Oracle server - client connection question

This is my problem:
Server A : oracle server (behind the firewall)
Server B: the bridge server
Server C: my application is on who need to connect to the database on A
C can not connect to A directly. But it can connect to B. What are my options? If I install an oracle client on B, then can I connect to the client who will connect to the db server on A? Do I need to install a client on C as well? does it work?
Thanks,
Chau

user626162 wrote:
So I need to install the oracle client on C and the Oracle Connection Manager on server B? Would you point me to the document on how to do this?Correct. A good place to start is probably the [Configuring and Administering Oracle Connection Manager|http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/cman.htm#NETAG011] chapter in the Net Services Administrator's Guide.
Justin

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So I need to install the oracle client on C and the Oracle Connection Manager on server B? Would you point me to the document on how to do this?Correct. A good place to start is probably the [Configuring and Administering Oracle Connection Manager|http://download.oracle.com/docs/cd/B19306_01/network.102/b14212/cman.htm#NETAG011] chapter in the Net Services Administrator's Guide.
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Hey guys,
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What I am currently working on is a networked Monopoly game. My part of the assignment is to create a simple game lobby (just GUI based, buttons, action listeners, etc) where players can create games and join games already created.
What I have is this. When a player clicks on the "Create Game" button, an anonomus inner action listener will detect the push and create a hosted game (Server side connection). When a player clicks on the newly created game, they will be a joined player (Client side connection).
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Here are the 3 classes I used. I understand this is probably not the most efficient way to post, but this is the only way you can see what I exactly have. I took out all my GUI stuff to make it easier to follow (if you want me to post full classes I can):
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- Ry
//package Mackopoly;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.BorderLayout;
import java.io.EOFException;
import java.io.IOException;
import java.net.ServerSocket;
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.JFrame;
public class gameList extends JFrame {
    MackPlayer tc1;
    MackPlayer tc2;
    MackPlayer tc3;
    HostPlayer ts1;
    HostPlayer ts2;
    HostPlayer ts3;
    private String temp = ""; //used to display chat area
    private int gameCounter = 0; //number of games created
    private boolean game1Started = false;
    private boolean game2Started = false;
    private boolean game3Started = false;
    public void start()
    //Sets up the screen
        enterField.addActionListener(
        new ActionListener()
            public void actionPerformed(ActionEvent ae)
                if (ae.getSource() == enterField)
                    temp = enterField.getText();
                    chatBox.append(temp + "\n");
                    enterField.setText("");
        createGame.addActionListener(
        new ActionListener()
            public void actionPerformed(ActionEvent ae)
                if (ae.getSource() == createGame)
                    gameCounter++;
                    if(gameCounter == 1)
                        //create a new host game on the server
                        //instanciate an object accordingly
                        game1.setText("Game " + gameCounter + "started!");
                        game1Started = true;
                              ts1 = new HostPlayer();
                        ts1.execute();
                    else if(gameCounter == 2)
                        game2.setText("Game " + gameCounter + "started!");
                        game2Started = true;
                              ts2 = new HostPlayer();
                        ts2.execute();
                    else if(gameCounter == 3)
                        game3.setText("Game " + gameCounter + "started!");
                        game3Started = true;
                              ts3 = new HostPlayer();
                         ts3.execute();
                    else
                        System.out.println("games full");
        joinGame1.addActionListener(
        new ActionListener()
            public void actionPerformed(ActionEvent ae)
                if (ae.getSource() == joinGame1)
                    if(game1Started == false)
                        JOptionPane.showMessageDialog(null,"Start a game!");
                    if(game1Started == true)
                        JOptionPane.showMessageDialog(null,"Joined!");
                        tc1 = new MackPlayer("Game 1");
                        tc1.startClient();
        joinGame2.addActionListener(
        new ActionListener()
            public void actionPerformed(ActionEvent ae)
                if (ae.getSource() == joinGame2)
                    if(game2Started == false)
                        JOptionPane.showMessageDialog(null,"Start a game!");
                    if(game2Started == true)
                         JOptionPane.showMessageDialog(null,"Joined!");
                        tc2 = new MackPlayer("Game 2");
                        tc2.startClient();
        joinGame3.addActionListener(
        new ActionListener()
            public void actionPerformed(ActionEvent ae)
                if (ae.getSource() == joinGame3)
                    if(game3Started == false)
                        JOptionPane.showMessageDialog(null,"Start a game!");
                    if(game3Started == true)
                         JOptionPane.showMessageDialog(null,"Joined!");
                        tc3 = new MackPlayer("Game 3");
                        tc3.startClient();
    }//End start method
}//End of my class
import java.awt.*;
import java.awt.event.*;
import java.net.Socket;
import java.net.InetAddress;
import java.io.IOException;
import javax.swing.*;
import java.util.Formatter;
import java.util.Scanner;
import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;
//Imports necessary packages
public class MackPlayer extends JFrame implements Runnable
//Client class
     private JTextField idField;
     private JTextArea displayArea;
     private JTextField guessArea;
     private JPanel panel2;
     private Socket connection;
     private Scanner input;
     private Formatter output;
     private String Host;
     private String myMark;
