How to run a datagram socket client and server program

hi,
I am new to socket programming. I am following the tutorial of sun for socket programming...The link is
http://java.sun.com/docs/books/tutorial/networking/datagrams/clientServer.html
I have understood the concept, but the problem is i cannot run the program. I am using netbeans and i have created a package and stored the files QuoteServer,QuoteServerThread, QuoteClient in this package. How can i make the server program run first and then client program in netbeans
kindly help me
Thankyou

I think you are trying to run both server and client
on one machine!!!
It is impossible, your server is blocking the port to
send packets, so you must run client on another
computer!!!It's not impossible to run a client and server on the same machine just for testing or as a demo. Just have the server listen on one port and the client use a different port.
No need to use 2 seperate computers. I've done it one computer before without a problem.
Nick

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How to handle when Client and server write to the socket at the same time

Hi all,
I'm writing a socket communication when client and server may write information the the socket at the same time. I look every where but the samples from the internet only shows example of server replies to client after receiving requests from clients.
Let's say that:
Client 1 ->Socket 1 -> Server 1
Now if there are two threads in the server, one blocked waiting for the input from client on socket 1, the second one write something on the socket to client 1, is it possible?
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hi
thanks for ur reply.
I didnt get any error msg while getting the back the datas.
Actually i divided my application into two parts.
My application will act as both server and client.
server ll get the browser request and send to the client and the client will send that data to the c++ server.
Im able to do that.and unable to get the data from server.
Didnt get any error.
can u tell me how to make an application to act as both client and server.
I think im wrong in that part.
thanks a lot

How to run a sample Jolt client

Can any one explain me how to run a sample jolt client.
Iam trying to run the following jolt client code ToUpper.java at the command prompt but I am getting the following error.I am getting the same error when i run the Jrepository Applet RE.html.
D:\ToUpper>javac ToUpper.java
D:\ToUpper>java ToUpper
bea.jolt.SessionException: Cannot connect to any //localhost:3050.
Reason:NwHdlr: Network Error: chkauth: J_CHECKAUTH FAILED
at bea.jolt.JoltSessionAttributes.getDomainInfoJoltSessionAttributes.java:584)
at bea.jolt.JoltSessionAttributes.checkAuthenticationLevel(JoltSessionAttributes.java:507)
at ToUpper.main(ToUpper.java:20).
I have the tlistener running and provided apppassword and userpassword as my System login password where I have the complete Tuxedo Installation(server and client). Please see the attached sample jolt client program I am trying to run. I am not sure what configuration Settings I need to do.
ToUpper.java
/* Copyright 1996 BEA Systems, Inc. All Rights Reserved */
import bea.jolt.*;
public class ToUpper
public static void main (String[] args)
JoltSession session;
JoltSessionAttributes sattr;
JoltRemoteService toupper;
JoltTransaction trans;
String userName=null;
String userPassword=null;
String appPassword=null;
String userRole="myapp";
String outstr;
          try{
sattr = new JoltSessionAttributes();
sattr.setString(sattr.APPADDRESS, "//GVC3ZA03TESTING:3050");
switch (sattr.checkAuthenticationLevel())
case JoltSessionAttributes.NOAUTH:
break;
case JoltSessionAttributes.APPASSWORD:
appPassword = "123456"//"appPassword";
break;
case JoltSessionAttributes.USRPASSWORD:
userName = "myname";
userPassword = "123456";
appPassword = "123456";
break;
sattr.setInt(sattr.IDLETIMEOUT, 300);
session = new JoltSession(sattr, userName, userRole,
userPassword, appPassword);
toupper = new JoltRemoteService ("TOUPPER", session);
toupper.setString("STRING", "hello world");
toupper.call(null);
outstr = toupper.getStringDef("STRING", null);
if (outstr != null)
System.out.println(outstr);
session.endSession();
System.exit(0);
          }catch(Exception e){
          e.printStackTrace();
} // end main
} // end ToUpper

