I use the Debian package of Openfire. It seems that the PostgreSQL driver has been modified between versions 3.6.2 and 3.6.3.
When configuring Openfire 3.6.3 with an external PostgreSQL database (“standard database connection”/“Database settings - Standard connection” in the setup), I get the following error message:
“Unable to load the specified JDBC driver. Please verify the name of the driver is correct and that the driver is in the classpath of this server (usually the ‘lib’ directory). If you add a driver to your classpath you will need to restart the server.”
With the sames settings, I don’t get any error message with versions 3.6.2 and 3.6.1.
If I replace the driver (‘postgresql.jar’) of version 3.6.3 with the one of version 3.6.2 in /usr/share/openfire/lib, it’s OK.