Could servlet broadcast message to connected clients

hi ,
i am working on applet to servlet environment, i want that when my one client applet update the db on servlet, then servlet broadcast message to all connected applet clients.
i will be thankful

Servlets work on a request response process, the only way to broadcast to all clients is for the applet to request any stored messages/broadcasts.
You can store a Collection of messages at the application scope and allow the applets to query a MessageServlet every x minutes or so and the servlet can respond with any messages left behind.
You can try keeping a constant connection open between the servlet and applet however it can get messy.
Another option is to try another java technology like sockets (have a look at some of the chat programs available) or perhaps JavaSpaces may also help you in this respect (but don't quote me on that).
Anthony

Similar Messages

  • Is there any mechanism for broadcast messages for every client?

    Hi, all
    I just wanna to develop such a kind of chatting program. So I just build the communication structure for that. I want to use UDP protocol to send and recieve messages. As we know about that protocol, it does not need connection between server and client, so some packages will be lost. I just used only one DatagramSocket to recieve and send any messages back and forth. And I implemented the client using multithread technique. The problem is that when multiple client sent messages to server, how could server broadcast the specific message to all clients. I am very headache about that. I just used Vector to store diffrent address and port. And when a meesage arrived, I will firstly make ajustment about whether the address and port had been stored, if not, I will add, otherwise I will ignore it. So I think it will be terrible that if thousands of clients connected to the server, how big Vector will be. So I want to know whether the Net package or DatagramSocket provided some kind of mechanism about broadcast messages for every interested client. Thanks. Here is my code below:
    ChattingServer.java
    * Created on 2005-4-16
    * TODO To change the template for this generated file go to
    * Window - Preferences - Java - Code Style - Code Templates
    // A server that echoes datagrams
    import java.net.*;
    import java.io.*;
    import java.util.*;
    * @author Kevin
    * TODO To change the template for this generated type comment go to
    * Window - Preferences - Java - Code Style - Code Templates
    public class ChattingServer {
         static final int INPUT = 1066;
         private byte[] buf = new byte[1000];
         private DatagramPacket dp = new DatagramPacket(buf, buf.length);
         private DatagramSocket socket;
         private Vector addrVector, portVector;
         public ChattingServer() {
              try {
                   System.out.println("Chatting Server Started......");
                   socket = new DatagramSocket(INPUT);
                   System.out.println("The status is: " + socket.getBroadcast());
                   addrVector = new Vector();
                   portVector = new Vector();
                   socket.receive(dp);
                   addrVector.addElement(dp.getAddress());
                   portVector.addElement(new Integer(dp.getPort()));
                   System.out.println("The original size of addrVector: " + addrVector.size());
                   System.out.println("The original size of portVector: " + portVector.size());
                   String first = Transfer.toString(dp);
                   System.out.println(first);
                   System.out.println("The info: " + dp.getAddress() + ": " + dp.getPort());
                   DatagramPacket echo = Transfer.toDatagram(first, dp.getAddress(), dp.getPort());
                   socket.send(echo);
                   while(true) {
                        socket.receive(dp);
                        System.out.println("A message recieved and prepare for broadcasting.....");
                        for(int i = 0; i < addrVector.size(); i++){
                             if(!((((InetAddress)(addrVector.elementAt(i))).toString() == (dp.getAddress()).toString()) && (((Integer)portVector.elementAt(i)).toString() == (new Integer(dp.getPort())).toString()))) {
                                  System.out.println("Before adding element");
                                  System.out.println("(InetAddress)(addrVector.elementAt(i)).toString(): " + ((InetAddress)(addrVector.elementAt(i))).toString() + ", dp.getAddress().toString(): " + (dp.getAddress()).toString());
                                  System.out.println("(Integer)portVector.elementAt(i).toString(): " + ((Integer)portVector.elementAt(i)).toString() + ", (new Integer(dp.getPort())).toString()" + (new Integer(dp.getPort())).toString());
                                  addrVector.addElement(dp.getAddress());
