When trying to configure Oracle Database v18.104.22.168 (or equivalent) during IBM Security Identity Manager (ISIM) v6.0 installation, you may be getting a java.lang.NullPointerException exception. The JDBC driver used is Oracle Database 11g Release 2 (v22.214.171.124).
Looking further into the logs, you can see the following lines as well:
DBConfig.loadDBData: ---- Loading file: C:\Program Files (x86)\IBM\isim\config\rdbms\itim_data.ddl
There are 2 ways to go about this:
Use the previous versions of JDBC driver. For example, v126.96.36.199.
Install the latest ISIM fixpack (v.188.8.131.52 or later), then manually run DBConfig