How to Fix "Exception in thread "main" java.sql.SQLException: ORA-12505: TNS:listener does n ot currently know of SID given in connect descriptor" Error

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JDBC

i am trying to Exceute this code:

import java.sql.DatabaseMetaData;
import java.sql.Connection;
import java.sql.DriverManager; 
import java.sql.SQLException;

public class ConnectionDemo{ 
      public static void main(String args[])throws ClassNotFoundException, SQLException{
Connection con = null; 
String driverClass = "oracle.jdbc.driver.OracleDriver"; 
String dburl = "jdbc:oracle:oci:@localhost:1521:orcl"; 
String dbuser = "scott"; 
String dbpassword = "tiger"; 
Class.forName(driverClass); 
con = DriverManager.getConnection(dburl, dbuser, dbpassword); 
if(con== null){ 
System.out.println("Not Connected to DataBase"); 
return; 
} 
DatabaseMetaData dm = con.getMetaData();
String pn = dm.getDatabaseProductName(); 
String pv = dm.getDatabaseProductVersion(); 
System.out.println("Connected to : "+pn); 
System.out.println("Version of DataBase is : "+pv); 
con.close();

  }
}

the above programe is compiled successfully. i have also set the classpath to : ojdbc6.jar file but when i am executing this code i am getting this Error:

Exception in thread "main" java.sql.SQLException: ORA-12505: TNS:listener does n ot currently know of SID given in connect descriptor

    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java
:112) at oracle.jdbc.driver.T2CConnection.checkError(T2CConnection.java:672) at oracle.jdbc.driver.T2CConnection.logon(T2CConnection.java:346) at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java: 414) at oracle.jdbc.driver.T2CConnection.(T2CConnection.java:132) at oracle.jdbc.driver.T2CDriverExtension.getConnection(T2CDriverExtensio n.java:78) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801) at java.sql.DriverManager.getConnection(DriverManager.java:582) at java.sql.DriverManager.getConnection(DriverManager.java:185) at ConnectionDemo.main(ConnectionDemo.java:15)

NOTE: i have updated my Windows XP os from microsoft website and after that i am getting this problem. prior to update my Every database programs were executing successfully but after updation of this windows i am getting this problem.
please provide me solution as soon as possible.

[Edit]Code block added[/Edit]