Problem running remote client.

Question

Hi,
I'm trying to use remoting and have come across a problem and i was hoping someone could help me out.
When i try to run my Server App. I get the following Error:
Connection refused to host: localHost; nested exception is:
java.net.ConnectException: Connection refused: connect
My runService class is : -
package DAO;
import java.rmi.*;
public class runService {
     * @param args the command line arguments
    public static void main(String[] args) {
       try
         {Naming.rebind("//localHost:8100/dataAccess", new DataAccessObjectImpl());
          System.out.println( "Data Access Server is ready" );
         catch(Exception e){
         System.out.println(e.getMessage());}
}I have trimmed the classes down to three methods as the post can only have 5000 :)
the DataAccessObject interface is : -
package DAO;
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.sql.*;
import com.sun.rowset.CachedRowSetImpl;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface dataAccessObject extends Remote{
    public String generateConnectionString()throws RemoteException  ;
    public String getUserPassword(String username)throws RemoteException  ;
    public void ExecuteDML(String username, String sql)throws RemoteException  ;
   }the DataAccessObjectImpl class reads as : -
package DAO;
import java.sql.*;
import java.util.Properties;
import java.io.*;
import com.sun.rowset.CachedRowSetImpl;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.*;
import java.rmi.server.*;
public class DataAccessObjectImpl extends UnicastRemoteObject implements dataAccessObject{
Connection conn ;
    String  driver = "oracle.jdbc.driver.OracleDriver";
    CachedRowSetImpl ds ;
    String theString;
    int theNumber;
    Date theDate;
    ResultSet rs;
    String theConnectionURL;
    String thePassword;
    public DataAccessObjectImpl() throws RemoteException{
    public String generateConnectionString() throws RemoteException  {
        Properties configFile = new Properties();
        try {
            configFile.load(this.getClass().getClassLoader().getResourceAsStream("app_config.properties"));
        } catch (IOException error) {
            throw new RemoteException(error.getMessage());
        String connection = configFile.getProperty("JTSTORESConnection");
        return connection;
    public String getUserPassword(String username)throws RemoteException  {
        Properties configFile = new Properties();
        try {
            configFile.load(this.getClass().getClassLoader().getResourceAsStream("app_config.properties"));
        } catch (IOException error) {
            throw new RemoteException(error.getMessage());
        String pwd = configFile.getProperty(username.toUpperCase() + "_PWD");
        return pwd;
    public void ExecuteDML(String username, String sql) throws RemoteException  {
        try {
            Class.forName(driver); // load Oracle driver
            theConnectionURL = generateConnectionString();
            thePassword = getUserPassword(username);
            conn = DriverManager.getConnection(theConnectionURL, username, thePassword);
            Statement s = conn.createStatement();
            s.executeUpdate(sql);
            conn.commit();
            s.close();
            conn.close();
        } catch (SQLException error) {
            throw new RemoteException(error.getMessage());
        } catch (ClassNotFoundException error) {
            throw new RemoteException(error.getMessage());
   If anyone can enlighten me unto what is happening i would be very grateful
thanks
James

Answer 1

Hi,
I'm trying to use remoting and have come across a problem and i was hoping someone could help me out.
When i try to run my Server App. I get the following Error:
Connection refused to host: localHost; nested exception is:
java.net.ConnectException: Connection refused: connect
My runService class is : -
package DAO;
import java.rmi.*;
public class runService {
     * @param args the command line arguments
    public static void main(String[] args) {
       try
         {Naming.rebind("//localHost:8100/dataAccess", new DataAccessObjectImpl());
          System.out.println( "Data Access Server is ready" );
         catch(Exception e){
         System.out.println(e.getMessage());}
}I have trimmed the classes down to three methods as the post can only have 5000 :)
the DataAccessObject interface is : -
package DAO;
* To change this template, choose Tools | Templates
* and open the template in the editor.
import java.sql.*;
import com.sun.rowset.CachedRowSetImpl;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface dataAccessObject extends Remote{
    public String generateConnectionString()throws RemoteException  ;
    public String getUserPassword(String username)throws RemoteException  ;
    public void ExecuteDML(String username, String sql)throws RemoteException  ;
   }the DataAccessObjectImpl class reads as : -
package DAO;
import java.sql.*;
import java.util.Properties;
import java.io.*;
import com.sun.rowset.CachedRowSetImpl;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.*;
import java.rmi.server.*;
public class DataAccessObjectImpl extends UnicastRemoteObject implements dataAccessObject{
Connection conn ;
    String  driver = "oracle.jdbc.driver.OracleDriver";
    CachedRowSetImpl ds ;
    String theString;
    int theNumber;
    Date theDate;
    ResultSet rs;
    String theConnectionURL;
    String thePassword;
    public DataAccessObjectImpl() throws RemoteException{
    public String generateConnectionString() throws RemoteException  {
        Properties configFile = new Properties();
        try {
            configFile.load(this.getClass().getClassLoader().getResourceAsStream("app_config.properties"));
        } catch (IOException error) {
            throw new RemoteException(error.getMessage());
        String connection = configFile.getProperty("JTSTORESConnection");
        return connection;
    public String getUserPassword(String username)throws RemoteException  {
        Properties configFile = new Properties();
        try {
            configFile.load(this.getClass().getClassLoader().getResourceAsStream("app_config.properties"));
        } catch (IOException error) {
            throw new RemoteException(error.getMessage());
        String pwd = configFile.getProperty(username.toUpperCase() + "_PWD");
        return pwd;
    public void ExecuteDML(String username, String sql) throws RemoteException  {
        try {
            Class.forName(driver); // load Oracle driver
            theConnectionURL = generateConnectionString();
            thePassword = getUserPassword(username);
            conn = DriverManager.getConnection(theConnectionURL, username, thePassword);
            Statement s = conn.createStatement();
            s.executeUpdate(sql);
            conn.commit();
            s.close();
            conn.close();
        } catch (SQLException error) {
            throw new RemoteException(error.getMessage());
        } catch (ClassNotFoundException error) {
            throw new RemoteException(error.getMessage());
   If anyone can enlighten me unto what is happening i would be very grateful
thanks
James