Hi Todd,
I am not getting the jcheckauthentication error now as i changed the port no. to the port where JSL is running.Now I am getting this error.Also find the ULOG contents pasted below.
D:\bea\tuxedo9.1\samples\jolt\ToUpper>java ToUpper
Authentication Level set To :0
Exception caught error no is:6
bea.jolt.ServiceException: TPENOENT - no entry found
at bea.jolt.JoltRemoteService.decodeCALL(JoltRemoteService.java:460)
at bea.jolt.JoltRemoteService.call(JoltRemoteService.java:345)
at bea.jolt.JoltRemoteService.call(JoltRemoteService.java:267)
at ToUpper.main(ToUpper.java:39)
I have checked the jrepository file and also the Applet window for the service defination(TOUPPER)but still its not recognizing the service.Is there some configuration thing I have missed out before running JOLT client.
ULOG File Contents
132947.GVC3ZA03TESTING!JSH.4000.2464.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name ''; client name 'myapp'"
132956.GVC3ZA03TESTING!WSL.432.5308.0: WSNAT_CAT:1196: INFO: Terminating handlers in preparation for shutdown
132956.GVC3ZA03TESTING!WSL.432.5308.0: WSNAT_CAT:1197: INFO: Exiting system
132956.GVC3ZA03TESTING!JSL.2644.2356.0: JOLT_CAT:1506: "INFO: Terminating Jolt administration services in preparation for shutdown"
132956.GVC3ZA03TESTING!JSL.2644.2356.0: JOLT_CAT:1196: "INFO: Terminating handlers in preparation for shutdown"
132956.GVC3ZA03TESTING!JSH.4000.2464.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name 'jolt'; client name 'joltadmin'"
132956.GVC3ZA03TESTING!JSL.2644.2356.0: JOLT_CAT:1197: "INFO: Exiting system"
132956.GVC3ZA03TESTING!DMADM.5844.5348.0: CMDGW_CAT:1655: INFO: DMADMSVR is exiting
132959.GVC3ZA03TESTING!BBL.3216.4372.0: CMDTUX_CAT:26: INFO: The BBL is exiting system
133021.GVC3ZA03TESTING!tmloadcf.6104.3164.-2: 02-01-2007: Tuxedo Version 9.1, 32-bit
133021.GVC3ZA03TESTING!tmloadcf.6104.3164.-2: CMDTUX_CAT:872: INFO: TUXCONFIG file D:\bea\tuxedo9.1\samples\jolt\ToUpper\tuxconfig has been updated
133028.GVC3ZA03TESTING!BBL.6140.5124.0: 02-01-2007: Tuxedo Version 9.1, 32-bit, Patch Level (none)
133028.GVC3ZA03TESTING!BBL.6140.5124.0: LIBTUX_CAT:262: INFO: Standard main starting
133028.GVC3ZA03TESTING!DMADM.4928.1868.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
133028.GVC3ZA03TESTING!DMADM.4928.1868.0: LIBTUX_CAT:262: INFO: Standard main starting
133028.GVC3ZA03TESTING!DMADM.4928.1868.0: CMDGW_CAT:3149: INFO: BDMCONFIG environment variable not set. Using $APPDIR/BDMCONFIG
133028.GVC3ZA03TESTING!DMADM.4928.1868.0: CMDGW_CAT:3761: INFO: Using version 2 BDMCONFIG, 3DES is enabled.
133028.GVC3ZA03TESTING!JSL.5608.6088.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
133028.GVC3ZA03TESTING!JSL.5608.6088.0: LIBTUX_CAT:262: INFO: Standard main starting
133028.GVC3ZA03TESTING!JSL.5608.6088.0: INFO: JOLT Listener version-BEA Jolt 9.1
133028.GVC3ZA03TESTING!JSL.5608.6088.0: JOLT_CAT:1563: "INFO: Serial Number : <454493271161-2140437240256>, Expiration Date : <2007-02-15>"
133028.GVC3ZA03TESTING!JSL.5608.6088.0: JOLT_CAT:1564: "INFO: Licensee : <BEA Evaluation Customer>"
133029.GVC3ZA03TESTING!JSH.6028.5748.-2: 02-01-2007: Tuxedo Version 9.1, 32-bit
133029.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1030: "INFO: Jolt Handler joining application"
133029.GVC3ZA03TESTING!JSH.6028.5748.-2: INFO: JOLT Handler version-BEA Jolt 9.1
133029.GVC3ZA03TESTING!JREPSVR.3476.4980.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
133029.GVC3ZA03TESTING!JREPSVR.3476.4980.0: LIBTUX_CAT:262: INFO: Standard main starting
133029.GVC3ZA03TESTING!JREPSVR.3476.4980.0: Current version: BEA Jolt 9.1
133029.GVC3ZA03TESTING!JREPSVR.3476.4980.0: Repository "D:\bea\tuxedo9.1\udataobj\jolt\repository\jrepository" (16 records) is writable.
133029.GVC3ZA03TESTING!WSL.3292.4892.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
133029.GVC3ZA03TESTING!WSL.3292.4892.0: LIBTUX_CAT:262: INFO: Standard main starting
133029.GVC3ZA03TESTING!WSH.2568.3772.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
