Is my code right?(J2ME socket communication)

If i run this code in my emulator i get i get an IOException at at com.sun.cldc.io.j2me.socket.Protocol.openPrim(+7)
Can u please tell me where i've gone wrong.
Thanks
Here goes the code...
try
com.sun.cldc.io.j2me.socket.Protocol p = null;
String url = "socket://10.0.1.244:2500";
p = (com.sun.cldc.io.j2me.socket.Protocol)Connector.open(url,Connector.WRITE,true);
DataOutputStream dos = p.openDataOutputStream();
dos.writeUTF("this is my message");
dos.flush();
dos.close();
}catch(IOException e)
e.printStackTrace();
}

hi.
can anyone plz show how to send a PNG image file through a raw socket (from a j2se server to a midlet) ???
your code looks ok, nhikaripur.
thanks

Similar Messages

Problem with socket communications

I am trying to put together a client server socket communication pair.
I have one application that runs in the background acting as a server and another that can be started and stopped that acts as a client.
I can start the server and create a server socket with no problem.
I can start the client and it connects to the server.
The server acknowledges the connection and appears to go into a blocking state waiting for the client to send another message.
The server blocks at the line
parent.logit("Waiting for message from EVR..... ");
The problem is that when the client sends another message, the server doesn't hear it.
I am not sure if the problem is with the client or server communication code.
If anyone out there is a socket communication guru, I would appreciate it if you could tell me what I am doing wrong.
Thanks
Server code:
import java.io.*;
import java.net.*;
public class EVRServer
    extends Thread
EVRDataLoader parent = null;
ServerSocket serverSock = null;
Socket clientSock = null;
BufferedReader reader = null;
BufferedWriter writer = null;
int evrPort = 0;
int retryLimit = 10;
int retryCount = 0;
boolean alive = false;
boolean killSocket = false;
boolean evrConnected = false;
boolean retry = true;
EVRListener evrListener = null;
//=============================================================================
// Full constructor
//=============================================================================
   * Full constructor.
   * @param dl DataLoader - Parent application
   * @param port int Socket port
public EVRServer(EVRDataLoader dl, int port)
    parent = dl;
    evrPort = port;
//=============================================================================
// Run method - Main thread executed by start() method
//=============================================================================
   * Main thread executed by start() method
public void run()
    while (retry)
      if (retryCount > retryLimit)
        retry = false;
      parent.logit("Retry count = " + retryCount);
      // Create new server socket connection
      if (serverSock == null)
        try
          serverSock = new ServerSocket(evrPort);
          parent.logit("Created Server Socket for EVR on port " + evrPort);
          alive = true;
          killSocket = false;
          evrConnected = false;
        catch (Exception e)
          parent.logit(
              "ERROR - Could not create Server socket connection for EVR: " +
              e.toString());
          killSocket = true;
          alive = false;
      // Create new client socket connection
      if (clientSock == null)
        try
          parent.logit("Waiting for EVR to connect");
          clientSock = null;
          clientSock = serverSock.accept();
          retryCount = 0;
          evrConnected = true;
          killSocket = false;
          parent.logit("EVR connected on server Socket Port " + evrPort);
        catch (Exception e)
          parent.logit("ERROR - Error accepting EVR connection: " + e.toString());
          killSocket = true;
        try
          reader = new BufferedReader(new InputStreamReader(
              clientSock.getInputStream()));
          writer = new BufferedWriter(new OutputStreamWriter(
              clientSock.getOutputStream()));
          parent.logit( "Created reader "+reader);
          parent.logit( "Created writer "+writer);
        catch (Exception e)
          parent.logit(
              "ERROR - creating reader or writer to EVR: " + e.toString());
          killSocket = true;
      int nullCount = 0;
      while (killSocket == false)
        try
          parent.logit("Waiting for message from EVR..... ");
//          sendMessage("Data Controller connected on port " + evrPort);
          String s = reader.readLine();
          parent.logit("EVR - Received message: " + s);
          if (s != null)
            parent.processEvrMessage( s);
          else
            sleep(1000);
            nullCount++;
            if (nullCount > 10)
              parent.logit("Exceeded retry limit: ");
              killSocket = true;
        catch (Exception ex)
          parent.logit("Error Reading from EVR: " + ex.toString());
          killSocket = true;
      parent.logit( "After while loop");
      evrConnected = false;
      try
        retryCount++;
        parent.logit("Closing EVR connection. ");
