openHAB2 & MySQL persistence setup

Hello..
Followed the guide, but i get the following errors:

"mySQL: Connection not valid"
mySQL: tableName was null
mySQL: Could not create entry for 'Temp_Outside_South' in table 'Items' with statement 'INSERT INTO Items (ItemName) VALUES (?)': No operations allowed after connection closed.

But i don’t get any connection errors anymore, first it told me that password and user wasn’t okay - but after correcting this?
I only installed the MySQL - not the JDVC MySQL, as i can see that @gerrit says it isn’t nessecary?

When checking in the SQL database i can see that the table are created, one for Itemname and one for ItemID - but no data in them

UPDATE:
Uninstalled erverything, and only installed the JDBC-MySQL and the Addon for the JDBC (see guide here)

Also you need to make a jdbc.persist file - and not the mysql.persist
This worked for me