133029.GVC3ZA03TESTING!WSH.2568.3772.0: WSNAT_CAT:1030: INFO: Work Station Handler joining application
133029.GVC3ZA03TESTING!WSH.5764.3836.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
133029.GVC3ZA03TESTING!WSH.5764.3836.0: WSNAT_CAT:1030: INFO: Work Station Handler joining application
133242.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
133300.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name ''; client name 'myapp'"
133300.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
133359.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name ''; client name 'myapp'"
133456.GVC3ZA03TESTING!JSH.6028.5748.-2: Fldid32(ACCOUNT_ID) failed for INQUIRY: LIBFML_CAT:8: ERROR: Unknown field name. Maybe FIELDTBLS32 is not set properly.
133612.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
143325.GVC3ZA03TESTING!JSH.6028.5748.-2: Fldid(SAMOUNT) failed for DEPOSIT: LIBFML_CAT:11: ERROR: Cannot find or open field table. Maybe FIELDTBLS is not set properly.
144116.GVC3ZA03TESTING!WSL.3292.4892.0: WSNAT_CAT:1196: INFO: Terminating handlers in preparation for shutdown
144116.GVC3ZA03TESTING!WSL.3292.4892.0: WSNAT_CAT:1197: INFO: Exiting system
144116.GVC3ZA03TESTING!JSL.5608.6088.0: JOLT_CAT:1506: "INFO: Terminating Jolt administration services in preparation for shutdown"
144116.GVC3ZA03TESTING!JSL.5608.6088.0: JOLT_CAT:1196: "INFO: Terminating handlers in preparation for shutdown"
144116.GVC3ZA03TESTING!JSH.6028.5748.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name 'jolt'; client name 'joltadmin'"
144116.GVC3ZA03TESTING!JSL.5608.6088.0: JOLT_CAT:1197: "INFO: Exiting system"
144116.GVC3ZA03TESTING!DMADM.4928.1868.0: CMDGW_CAT:1655: INFO: DMADMSVR is exiting
144119.GVC3ZA03TESTING!BBL.6140.5124.0: CMDTUX_CAT:26: INFO: The BBL is exiting system
144142.GVC3ZA03TESTING!tmloadcf.2668.3316.-2: 02-01-2007: Tuxedo Version 9.1, 32-bit
144142.GVC3ZA03TESTING!tmloadcf.2668.3316.-2: CMDTUX_CAT:872: INFO: TUXCONFIG file D:\bea\tuxedo9.1\samples\jolt\ToUpper\tuxconfig has been updated
144148.GVC3ZA03TESTING!BBL.4144.4376.0: 02-01-2007: Tuxedo Version 9.1, 32-bit, Patch Level (none)
144148.GVC3ZA03TESTING!BBL.4144.4376.0: LIBTUX_CAT:262: INFO: Standard main starting
144148.GVC3ZA03TESTING!DMADM.4436.5968.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!DMADM.4436.5968.0: LIBTUX_CAT:262: INFO: Standard main starting
144148.GVC3ZA03TESTING!DMADM.4436.5968.0: CMDGW_CAT:3149: INFO: BDMCONFIG environment variable not set. Using $APPDIR/BDMCONFIG
144148.GVC3ZA03TESTING!DMADM.4436.5968.0: CMDGW_CAT:3761: INFO: Using version 2 BDMCONFIG, 3DES is enabled.
144148.GVC3ZA03TESTING!JSL.5072.2444.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!JSL.5072.2444.0: LIBTUX_CAT:262: INFO: Standard main starting
144148.GVC3ZA03TESTING!JSL.5072.2444.0: INFO: JOLT Listener version-BEA Jolt 9.1
144148.GVC3ZA03TESTING!JSL.5072.2444.0: JOLT_CAT:1563: "INFO: Serial Number : <454493271161-2140437240256>, Expiration Date : <2007-02-15>"
144148.GVC3ZA03TESTING!JSL.5072.2444.0: JOLT_CAT:1564: "INFO: Licensee : <BEA Evaluation Customer>"
144148.GVC3ZA03TESTING!JSH.5856.5268.-2: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!JSH.5856.5268.-2: JOLT_CAT:1030: "INFO: Jolt Handler joining application"
144148.GVC3ZA03TESTING!JSH.5856.5268.-2: INFO: JOLT Handler version-BEA Jolt 9.1
144148.GVC3ZA03TESTING!JREPSVR.2952.1248.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!JREPSVR.2952.1248.0: LIBTUX_CAT:262: INFO: Standard main starting
144148.GVC3ZA03TESTING!JREPSVR.2952.1248.0: Current version: BEA Jolt 9.1
144148.GVC3ZA03TESTING!JREPSVR.2952.1248.0: Repository "D:\bea\tuxedo9.1\udataobj\jolt\repository\jrepository" (16 records) is writable.
144148.GVC3ZA03TESTING!WSL.3040.5488.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!WSL.3040.5488.0: LIBTUX_CAT:262: INFO: Standard main starting
144148.GVC3ZA03TESTING!WSH.5740.2764.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!WSH.5740.2764.0: WSNAT_CAT:1030: INFO: Work Station Handler joining application
