For configuring JDBC adapter on IS page ask your DBA team for details.
Depending on the IS-Version (and therefore the used JVM) and the DB version there are several different driver jars for Oracle DBs (these can be downloaded for free from Oracle Technology Network [free registration required]):
JVM 1.5: ojdbc5.jar
JVM 1.6: ojdbc6.jar
JVM 1.7: ojdbc6.jar (for Oracle 11g and before)
ojdbc7.jar (for Oracle 12c and newer)
These jars are backwards compatible down to Oracle 9i R2 for those running on an old database.
For Oracle Database driver it is sufficient to place the jar in IntegrationServer/packages/WmJDBCAdapter/code/jars and reload the Adapter-Package and all depending packages.
The connection should specify “driverType=thin” in the “Other Properties” field.
Oracle 12c is currently not officially supported for the webMethods Suite.
Also make sure that WmART package is also enabled.
Let me know your results.