Error ORA-12505, TNS:listener does not currently know of SID given in connect descriptor

Question

I have a java code that tries to connect to my oracle database.Below given the code snippet.
I am getting error when I ran this code.
Java code.
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class jdbc {
   public static void main(String[] args) {
     try {
         Class.forName("oracle.jdbc.OracleDriver");
     } catch (ClassNotFoundException e) {
         e.printStackTrace();
         return;
     Connection connection = null;
     try {
         connection = DriverManager.getConnection(
                 "jdbc:oracle:thin:@localhost:1521:XE", "SCOTT",
                 "password");
     } catch (SQLException e) {
         e.printStackTrace();
         return;
Error I am getting is
java.sql.SQLException: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
Can Someone explain me what is wrong here?

Answer 1

Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ip
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tc
Services Summary...
Service "CLRExtProc" has 1 instance(
  Instance "CLRExtProc", status UNKN
Service "PLSExtProc" has 1 instance(
  Instance "PLSExtProc", status UNKN
The command completed successfully
Obviously there is no handler for XE service.
Maybe you changed hostname(this should be "Owner-PC") ?
Try to manually start/stop db and see if there are some errors:
sqlplus / as sysdba
startup
shutdown immediate
If after that you still can't find cause, try to ask on oracle db forum.
Dario