144148.GVC3ZA03TESTING!WSH.1784.5448.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144148.GVC3ZA03TESTING!WSH.1784.5448.0: WSNAT_CAT:1030: INFO: Work Station Handler joining application
144157.GVC3ZA03TESTING!JSH.5856.5268.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
144207.GVC3ZA03TESTING!JSH.5856.5268.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name ''; client name 'myapp'"
144226.GVC3ZA03TESTING!JSH.5856.5268.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
144229.GVC3ZA03TESTING!JSH.5856.5268.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
144518.GVC3ZA03TESTING!WSL.3040.5488.0: WSNAT_CAT:1196: INFO: Terminating handlers in preparation for shutdown
144518.GVC3ZA03TESTING!WSL.3040.5488.0: WSNAT_CAT:1197: INFO: Exiting system
144518.GVC3ZA03TESTING!JSL.5072.2444.0: JOLT_CAT:1506: "INFO: Terminating Jolt administration services in preparation for shutdown"
144518.GVC3ZA03TESTING!JSL.5072.2444.0: JOLT_CAT:1196: "INFO: Terminating handlers in preparation for shutdown"
144518.GVC3ZA03TESTING!JSH.5856.5268.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name 'jolt'; client name 'joltadmin'"
144518.GVC3ZA03TESTING!JSL.5072.2444.0: JOLT_CAT:1197: "INFO: Exiting system"
144519.GVC3ZA03TESTING!DMADM.4436.5968.0: CMDGW_CAT:1655: INFO: DMADMSVR is exiting
144522.GVC3ZA03TESTING!BBL.4144.4376.0: CMDTUX_CAT:26: INFO: The BBL is exiting system
144537.GVC3ZA03TESTING!tmloadcf.4892.4980.-2: 02-01-2007: Tuxedo Version 9.1, 32-bit
144537.GVC3ZA03TESTING!tmloadcf.4892.4980.-2: CMDTUX_CAT:872: INFO: TUXCONFIG file D:\bea\tuxedo9.1\samples\jolt\ToUpper\tuxconfig has been updated
144543.GVC3ZA03TESTING!BBL.5440.4548.0: 02-01-2007: Tuxedo Version 9.1, 32-bit, Patch Level (none)
144543.GVC3ZA03TESTING!BBL.5440.4548.0: LIBTUX_CAT:262: INFO: Standard main starting
144543.GVC3ZA03TESTING!DMADM.1016.6128.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!DMADM.1016.6128.0: LIBTUX_CAT:262: INFO: Standard main starting
144543.GVC3ZA03TESTING!DMADM.1016.6128.0: CMDGW_CAT:3149: INFO: BDMCONFIG environment variable not set. Using $APPDIR/BDMCONFIG
144543.GVC3ZA03TESTING!DMADM.1016.6128.0: CMDGW_CAT:3761: INFO: Using version 2 BDMCONFIG, 3DES is enabled.
144543.GVC3ZA03TESTING!JSL.1796.5232.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!JSL.1796.5232.0: LIBTUX_CAT:262: INFO: Standard main starting
144543.GVC3ZA03TESTING!JSL.1796.5232.0: INFO: JOLT Listener version-BEA Jolt 9.1
144543.GVC3ZA03TESTING!JSL.1796.5232.0: JOLT_CAT:1563: "INFO: Serial Number : <454493271161-2140437240256>, Expiration Date : <2007-02-15>"
144543.GVC3ZA03TESTING!JSL.1796.5232.0: JOLT_CAT:1564: "INFO: Licensee : <BEA Evaluation Customer>"
144543.GVC3ZA03TESTING!JSH.3164.4076.-2: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!JSH.3164.4076.-2: JOLT_CAT:1030: "INFO: Jolt Handler joining application"
144543.GVC3ZA03TESTING!JSH.3164.4076.-2: INFO: JOLT Handler version-BEA Jolt 9.1
144543.GVC3ZA03TESTING!JREPSVR.860.2916.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!JREPSVR.860.2916.0: LIBTUX_CAT:262: INFO: Standard main starting
144543.GVC3ZA03TESTING!JREPSVR.860.2916.0: Current version: BEA Jolt 9.1
144543.GVC3ZA03TESTING!JREPSVR.860.2916.0: Repository "D:\bea\tuxedo9.1\udataobj\jolt\repository\jrepository" (16 records) is writable.
144543.GVC3ZA03TESTING!WSL.2596.4404.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!WSL.2596.4404.0: LIBTUX_CAT:262: INFO: Standard main starting
144543.GVC3ZA03TESTING!WSH.3508.5136.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!WSH.3508.5136.0: WSNAT_CAT:1030: INFO: Work Station Handler joining application
144543.GVC3ZA03TESTING!WSH.4288.5676.0: 02-01-2007: Tuxedo Version 9.1, 32-bit
144543.GVC3ZA03TESTING!WSH.4288.5676.0: WSNAT_CAT:1030: INFO: Work Station Handler joining application
144548.GVC3ZA03TESTING!JSH.3164.4076.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"
144634.GVC3ZA03TESTING!JSH.3164.4076.-2: JOLT_CAT:1198: "WARN: Forced shutdown of client; user name ''; client name 'myapp'"
144734.GVC3ZA03TESTING!JSH.3164.4076.-2: JOLT_CAT:1043: "ERROR: tpacall() call failed, tperrno = 6"