     private boolean myTurn;
     private final String X_MARK = "1";
     private final String O_MARK = "2";
     public MackPlayer(String host)
          Host = host;
          displayArea = new JTextArea(10,30);
          displayArea.setEditable(false);
          add(new JScrollPane(displayArea), BorderLayout.SOUTH);
          //Creates the message area
          idField = new JTextField();
          idField.setEditable(false);
          add(idField, BorderLayout.NORTH);
          //Creates the name field
          guessArea = new JTextField(10);
          guessArea.setEditable(false);
          add(new JScrollPane(guessArea), BorderLayout.CENTER);
          //Creates the guess area
          panel2 = new JPanel();
          panel2.add(guessArea, BorderLayout.CENTER);
          add(panel2, BorderLayout.CENTER);
          setSize(350, 275);
          setVisible(true);
          TextHandler tHandler = new TextHandler();
          idField.addActionListener(tHandler);
          guessArea.addActionListener(tHandler);
          //Adds the area's to the handler
          startClient();
     public void startClient()
     //Gets connection and starts thread
          try
               connection = new Socket(InetAddress.getByName(Host), 12345);
               input = new Scanner(connection.getInputStream());
               output = new Formatter(connection.getOutputStream());
          catch(IOException e)
               e.printStackTrace();
          ExecutorService worker = Executors.newFixedThreadPool(1);
          worker.execute(this);
     public void run()
          myMark = input.nextLine();
          SwingUtilities.invokeLater(
          new Runnable()
               public void run()
                    idField.setText("Enter name here");
                    guessArea.setText("Enter guess");
                    //Default text
          );//end call
          myTurn = (myMark.equals(X_MARK));
          while(true)
               if(input.hasNextLine())
                    processMessage(input.nextLine());
     private void processMessage(String message)
     //Handles all possible messages from the server
          if(message.equals("Guess too low."))
               displayMessage("Guess too low\n");
          else if(message.equals("Guess too high."))
               displayMessage("Guess too high\n");
          else if(message.equals("You Win!"))
               displayMessage("You Win!\n");
          else if(message.equals("Other player connected. Your turn."))
               displayMessage("Other player connected. Your turn\n");
               guessArea.setEditable(true);
          else if(message.equals("Name1"))
               displayMessage("Enter your name.\n");
               idField.setEditable(true);
          else if(message.equals("Name2"))
               displayMessage("Enter your name.\n");
               idField.setEditable(true);
          else if(message.equals("Player 2 has entered name"))
               displayMessage("Player 2 has entered name. Your turn\n");
               guessArea.setEditable(true);
          else if(message.equals("Invalid guess, try again"))
               displayMessage(message + "\n");
               myTurn = true;
               guessArea.setEditable(true);
          else if(message.equals("Opponent guessed"))
               int sw = input.nextInt();
               displayMessage("Opponent guessed " + sw);
               sendGuess(sw);
               displayMessage("\nOpponent moved. Your turn.\n");
               guessArea.setEditable(true);
          else if(message.equals("Opponent guessed and won"))
               int sw = input.nextInt();
               displayMessage("Opponent guessed and won with number " + sw);
               sendGuess(sw);
               guessArea.setEditable(false);
          else
               displayMessage(message + "\n");
     private void displayMessage(final String messageToDisplay)
          SwingUtilities.invokeLater(
          new Runnable()
               public void run()
                    displayArea.append(messageToDisplay);
     public void sendGuess(int guess)
          if(myTurn)
               output.format("%d\n", guess);
               output.flush();
     private class TextHandler implements ActionListener
     //Handles the fields
          public void actionPerformed(ActionEvent event)
               if(event.getSource() == idField)
                    idField.setEditable(false);
                    output.format("%s\n", idField.getText());
                    output.flush();
                    myTurn = false;
                    //Sends the name to the server
                    //Sets text to the name and sets it uneditable and sets turn to false
               if(event.getSource() == guessArea)
                    guessArea.setEditable(false);
                    output.format("%s\n", guessArea.getText());
                    output.flush();
                    guessArea.setText("");
                    myTurn = false;
                    //Send the guess to the server
                    //Clears the past guess from the screen
import java.awt.BorderLayout;
import java.net.ServerSocket;
import java.net.Socket;
import java.io.IOException;
import java.util.*;
import javax.swing.*;
import java.util.concurrent.*;
import java.util.concurrent.locks.*;
//Imports necessary packages
public class HostPlayer extends JFrame
//Server class
     private JTextArea outputArea;
     private Player[] players;
     private ServerSocket server;
     private int currentPlayer;
     private final static int PLAYER_1 = 0;
     private final static int PLAYER_2 = 1;
     private final static String[] MARKS = { "1", "2"};
     private ExecutorService runGame;
     private Lock gameLock;
     private Condition otherPlayerConnected;
     private Condition otherPlayerTurn;
     private Random generator = new Random();
     private int randomNumber;
     private String p1Name, p2Name;
     //Variables
     public HostPlayer()
          super("Guessing game");
          //Title of server window
          runGame = Executors.newFixedThreadPool(2);
          //Hanldes up to two clients
          gameLock = new ReentrantLock();
          //The lock
          otherPlayerConnected = gameLock.newCondition();
          otherPlayerTurn = gameLock.newCondition();
          //The condition variables
          players = new Player[2];
          currentPlayer = PLAYER_1;
          //The players
          try
               server = new ServerSocket(12345, 2);
          catch(IOException e)
               e.printStackTrace();
               System.exit(1);
          //Establishes server
          randomNumber = generator.nextInt(10);