                                  portVector.addElement(new Integer(dp.getPort()));
                        String info = dp.getAddress() + ": " + dp.getPort();
                        String rcvd = info + ": " + Transfer.toString(dp);
                        System.out.println(rcvd);
                        System.out.println("The size of addrVector is: " + addrVector.size());
                        System.out.println("The size of portVector is: " + portVector.size());
                        String echoString = Transfer.toString(dp);
                        for(int i = 0; i < addrVector.size(); i++) {
                             InetAddress tempAddr = (InetAddress)addrVector.elementAt(i);
                             int tempPort = Integer.parseInt(portVector.elementAt(i).toString());
                             System.out.println("The port is: " + tempPort);
                             echo = Transfer.toDatagram(echoString, tempAddr, tempPort);
                             socket.send(echo);
              } catch(SocketException e) {
                   System.err.println("Can't open socket");
                   System.exit(1);
              } catch(IOException e) {
                   System.err.println("Communication error");
                   e.printStackTrace();
         public static void main(String[] args) {
              new ChattingServer();
    ChattingClient.java
    * Created on 2005-4-16
    * TODO To change the template for this generated file go to
    * Window - Preferences - Java - Code Style - Code Templates
    // Tests the ChattingServer by starting multiple clients, each of which sends datagrams.
    import java.lang.Thread;
    import java.net.*;
    import java.io.*;
    * @author Kevin
    * TODO To change the template for this generated type comment go to
    * Window - Preferences - Java - Code Style - Code Templates
    class Sender extends Thread {
         private DatagramSocket s;
         private InetAddress hostAddress;
         public Sender(DatagramSocket s) {
              this.s = s;
              try {
                   hostAddress = InetAddress.getByName(null);
              } catch(UnknownHostException e) {
                   System.err.println("Can not find host");
                   System.exit(1);
              System.out.println(" Welcome ChattingDemo..........");
              System.out.println("Please input your name&#65306; ");
         public void run() {
              try {
                   String strSent;
                   BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));
                   String name = rd.readLine();
                   while(true) {
                        System.out.print(name + ": ");
                        strSent = rd.readLine();
                        if(strSent == "END") break;
                        s.send(Transfer.toDatagram(strSent, hostAddress, ChattingServer.INPUT));
                        sleep(100);
                   System.exit(1);
              } catch(IOException e) {
              } catch(InterruptedException e) {
    public class ChattingClient extends Thread {
         private static DatagramSocket s, srv;
         private byte[] buf = new byte[1000];
         private DatagramPacket dp = new DatagramPacket(buf, buf.length);
         public ChattingClient(DatagramSocket s) {
              this.s = s;
         public void run() {
              try {
                   while(true) {
                        s.receive(dp);
                        String rcvd = Transfer.toString(dp);
                        System.out.println(rcvd);
                        sleep(100);
              } catch(IOException e) {
                   e.printStackTrace();
                   System.exit(1);
              }catch(InterruptedException e) {
         public static void main(String[] args) {
              try {
                   srv = new DatagramSocket();
              } catch(SocketException e) {
                   System.err.println("Can not open socket");
                   e.printStackTrace();
                   System.exit(1);
              new ChattingClient(srv).start();
              new Sender(srv).start();
    }

    Hello Amir,
    ACS used to tie the license to the MAC address of the machine but I believe Cisco removed that in version 5.1 or 5.2 as users were facing with issues if the MAC changed on a virtual machine. 
    Other Cisco products, such as the ASA, Call Manger, and even ISE are a lot more restrictive when it comes to licensing. However, Cisco in general has many products that are licensed on the "honor system" where you are responsible for reporting and paying for everything that you are using. 
    Also, I suppose Cisco could audit any companies out there and figure out what the company is using vs what it actually paid for :)
    I hope this helps!
    Thank you for rating helpful posts!