Async tcp client and server. How can I determine that the client or the server is no longer available?

Hello. I would like to write async tcp client and server. I wrote this code but a have a problem, when I call the disconnect method on client or stop method on server. I can't identify that the client or the server is no longer connected.
I thought I will get an exception if the client or the server is not available but this is not happening.
private async void Process()
try
while (true)
var data = await this.Receive();
this.NewMessage.SafeInvoke(Encoding.ASCII.GetString(data));
catch (Exception exception)
How can I determine that the client or the server is no longer available?
Server
public class Server
private readonly Dictionary<IPEndPoint, TcpClient> clients = new Dictionary<IPEndPoint, TcpClient>();
private readonly List<CancellationTokenSource> cancellationTokens = new List<CancellationTokenSource>();
private TcpListener tcpListener;
private bool isStarted;
public event Action<string> NewMessage;
public async Task Start(int port)
this.tcpListener = TcpListener.Create(port);
this.tcpListener.Start();
this.isStarted = true;
while (this.isStarted)
var tcpClient = await this.tcpListener.AcceptTcpClientAsync();
var cts = new CancellationTokenSource();
this.cancellationTokens.Add(cts);
await Task.Factory.StartNew(() => this.Process(cts.Token, tcpClient), cts.Token, TaskCreationOptions.LongRunning, TaskScheduler.Default);
public void Stop()
this.isStarted = false;
foreach (var cancellationTokenSource in this.cancellationTokens)
cancellationTokenSource.Cancel();
foreach (var tcpClient in this.clients.Values)
tcpClient.GetStream().Close();
tcpClient.Close();
this.clients.Clear();
public async Task SendMessage(string message, IPEndPoint endPoint)
try
var tcpClient = this.clients[endPoint];
await this.Send(tcpClient.GetStream(), Encoding.ASCII.GetBytes(message));
catch (Exception exception)
private async Task Process(CancellationToken cancellationToken, TcpClient tcpClient)
try
var stream = tcpClient.GetStream();
this.clients.Add((IPEndPoint)tcpClient.Client.RemoteEndPoint, tcpClient);
while (!cancellationToken.IsCancellationRequested)
var data = await this.Receive(stream);
this.NewMessage.SafeInvoke(Encoding.ASCII.GetString(data));
catch (Exception exception)
private async Task Send(NetworkStream stream, byte[] buf)
await stream.WriteAsync(BitConverter.GetBytes(buf.Length), 0, 4);
await stream.WriteAsync(buf, 0, buf.Length);
private async Task<byte[]> Receive(NetworkStream stream)
var lengthBytes = new byte[4];
await stream.ReadAsync(lengthBytes, 0, 4);
var length = BitConverter.ToInt32(lengthBytes, 0);
var buf = new byte[length];
await stream.ReadAsync(buf, 0, buf.Length);
return buf;
Client
public class Client
private TcpClient tcpClient;
private NetworkStream stream;
public event Action<string> NewMessage;
public async void Connect(string host, int port)
try
this.tcpClient = new TcpClient();
await this.tcpClient.ConnectAsync(host, port);
this.stream = this.tcpClient.GetStream();
this.Process();
catch (Exception exception)
public void Disconnect()
try
this.stream.Close();
this.tcpClient.Close();
catch (Exception exception)
public async void SendMessage(string message)
try
await this.Send(Encoding.ASCII.GetBytes(message));
catch (Exception exception)
private async void Process()
try
while (true)
var data = await this.Receive();
this.NewMessage.SafeInvoke(Encoding.ASCII.GetString(data));
catch (Exception exception)
private async Task Send(byte[] buf)
await this.stream.WriteAsync(BitConverter.GetBytes(buf.Length), 0, 4);
await this.stream.WriteAsync(buf, 0, buf.Length);
private async Task<byte[]> Receive()
var lengthBytes = new byte[4];
await this.stream.ReadAsync(lengthBytes, 0, 4);
var length = BitConverter.ToInt32(lengthBytes, 0);
var buf = new byte[length];
await this.stream.ReadAsync(buf, 0, buf.Length);
return buf;

