Question

Possible Duplicate:
Java Oracle localhost connection error (ORA-12505)

When I try to connect to Oracle 10g Express Edition, it gives me error:

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
The Connection descriptor used by the client was:
localhost:1521:xe

My sample code:

    Class.forName("oracle.jdbc.OracleDriver");
    Connection connection = null;
    connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "mk119", "mk119");
    Statement stmt = connection.createStatement();

In database:

SQL> connect mk119
Enter password:
Connected.
SQL> ed
Wrote file afiedt.buf

  1* select sys_context('userenv', 'instance_name') from dual
SQL> /

SYS_CONTEXT('USERENV','INSTANCE_NAME')
----------------------------------------------------------------------

xe

SQL>

Please help me on this.

EDIT: Stacktrace:

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
The Connection descriptor used by the client was:
localhost:1521:xe

        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:261)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:387)
        at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:414)
        at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:165)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)
        at java.sql.DriverManager.getConnection(DriverManager.java:579)
        at java.sql.DriverManager.getConnection(DriverManager.java:221)
        at fingerprint.DatabaseTest.main(DatabaseTest.java:14)

EDIT: Complete Code:

import java.sql.*;

public class DatabaseTest {
    public static void main(String [] args){
        try{
            Class.forName("oracle.jdbc.OracleDriver");
            Connection connection = null;
            connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe", "mk119", "mk119");
            Statement stmt = connection.createStatement();
            System.out.println("Connection created");
            stmt.close();
            connection.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

Answer 1

As per the answer provided here, check the following (answer is the one from the related, maybe duplicate, question):

“Check if listener.ora file under the \admin\NETWORK directory has the following value:

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

“

Therefore check your connection url: host, port, sid, to make sure it is properly set.