PostgreSql Bulkloader step is applicable in local system and if so is it possible to implement this step for JNDI connection
If you are considering your LocalSystem as a Window's Machine, it didnt work for me where the db was in a linux machine and the pentaho was in windows. It has got some issues with dual OS. Check this issue. But ideally on a windows to windows db , bulk loader step should work.
But for a Linux System, it works fine. I am not sure about MacOS.
For JNDI Connection: You cannot use a JNDI database connection since its not supported.
Please check this link.
Hope this is what you are looking for :)