Hi,
Have you debug these two applications? Does it go into the catch exception block when you close the client or the server?
According to my test, it will throw an exception when the client or the server is closed, just log the exception message in the catch block and then you'll get it:
private async void Process()
try
while (true)
var data = await this.Receive();
this.NewMessage.Invoke(Encoding.ASCII.GetString(data));
catch (Exception exception)
Console.WriteLine(exception.Message);
Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
By the way, I don't know what the SafeInvoke method is, it may be an extension method, right? I used Invoke instead to test it.
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How to create client and server app using node.js in firefox os.

I want to create a client and server app using node.js for firefox os. Please suggest me how to create a apps.
I want to send a request from client to server and based on client request, service reply to client.
If any links available, Please share it.
Thanks

Hi sb00349044,
The SUMO forums focuses on end-user support.
For questions about developing for Firefox OS, you will find better guidance in MDN, StackOverflow, and mailing lists:
* [https://developer.mozilla.org/en-US/Firefox_OS MDN - Firefox OS]
* [http://stackoverflow.com/questions/tagged/firefox-os StackOverflow - Firefox OS]
* [https://lists.mozilla.org/listinfo Mailing Lists at Mozilla]
Thanks,
- Ralph

How to run a block from client avoiding timeout

Hi,
I have a block to run on my pc which will then communicate with the server and then complete the process and get the results. Now if my network connection dies in mean time, then the job gets terminated halfway. PLEASE let me know if anyone know how to run a job directly on the server or somekind of workaround to run it unexhaustively. just like we have NOHUP facility for UNIX scripts, do we have something for oracle.
Would be eager to get some solution.
Thanks and Regards.