  • My simple chat server does not send messages to connected clients

    Hi!
    I´m developing a chat server. But I can not get it work. My client seems to make a connection to it, but my server does not send the welcome message it is supposed to send when a client connects. Why not?
    removedEdited by: Roxxor on Nov 24, 2008 10:36 AM

    Ok, I solved my previous problem and now I have got a new really annoying one.
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    import javax.microedition.io.*;
    import javax.microedition.midlet.*;
    import javax.microedition.lcdui.*;
    import java.lang.Character;
    import java.io.OutputStream;
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         private Vector connection = new Vector();          
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         private Command mStart = new Command("Start", Command.SCREEN, 0);
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         SocketConnection sc;
         PrintStream out;
         public ChatServer()
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              start_serverForm.addCommand(mStart);
              start_serverForm.setCommandListener(this);
              tf_port.setMaxSize(5);
              textForm.addCommand(mDisconnect);
              textForm.setCommandListener(this);
         public void startApp()
              disp = Display.getDisplay(this);
              disp.setCurrent(start_serverForm);
         public void pauseApp()
         public void destroyApp(boolean unconditional)
         public void commandAction(Command c, Displayable s)
              if(c == mExit)
                   destroyApp(false);
                   notifyDestroyed();
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                   Thread tr = new Thread(this);
                   tr.start();
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                   try
                        sc.close();                              
                   catch(IOException err) { System.out.println("IOException error: " + err.getMessage()); }
                   destroyApp(false);
                   notifyDestroyed();
         public void run()
              try
                   disp.setCurrent(textForm);
                   ssc = (ServerSocketConnection)Connector.open("socket://:2000");
                   while(true)               
                        sc = (SocketConnection) ssc.acceptAndOpen();     
                        connection.addElement(sc);                                                  
                        out = new PrintStream(sc.openOutputStream());
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                        ServerToClient stc = new ServerToClient(sc);
                        stc.start();
              catch(IOException err) { System.out.println("IOException error: " + err.getMessage()); }
              catch(NullPointerException err) { System.out.println("NullPointerException error: " + err.getMessage()); }
         class ServerToClient extends Thread
              String message;
              InputStream in;
              SocketConnection sc;
              ServerToClient(SocketConnection sc)
                   this.sc = sc;
              public void run()
                   try
                        in = sc.openInputStream();
                        int ch;
                        while((ch = in.read())!= -1)                         
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                             char cha = (char)ch;                              
                             String str = String.valueOf(cha);                    
                             out.print(str);
                             //broadcast(str);
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                        //out.close();
                           sc.close();
                   catch(IOException err) { System.out.println("IOException error: " + err.getMessage()); }
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    ===========================================================
    Please help resolving the issue.
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    Hi
    I am also getting the same error can some one help me out
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         at oracle.apps.fnd.framework.CreateIcxSession.getEncryptedSessId(CreateIcxSession.java:144)
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         at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:139)
         at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
         at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:465)
         at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:379)
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         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
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         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
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    ## Detail 0 ##
    oracle.apps.fnd.framework.OAException: Application: FND, Message Name: FND_GENERIC_MESSAGE. Tokens: MESSAGE = java.sql.SQLException: ORA-00904: "SERVERRESP_ENABLED_FLAG": invalid identifier
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         at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:379)
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         at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:727)
         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
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         at oracle.apps.fnd.profiles.ExtendedProfileStore.getSpecificProfileFromDB(ExtendedProfileStore.java:210)
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         at oracle.apps.fnd.profiles.ExtendedProfileStore.getSpecificProfileFromDB(ExtendedProfileStore.java:210)
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         at oracle.apps.fnd.common.AppsContext.initializeContext(AppsContext.java:827)
