User principal and key tab file names. Please make sure key tab files are in the respective folder.
String principal = System.getProperty("kerberosPrincipal", "hbaseuser@EXAMPLE.COM");
String keytab = System.getProperty("kerberosKeytab", "/path_to_keytab/hbase-client.keytab");
The essential Kerberos configuration information is the default realm and the default KDC. As with most Kerberos installations, a Kerberos configuration file krb5.conf is consulted to determine such things as the default realm and KDC. The default location is /etc/krb5.conf (Linux).
If the krb5.conf file is in a different location or you want to pass custom krb5.conf: