The BookshelfLogHelper interface is a new dependency to our project it needs to be added to the bookshelf-service POM:

<dependency>
<groupId>com.packtpub.felix</groupId>
<artifactId>com.packtpub.felix.bookshelf-log-api</artifactId>
<version>1.10.0</version>
</dependency>

Now that the dependency is added, we can start making the changes to the bookshelf service implementation class.