Log4j 2 - Not implemented method used in JDBC appender

[Betty User]

Hello,

I am trying to log Log4j 2 events into PostgreSQL database via JDBC
appender with datasource (com.jolbox.bonecp.BoneCPDataSource).

This data source uses JDBC driver for PostgreSQL
(postgresql-9.2-1003.jdbc4.jar) but there isn't implemented
method org.postgresql.jdbc4.Jdbc4PreparedStatement.setNString(int, String)
which is called from Log4j 2.

Is there some another way how to use Log4J database appender with
PostgreSQL database?

Thank you for suggestions how to solve this issue.

M.