I managed to fix the issue. It was related to the version of the jdbc driver.   I did the following:   In Linux browser go to https://dev.mysql.com/downloads/connector/j/   Select   • Ubuntu Linux • 18.04   Download   In a CLI terminal go to the Downloads directory   $ cd /home/bernardo/Downloads Unpack the deb file   $ sudo dpkg -i mysql-connector-java_8.0.26-1ubuntu18.04_all.deb Check where is the connector location in the file system   $ dpkg -L mysql-connector-java | fgrep jar /usr/share/java/mysql-connector-java-8.0.26.jar Clean /usr/share/java from the previous jdbc driver   $ sudo rm mysql-connector-java-5.1.45.jar $ sudo rm -r com $ sudo rm -r META-INF/ Install the connector: unpack the .jar file   $ sudo jar xvf /usr/share/java/mysql-connector-java-8.0.26.jar To find the driver class name, open /usr/share/java/META-INF/services/java.sql.Driver   $ cat /usr/share/java/META-INF/services/java.sql.Driver com.mysql.cj.jdbc.Driver The driver class name is: com.mysql.jdbc.Driver   Restart Apache Ni-Fi   Modify the configuration of the controller service with:   • Database Driver Class Name: com.mysql.cj.jdbc.Driver • Database Driver Location: /usr/share/java/mysql-connector-java-8.0.26.jar ... View more

@justenji    Thanks a lot! The suggestion you proposed works great!   However, the source of the problem was not a lack of schema definition. In fact, I managed also to have a working flow with the option Schema Access Strategy = Use String Fields From Header in the CSVReader processor.   The warning "None of the fields in the record map to the columns defined by the tablename table." is also obtained when the processor is not able to find the table and this can happen also when the table name is correctly configured in PutDatabaseRecord but there is some issue with user access rights (which ended up to be the actual cause of my error ...). ... View more