          //The number to be guessed 0-10
          outputArea = new JTextArea();
          add(outputArea, BorderLayout.CENTER);
          outputArea.setText("Server awaiting connections \n");
          //The output area
          displayMessage("The number is " + randomNumber + " \n");
          //Prints out what the number is
          setSize(300, 300);
          setVisible(true);
          //Sets the size of the server window
     public void execute()
          for(int i = 0; i < players.length; i++)
               try
                    players[i] = new Player(server.accept(), i);
                    runGame.execute(players);
                    //Runs the threads to handle clients
               catch(IOException e)
                    e.printStackTrace();
                    System.exit(1);
          gameLock.lock();
          try
               players[PLAYER_1].setSuspended(false);
               otherPlayerConnected.signal();
          finally
               gameLock.unlock();
     private void displayMessage(final String messageToDisplay)
     //Function that displays messages
          //Class + method that can update the GUI for threads
          SwingUtilities.invokeLater(
          new Runnable()
               public void run()
                    outputArea.append(messageToDisplay);
     public boolean validateAndMove(int guess, int player)
     //Function that determines what the output should be based on the guess
          while(player != currentPlayer)
          //The player can only guess if it is his turn
               gameLock.lock();
               try
                    otherPlayerTurn.await();
               catch(InterruptedException e)
                    e.printStackTrace();
               finally
                    gameLock.unlock();
          if(correctRange(guess))
          //If the guess is a valid guess
               currentPlayer = (currentPlayer + 1) % 2;
               //Switches player turn
               players[currentPlayer].otherPlayerGuessed(guess);
               gameLock.lock();
               try
                    otherPlayerTurn.signal();
                    //Signals other player
               finally
                    gameLock.unlock();
               return true;
          else
               return false;
     public boolean correctRange(int guess)
     //Tests for a valid guess between 0-10
          if(guess >= 0 && guess <= 10)
               return true;
          else
               return false;
     private class Player implements Runnable
     //Player class
          private Socket connection;
          private Scanner input;
          private Formatter output;
          private int playerNumber;
          private String mark;
          private boolean suspended = true;
          private boolean game = true;
          public Player(Socket socket, int number)
               playerNumber = number;
               mark = MARKS[playerNumber];
               connection = socket;
               try
               //Tries to get the data streams
                    input = new Scanner(connection.getInputStream());
                    output = new Formatter(connection.getOutputStream());
               catch(IOException e)
                    e.printStackTrace();
                    System.exit(1);
          public void otherPlayerGuessed(int guess)
          //Function that detemines whether the guess is too high/low or correct
               if(guess == randomNumber)
                    output.format("Opponent guessed and won\n");
                    output.format("%d\n", guess);
                    output.flush();
               else
                    output.format("Opponent guessed\n");
                    output.format("%d\n", guess);
                    output.flush();
          public void run()
          //The start of the threads, at the beginning messages go back and forth to set up the connection
          //and player names
               try
                    displayMessage("Player " + mark + "connected \n");
                    output.format("%s\n", mark);
                    output.flush();
                    //Sends the message that the player has connected
                    if(playerNumber == PLAYER_1)
                         output.format("%s\n%s", "Player 1 connected ", "Waiting for another player\n");
                         output.flush();
                         gameLock.lock();
                         try
                              while(suspended)
                                   otherPlayerConnected.await();
                                   //Waits for player 2
                         catch(InterruptedException e)
                              e.printStackTrace();
                         finally
                              gameLock.unlock();
                         output.format("Name1\n");
                         output.flush();
                         p1Name = input.nextLine();
                         displayMessage("Player 1 = " + p1Name + "\n");
                         //Sends a message to enter the name and puts the received name
                         //in the variable p1Name
                         output.format("Other player connected. Your turn.\n");
                         output.flush();
                         //Starts the game when the other player has connected
                         //A lot of the turn base is done with message handling
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                         output.format("Name2\n");
                         output.flush();
                         p2Name = input.nextLine();
                         displayMessage("Player 2 = " + p2Name + "\n");
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                                        displayMessage(" \n" p2Name " guess: " + guess);
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                                        displayMessage(" \n" p2Name " guess: " + guess);
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                                   game = false;
                                   //Ends game
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                              output.format("Invalid guess, try again\n");
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                    try
                         connection.close();
                    catch(IOException e)
                         e.printStackTrace();
                         System.exit(1);
          }//End run
          public void setSuspended(boolean status)
               suspended = status;
     }//End player class
}//End Server class