You don't need the DBA role, no. You would need EXECUTE access on the DBMS_JOB or DBMS_SCHEDULER package, which you may well already have. Note that the DBMS_SCHEDULER package is only available in 10g-- you didn't specify what version of Oracle you're using, so I'm not sure if that's an option for you.
The simplest possible solution would be something like
DECLARE
l_jobno NUMBER;
BEGIN
dbms_job.submit( l_jobno, <<SQL script>>, sysdate + interval '1' minute );
commit;
END;which would run the <<SQL script>> in a background session starting in 1 minute.
Justin

How corba client and server find Naming service

hello
i want to ask how corba client and server find the Naming service ?
10x

By using a well-known port (I think the default for JavaIDL's NS is 1049) on a well-known address (localhost).
As these values are not really standard, you can specify them when starting the server and client (+-ORBInitialPort 1050 -ORBInitialHost localhost+). See the documentation .

JSSE Client and server communication problem .err:untrusted server cert

Hai all,
I am trying to communicate JSSE client and server.
I have created root.cert(CA),root.key,server.cert,server.key , client.cert and client.key. All these certificates are created using openssl.
I have placed root.cert in default keystore cacerts.
I have created a keystores(server & client) name mykeystore.
I have placed root.cert and client.cert in the client keystore.
I have placed root.cert and server.cert in the server keystore.
But during the run time i am getting javax.net.ssl.SSLException: untrusted server cert chain.
please suggest the modifications needs to be done to fix the error.
please tell me In the client keystore and in the server keystore....what certificates we need to put?
whether my approach as said above is correct or not?
In java code how to specify this particular certificate we are referring?
I have coded in this way ....
SSLContext ctx;
KeyManagerFactory kmf;
KeyStore ks;
char[] prasad = "prasad".toCharArray();
ctx = SSLContext.getInstance("SSLv3");
kmf = KeyManagerFactory.getInstance("SunX509");
ks = KeyStore.getInstance("jks");
ks.load(new FileInputStream("mykeystore"), prasad);
kmf.init(ks, prasad);
ctx.init(kmf.getKeyManagers(), null, null);
factory = ctx.getSocketFactory();
But my doubt is we are specifying only keystore name with that how it will check root.cert(ca) and client.cert and server.cert?
Is there any modifications need in my code?
Please tell me some way ...
Thanks ,
Prasad.

Hi prasad,
There will be a problem with the certificates being received from thr remote server or client. Check that your trust store contains the certificate of the remote machine or the CA that signed it and that the certificate has not expired.
Also be sure that both machines are using the latest version of the JSSE.
Hope this will help you.
Regards,
Anil.
Technical Support Engineer.

UDP Client and Server

I am trying to run a UDP Client and Server by running the server first and then the client. But when I try to do that I get the message java.lang.NoClassDefFoundError: UDPServer and java.lang.NoClassDefFoundError: UDPClient. I have included the code below. Can you please help. Thank you.
UDPClient.java:
import java.io.*;
import java.net.*;
import java.util.*;
public class UDPClient{
    public static void main(String[] args) throws IOException{
      Date d=new Date();
      long time1, time2, ETE, sumETE, maxETE, avgETE;
      if(args.length!=1){
          System.out.println("type java UDPClient <hostname>");
          return;
      time1=d.getTime();
      DatagramSocket s=new DatagramSocket();
      String st=new String("dldfjsdkjf");
      byte[] buf=new byte[256];
      buf=st.getBytes();
      InetAddress address=InetAddress.getByName(args[0]);
      DatagramPacket p = new DatagramPacket(buf, buf.length, address, 8777);
      s.send(p);
      p=new DatagramPacket(buf, buf.length, address, 8777);
      s.receive(p);
      time2=d.getTime();
      ETE=(time2-time1)/2;
      s.close();
UDPServer.java:
import java.io.*;
import java.net.*;
import java.util.*;
import java.lang.*;
public class UDPServer{
public static void main(String[] args){
    try{
      UDPServerThread ust = new UDPServerThread();
      ust.start();
    catch(IOException e){}
UDPServerThread.java:
import java.io.*;
import java.net.*;
import java.util.*;
import java.lang.*;
public class UDPServerThread extends Thread{
DatagramSocket s=null;
BufferedReader br=null;
PrintWriter pw=null;
public UDPServerThread() throws IOException{
    this("UDPServer");
public UDPServerThread(String name) throws IOException{
    super(name);
    s=new DatagramSocket(8777);
public void run(){
      char[] ca=new char[10];
    //while(true){
      try{
          byte[] buf = new byte[256];
          DatagramPacket p = new DatagramPacket(buf, buf.length);
          s.receive(p);
          String st=new String(p.getData());
          for(int i=0; i<10; i++){
              ca=st.charAt(i);
buf=st.getBytes();
InetAddress ad = p.getAddress();
int port = p.getPort();
p = new DatagramPacket(buf, buf.length, ad, port);
s.send(p);
catch(IOException e){
System.err.println("Failed to run the server");
System.exit(-1);
s.close();

