Chart data not displaying in sitemap. JDBC to mysql. Solution found.. Changed?

Setup, Configuration and Use Items & Sitemaps
1

openhab 2.5.6-2 up-to-date on 22/7/2020
I have a line
Chart item=GV_Tuin_Multi_Sensor_Temperature_Temperature period=D service=“JDBC” refresh=60000
After the last update, this suddenly didn’t display chart data (empty chart). I could see in my MYSQL (mariadb) tables, that the data was correctly saved.
Solution:
Chart item=GV_Tuin_Multi_Sensor_Temperature_Temperature period=D service=“jdbc” refresh=60000
so, jdbc in lowercase solved my problem. Strange… It was working with JDBC in uppercase before…
Something changed???

2

Perhaps JDBC never worked, and it defaulted to your system defined default.

3

my system default is mapdb. Both save data…