Thanks for the response
I think I understand what you are saying, I just want to make sure I get it fully. I need to create a separate thread that runs just my connection process to make sure that the processes actually occur? If so, how would I go about doing this?
Thanks again

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user13153556 wrote:
Hi Rajesh,
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Thanks for the response
I think I understand what you are saying, I just want to make sure I get it fully. I need to create a separate thread that runs just my connection process to make sure that the processes actually occur? If so, how would I go about doing this?
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OS: Windows NT 4.0 and SP5
Thanks Frank

I had the same problem and I guess you are also hitting the firewall timeout problem... you can enable Oracle DCD (dead connection detection) by setting sqlnet.expire_time in $ORACLE_HOME/network/admin/sqlnet.ora appropriately. This solution I got from http://asktom.oracle.com.
I tried setting the expire_time to 50 minutes less than firewall time-out (which is 60 minutes) but it didn't worked, right now i am trying to figure out what else can cause the problem (I am using Oracle connection pool).... but I think above solution may solve your problem
hello,
i do loos the connection between oracle server an client, because the firewall is between. The firewall will close non active connections an ports after 10 minutes. Only port of one site is clost after 10 minutes then, other site let the port open.
Shares to the the server do in not loos. Only connection to oracle. What can i do !!!!
Oracleversion ist 8.0.6
OS: Windows NT 4.0 and SP5
Thanks Frank

Oracle client picking up wrong port while connecting to oracle server

Hi,
I have an oracle client installed in one of the system. As we know oracle client connects to the server on port 1521, but from my client system every time i try to connect it is taking random ports which are blocked on our firewall, hence not connecting to the server.
Is there any method i can connect with port 1521 only. I have also put the entry in client tnsnames.ora
Thanks in advance
Regds
Kiran

M Kiran Kumar Reddy wrote:
True, Tnsping is working but i am not able to connect to server
my client system TNSNames.ora
LIB =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.228)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
Client to server tns ping result
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.
1.228)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = orcl)))
OK (40 msec)
Edited by: M Kiran Kumar Reddy on Jul 23, 2009 7:42 PMThat's because tnsping goes no further than the listener. There doesn't even have to be a database to get a successful tnsping. And since tnsping only needs to ping the listener (not the database) it only needs port 1521. It's when the listener tries to set up the actual database connection that he will (by default) pick an random port for that connection.

Connection between oracle 9i server and oracle 9i client

hi there,
i have installed both oracle 9i server and oracle 9i client in my system.how can i connect these two to have connection between these server and client?
Because i was using only 9i server for creating database and for other purposes.i have not used 9i client yet.
Please write me the answer.
Thanks in advance.

Hi Balu,
If you have the Oracle 9i Client, you can just edit your TNSNAMES.ora file of your client to have a TNS Entry for your new Database & try connecting it. You just need to try TNSPING & ensure that you can reach the Listener.
Are you facing any specific problems ?
Regards,
Sandeep

Connect to Oracle 9i server using oracle 11g client

Hi,
my oracle 9i server is on unix machine.
I got new Window 7 64 bit machine for .NET code development(framework 4.0).It is having Oracle 11G installed.I am getting oracle connection error while running .NET application.
what changes (connection string/tnsnames.ora/others) will I have to do to connect Oracle 9i server using oracle 11g client ?

Hi,
Please post the complete error stack you are getting.
Regards
Yoonas

Oracle server - client connection question

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