Libreoffice Base JDBC Driver loading failed

Hello!
I have trouble to connect to MariaDB database with error message: JDBC driver loading failed at C:/cygwin64/home/buildslave/source/libo-core/dbaccess/source/ui/dlg/sqlmessage.cxx:571.
I added maria JDBC driver to CLASSPATH. How to solve this?

Please show the driver class you have chosen.
Should be org.mariadb.jdbc.Driver if you have downloded the JDBC-driver for MaraiaDB.