Did you create the OSGi config with com.day.commons.datasource.jdbcpool.JdbcPoolService and added the DB details into it?
The JDBC Connections Pool service is a factory. Therefore, if you use a sling:OsgiConfig node to configure the connection service, the name of the node must include the factory service PID followed by -alias. The alias that you use must be unique for all configuration nodess for that PID. An example node name is com.day.commons.datasource.jdbcpool.JdbcPoolService-mydb