Error during upgrade to 15.4.1

Document ID : KB000113194
Last Modified Date : 05/09/2018
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The upgrade fails with this error: /opt/clarity/UPGRADE_15/install.xml:1654: java.sql.SQLNonTransientConnectionException: [CA Clarity][Oracle JDBC Driver]Error establishing socket to host and port: localhost:1521. Reason: Connection refused Not sure where "localhost" is even coming from. The properties.xml db references for both the dwhDatabaseServer and databaseServer tags are not "localhost". We both need to know how to fix this, and if we need to restore the database and start over or if we can pick up where we left off. completion.log install.setup= upgrade.attention= process.15.1.0.start=14.4.0 process.15.1.0.finish=completed process.15.2.0.start=15.1.0
Oracle DB serverĀ 
The useURL property value in properties.xml was set to "true" so the installer was looking for the url property and since this was missing it used the default 'localhost' value for the DB Server hostname.
We changed the useURL property value in properties.xml from "true" to "false" and the installer was able to connect to the DWH DB server host.