for 7.1.2 you should use JDBC-Adapter 6.5 to take advantage of some new ART features.
Make sure to place an appropriate version of the database driver (JDBC Type4 driver) from the database vendor under WmJDBCAdapter/code/jars.
Make sure your have the latest SCG_DatabaseDirect-Fix applied for your wM version to achieve compatibility.
Please consider upgrading to IS 7.1.3 with latest Fixes as this will the base for further migrations to a more recent wM version.
This combination can/might work, but it is not guaranteed that it does.
If it does not: bad luck.