User wants to pre-fill JDBC connections in the narayana connection pool light after booting up karaf container.
Although org.apache.commons.dbcp2.BasicDataSource has an option called "initialsize", narayana connection pool does not have one.
https://commons.apache.org/proper/commons-dbcp/apidocs/org/apache/commons/dbcp2/BasicDataSource.html

Please consider to implement another option for narayana connection pool.