connecting oracle 8i with datasource method giving exception

Question

I only have Oracle 8i installed in my system working fine. I can successfully connect using jdbc to it using driverManager but the problem occurs when I am using OracleDataSource to connect to it. It says Oracle not Available. I guess I am doing something wrong in providing the sid.

Part of my code -

       OracleDataSource ds = new OracleDataSource();
        ds.setDriverType("thin");
        ds.setServerName("localhost");
        ds.setPortNumber(1521);
        ds.setDatabaseName("ORCL0"); // sid
        ds.setUser("scott");
        ds.setPassword("tiger");
       Connection conn = ds.getConnection();

tnsnames.ora entry (part of it) -

 ORACLE =
   (DESCRIPTION =
    (ADDRESS_LIST =
     (ADDRESS = (PROTOCOL = TCP)(HOST = guddus-comp)(PORT = 1521))
   )
     (CONNECT_DATA =
     (SERVICE_NAME = oracle)
  )
 )

listener.ora entry (part of it) -

SID_LIST_LISTENER =
(SID_LIST =
  (SID_DESC =
    (SID_NAME = PLSExtProc)
    (ORACLE_HOME = C:\oracle\ora92)
    (PROGRAM = extproc)
  )
  (SID_DESC =
    (GLOBAL_DBNAME = oracle)
    (ORACLE_HOME = C:\oracle\ora92)
    (SID_NAME = ORCL0)
  )
  (SID_DESC =
  (GLOBAL_DBNAME = dbabhi)
  (ORACLE_HOME = C:\oracle\ora92)
  (SID_NAME = DBABHI)
  )
)

---

In my code I'v tried oracle, orcl also in place of ORCL0 but anything other than ORCL0 gives Io exception: Connection refused whereas providing ORCL0 gives Exception - ORA-01034: ORACLE not available.... So I guess ORCL0 is correct but I anticipate some other problem.