java - ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

Question

I have problem, when trying to connect to Oracle Database XE via listener:

 sqlplus system/my_password@XE

I get the following error:

ORA-12514: TNS:listener does not currently know of service requested in connect
descriptor

I use Ubuntu 12.10 and Oracle Express Edition 11g.

My main goal to connect java + oracle db with jdbc, but there i get the same error.

Here are my listener.ora

# listener.ora Network Configuration File:

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /u01/app/oracle/product/11.2.0/xe)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      (ADDRESS = (PROTOCOL = TCP)(HOST = watson)(PORT = 1521))
    )
  )

DEFAULT_SERVICE_LISTENER = (XE)

and tnsnames.ora

# tnsnames.ora Network Configuration File:

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

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )

and

lsnrctl service

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 04-FEB-2014 17:01:44
Copyright (c) 1991, 2011, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
The command completed successfully

Answer 1

I had to restart my OracleServiceXE service in windows services and it was working again.