Hello,
My config :
Pentaho CE = pentaho-server-ce-8.1.0.0-365
Mysql = Vesta CP
Server Pentaho :
Win server 2008 R2
i7
8Gb RAM
SSD124
I test to connect mySQL and key fields remain blank ...
https://image.ibb.co/je2URU/002.png
Here all are ok DB
https://image.ibb.co/js3a0p/002BISSx.png
Here what I see log. (PS = I host a Wordpress also on this server mysql so it should be ok ...)
https://image.ibb.co/grqut9/001.png
Pentaho = HARD ! .....