Install a JDBC driver (jar files)
1/ Place the Java classes for the JDBC driver in a location that Integration Server can
access, typically the server’s classpath.
To place the classes in the server’s classpath, place the .zip or .jar file containing the
classes in the
Integration Server_directory\instances\instance_name\packages\WmJDBCAdapter\co
de\jars directory.
2/ Restart Integration Server.
The server automatically adds the .zip or .jar libraries to its classpath after the restart.
I suggest using ojdbc7.jar from 12.1.0.2 as this should match the current versions of Oracle.
When placing the jar in the location suggested by Mahesh reloading the package WmJDBCAdapter is sufficient.
The error message indicates an issue with the provided values for serverName, port and SID.
Please check these values for leading and trailing spaces and correct these.