Connecting to Oracle DB with JDBC ...

Question

I receive this err when i run my codes
java.sql.SQLException: Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=150999297)(ERR=12505)(ERROR_STACK=(ERROR=(CODE=12505)(EMFI=4))))
Interactive Session Ended
Below is my codes.
// header - edit "Data/yourJavaHeader" to customize
// contents - edit "EventHandlers/Java file/onCreate" to customize
import java.sql.*;
class MakingTheConnection
     public static void main(String[] args)
          Connection connection = null;
Statement stmt = null;
          try
                    System.out.println("Hello 1");
Class.forName("oracle.jdbc.driver.OracleDriver");
                                             System.out.println("Hello 2");
catch(java.lang.ClassNotFoundException e)
System.err.print("ClassNotFoundException: ");
System.err.println(e.getMessage());
try
                    System.out.println("Hello 2");
//connection = DriverManager.getConnection("jdbc:oracle:thin:@172.20.134.95:1521:SNP", "system", "manager");
                    connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:SNP", "system", "manager");
stmt = connection.createStatement();
          catch(java.sql.SQLException ex)
System.err.print("SQLException: ");
System.err.println(ex.getMessage());
          try
                    System.out.println("Hello 3");
if (stmt!=null)
{stmt.close();}
if (connection!=null)
{connection.close();}
catch(Exception e)
e.printStackTrace();
          //load the driver
          try
               Class.forName("oracle.jdbc.driver.OracleDriver");
               //Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
               String sourceURL = "jdbc:oracle:thin:@172.20.134.95:1521:SNP";
               //String sourceURL = "jdbc:oracle:thin:@172.20.134.95:389:SNP";
               String user = "system";
               String password = "manager";
               Connection databaseConnection = DriverManager.getConnection(sourceURL, user, password);
               System.out.println("connected");
               databaseConnection.close();
          catch (ClassNotFoundException cnfe)
          System.out.println(cnfe);
          catch(SQLException sqle)
          System.err.println(sqle);
Do not uncomment the codes i put as comments coz they are not used :)
I really need help here..thankz.

Answer 1

Hi:
That error code is Service Name related error.
Oracle error docs has the following
TNS-12505 TNS:listener could not resolve SID given in connect descriptor
Cause: The SID in CONNECT_DATA was not found in the listener's tables.
Action: Check to make sure that the SID specified is correct. The SIDs that are currently registered with the listener can be obtained by typing "LSNRCTL SERVICES listener_name". These SIDs correspond to SID_NAMEs in TNSNAMES.ORA, or DB_NAMES in the INIT.ORA file.