos or misspellings in the names of the classes or packages.

If you are still facing issues, try debugging your application to identify the root cause of the ClassNotFoundException.