@Prabhu_Muppala  As we see that the netstat command shows no oracle port 1521 opened.     (no output means Oracle is not running on default listerer port  1521. [cloudera@quickstart ~]$ sudo netstat -tnlpa | grep 1521 . Also the following error indicates that your Oracle Database is not successfully running on "localhost:1521" Caused by: oracle.net.ns.NetException: The Network Adapter could not establish the connection at oracle.net.nt.ConnStrategy.execute(ConnStrategy.java:470) So please verify why the oracle DB is not running and configured to use 1521 listener port? Please try to restart Oracle and then recheck if the port 1521 is opened? Or if you have configured to run Oracle on some other port? # netstat -tnlpa | grep $ORACLE_PROCESS_ID   .   ... View more