j2ee/dbdriver is a SAP Parameter attribute which is used to control Database driver location information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
List of Java archives for database connection. The entries in the list
are separated by a platform-specific path separator character (for
Microsoft Windows a semi-colon, for UNIX a colon).
See SAP Parameter Documentation for full SAP documentation for this profile parameter.