this has nothing to do with your code, but how you are running it. It is a classpath problem.
You should go to the directory where the UDPClient.class is, and type
java -classpath . UDPClient
similarly for the UDPServer

Strange problem with SQLPLUS when client and server on the same box

Hi,
I have the problem with SQLPLUS when clinet and server on the same machine.
With client and server on the same machine i am running the command
sqlplus -l username/password@connect_identifier as SYSDBA.
With this command, even if you pass in wrong username or wrong password or both as wrong you can able to connect to database and execute queries.
Once Connect_identifier is correct and trying to log in as SYSDBA ,sqlplus will log in to DB with any username and password.
How to get rid of this behaviour. Is there any way to do this.
I am running this command by creating a process in C#
Edited by: user11000236 on Jun 16, 2009 10:31 AM

user11000236 wrote:
Thanks for the info.
How does Oracle/SQLPLUS allows any username or password to log in to DB with SYSDBA Privillages? What is the concept behind this.?
This is explainted in the above mentioned link:
Operating system authentication takes precedence over password file authentication. If you meet the requirements for operating system authentication, then even if you use a password file, you will be authenticated by operating system authentication.

Client and Server in one process

Hi all,
I am trying to create a process which can act as both Client and Server.
How can I do this?
Thanks!

AH. That's a better definition or explanation. Thanks.
This smells of a single process with multiple threads, each thread handling the basic needs of your requirements. In other words, have a thread deal with making one or more client type connections (use a main thread - the client controller - to spawn client-connection threads. This assumes you need multiplicity in your client-connection model.
Then make another thread - the server controller - to handle inbound connections, spawning a new thread for each inbound connection. Your main thread, the one that contains your main method, can watch everything that's going on and log or report what's going on in your client and server threads.
Going into specifics would be a lot to do here. Maybe someone is up for the challenge. Of course, this being a "New to Java Technology" forum, these concepts may be a bit beyond your skillset.
This is not the only way to go about solving your problem, but it's the only way I can think of at the moment given your requirements.
Hope this helps some.

Communication between client and server

I am using sockets for communication between the client and the server. is there any other way that i can use for communication between the client and server???

Plenty of ways: JMS, SOAP, RMI, a RESTful API, writing-files-to-a-shared-directory-on-the-disk, Sneakernet, ...
Some of them use sockets (or better TCP/IP) as the underlying protocol.
But to give you a good answer, you would have to tell us why you want a different way. I hope you're not searching for a different way just for the sake of being different.

How to run ear file in java application server

i want how to run .ear file in java application server
1. i m created ear file
2. i m created jar file (bean,home,remote)
3.i m created war file(in the form of jsp)
but till now i couldnt run ear file
how to run
please hel me

You must create :
1.Jar file
2.War file
And then put them into an ear file
Exemple : myapp.ear contains
myappEJB.jar
myappWEB.war
META-INF/application.xml
and application.xml looks like this :
<application xmlns="http://java.sun.com/xml/ns/j2ee" version="1.4"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com /xml/ns/j2ee
                        http://java.sun.com/xml/ns/j2ee/application_1_4.xsd">
    <display-name>myapp</display-name>
    <description>Demo application</description>
    <module>
        <ejb>myappEJB.jar</ejb>
    </module>
    <module>
      <web>
         <web-uri>myappWAR.war</web-uri>
         <context-root>/myapp</context-root>
      </web>
    </module>
</application>Good luck

How to run a datagram socket client and server program

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