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         at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
         at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:465)
         at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:379)
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         at oracle.apps.fnd.framework.server.OAUtility.getWebAppsContext(OAUtility.java:352)
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         at oracle.jsp.runtime.HttpJsp.service(HttpJsp.java:139)
         at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
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         at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:379)
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         at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:727)
         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
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         at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:622)
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         at oracle.apps.fnd.profiles.ExtendedProfileStore.getSpecificProfile(ExtendedProfileStore.java:169)
         at oracle.apps.fnd.profiles.ExtendedProfileStore.getMultiSpecificProfileFromDB(ExtendedProfileStore.java:368)
         at oracle.apps.fnd.common.WebAppsContext.setProfileValues(WebAppsContext.java:4177)
         at oracle.apps.fnd.common.AppsContext.setDBEnv(AppsContext.java:3407)
         at oracle.apps.fnd.common.AppsContext.getPrivateConnectionFinal(AppsContext.java:2508)
         at oracle.apps.fnd.common.AppsContext.getPrivateConnection(AppsContext.java:2398)
         at oracle.apps.fnd.common.AppsContext.getJDBCConnection(AppsContext.java:2257)
         at oracle.apps.fnd.common.AppsContext.getJDBCConnection(AppsContext.java:2072)
         at oracle.apps.fnd.common.AppsContext.getJDBCConnection(AppsContext.java:1976)
         at oracle.apps.fnd.profiles.Profiles.getConnection(Profiles.java:2494)
         at oracle.apps.fnd.profiles.Profiles.getProfileOption(Profiles.java:1304)
         at oracle.apps.fnd.profiles.Profiles.getProfile(Profiles.java:384)
         at oracle.apps.fnd.profiles.ExtendedProfileStore.getSpecificProfileFromDB(ExtendedProfileStore.java:210)
         at oracle.apps.fnd.profiles.ExtendedProfileStore.getSpecificProfile(ExtendedProfileStore.java:169)
         at oracle.apps.fnd.profiles.ExtendedProfileStore.getProfile(ExtendedProfileStore.java:148)
         at oracle.apps.fnd.common.logging.DebugEventManager.configureUsingDatabaseValues(DebugEventManager.java:1147)
         at oracle.apps.fnd.common.logging.DebugEventManager.configureLogging(DebugEventManager.java:1008)
         at oracle.apps.fnd.common.logging.DebugEventManager.internalReinit(DebugEventManager.java:977)
         at oracle.apps.fnd.common.logging.DebugEventManager.reInitialize(DebugEventManager.java:944)
         at oracle.apps.fnd.common.logging.DebugEventManager.reInitialize(DebugEventManager.java:931)
         at oracle.apps.fnd.common.AppsLog.reInitialize(AppsLog.java:570)
         at oracle.apps.fnd.common.AppsContext.initLog(AppsContext.java:873)
         at oracle.apps.fnd.common.AppsContext.initializeContext(AppsContext.java:858)
         at oracle.apps.fnd.common.AppsContext.initializeContext(AppsContext.java:827)
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         at oracle.apps.fnd.common.WebAppsContext.<init>(WebAppsContext.java:846)
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         at oracle.apps.fnd.framework.CreateIcxSession.getEncryptedSessId(CreateIcxSession.java:144)
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         at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
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         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
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         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
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         at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:497)
         at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:418)
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         at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
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         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
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         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
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         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
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         at oracle.apps.fnd.framework.webui.OAPageBean.preparePage(OAPageBean.java:497)
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         at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java:56)
         at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:317)
         at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:465)
         at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:379)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
         at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:727)
         at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:306)
         at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:767)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:259)
         at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:106)
         at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:803)
         at java.lang.Thread.run(Thread.java:534)

    Welcome to the forums !
    What is "custoaf" ? Pl post details of OS and EBS versions.
    Pl see if these MOS Docs can help
    313760.1 - OAException Error FND-INVALID APPLICATION Occurs When Running The JDeveloper Tutorial
    461485.1 - Error FND-INVALID APPLICATION Occurs When Running custom eBiz pages from JDeveloper
    HTH
    Srini

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