Kesalahan koneksi localhost Java Oracle (ORA-12505)

Periksa apakah file listener.ora di bawah <ORACLE_HOME>\admin\NETWORK direktori memiliki nilai berikut:

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )