2323119 - Error: "com.sap.sql.log.OpenSQLException: JDBC driver not supported for ORACLE database." during CREATE-SHADOW-ALIASES phase of Software Update Manager

During the upgrade of a SAP NetWeaver system using Oracle Database 12c, the following error occurs during phase CREATE-SHADOW-ALIASES:

May 20, 2016 5:40:12 PM [Error ]: Return code condition success evaluated to false for process java for action runhandler.

May 20, 2016 5:40:12 PM [Error ]: The following problem has occurred during step execution: com.sap.sdt.db.dmtif.DMTProcessException: Could not complete DMT process. Check the DMT.DROP_ALIAS.LOG log file.
Could not execute DMT command runhandler with arguments /upgrade/SUM/sdt/config/DMT.DROP_ALIAS.xml.
Return code condition success evaluated to false for process java for action runhandler.
.

The DMT.DROP_ALIAS_01_01.ERR log has the following lines:

Execution failed: Program has finished with error. Exit code: 1
Execution has been terminated. More information can be found in the log file /upgrade/SUM/sdt/log/DMT.DROP_ALIAS_01.LOG.
Could not execute DMT command runhandler. See previous messages.
Could not execute the list of statements.
Could not set up a database connection. See previous messages.
Could not establish open SQL connection. Exception com.sap.sql.log.OpenSQLException: Exception of type com.sap.sql.log.OpenSQLException caught: JDBC driver not supported for ORACLE database...
com.sap.sql.log.OpenSQLException: Exception of type com.sap.sql.log.OpenSQLException caught: JDBC driver not supported for ORACLE database..
com.sap.sql.log.OpenSQLException: JDBC driver not supported for ORACLE database.
com.sap.sql.log.OpenSQLException: JDBC driver not supported for ORACLE database.

Return code: 1

• SAP NetWeaver
• Oracle Database 12c

KBA , BC-UPG-TLS-TLJ , Upgrade tools for Java , Problem