        reader.close();
        writer.close();
        clientSock.close();
        writer = null;
        reader = null;
        clientSock = null;
        try
          sleep(1000);
        catch (Exception ee)
          parent.logit("Error after sleep " + ee.toString());
      catch (Exception e)
        parent.logit("Error closing EVR server socket");
//=============================================================================
// Call this method to kill the client socket connection.
//=============================================================================
   * Call this method to kill the client socket connection.
public void killConnection()
    killSocket = true;
//=============================================================================
// Return RTM connected state
//=============================================================================
   * Return RTM connected state
   * @return boolean - Returns true if RTM is connected to server, false if not.
public boolean isRtmConnected()
    return evrConnected;
//=============================================================================
// Returns state of server socket.
//=============================================================================
   * Returns state of server socket.
   * @return boolean - Returns true if server socket is enabled, false if not.
public boolean isServerSocketAlive()
    return alive;
//=============================================================================
// Send a message to the client socket.
//=============================================================================
     * Send a message to the client socket.
     * @param msg String - Message to send.
     * @return boolean - Returns true if message sent OK, false if not.
public boolean sendMessage(String msg)
    parent.logit(" In EVR Server - Send Message - got message: " + msg);
    if (evrConnected)
      try
        parent.logit("Sending message to EVR: " + msg);
        writer.write(msg + "\n");
        writer.flush();
        return true;
      catch (Exception e)
        parent.logit("ERROR - Error sending message to EVR: " + e.toString());
        return false;
    else
      parent.logit("EVR not connected, cannot send message: " + msg);
      return false;
}Client code:
package evrsimulator;
import java.net.*;
import java.io.*;
class PortConnector
      extends Thread
   ServerSocket serverSock = null;
   boolean isIP = false;
   InetAddress addr = null;
   Frame1 parent = null;
   byte[] rawIP;
    //   String initialMsg = "";
   public PortConnector( Frame1 f )
     parent = f;
   // This method is called when the thread runs
   public void run()
      if ( parent.hostName.indexOf( "." ) > 0 )
         isIP = true;
         byte[] rawIP = parent.getRawIP( parent.hostName );
      try
         System.out.println( "Connecting to host " +
                                        parent.hostName + " on port " +
                                        parent.socketPort );
         if ( isIP )
            addr = InetAddress.getByAddress( rawIP );
         else
            addr = InetAddress.getByName( parent.hostName );
         System.out.println( "Inet address = " + addr );
         SocketAddress sockaddr =
               new InetSocketAddress( addr, parent.socketPort );
         // Create an unbound socket
         parent.client = new Socket();
         // This method will block no more than timeoutMs.
         // If the timeout occurs, SocketTimeoutException is thrown.
         parent.client.connect( sockaddr, parent.socketTimeOut );
         parent.socketOut =
               new BufferedWriter( new OutputStreamWriter(
               parent.client.getOutputStream() ) );
         parent.socketIn = new BufferedReader( new InputStreamReader(
               parent.client.getInputStream() ) );
         parent.localName = parent.localName +
               parent.client;
         System.out.println( "Parent socketOut = "+parent.socketOut);
         System.out.println( "Parent socketIn = "+parent.socketIn);
      catch ( UnknownHostException uhe )
         System.out.println( "Unknown Host - " + uhe.getMessage() );
      catch ( SocketTimeoutException ste )
         System.out.println( "Socket time out - " + ste.getMessage());
      catch ( IOException ioe )
         System.out.println( "IO exception - " + ioe.getMessage() );
      // Listen on socket for message from host - thread should block.
      parent.portConnected = true;
      while ( parent.portConnected )
         try
            String msg = parent.socketIn.readLine();
            System.out.println( "Message from Host: " + msg );
            System.out.println( "Message from Host: |" + msg + "|" );
            if( msg.length() > 2)parent.processMessage( msg );
         catch ( IOException ioe )
            System.out.println( "Exception creating server socket." );
      try
         System.out.println(
               "PortConnection - Closing socket and IO connections" );
         parent.socketIn.close();
         parent.socketOut.close();
         parent.client.close();
         parent.clockRunning = false;
         if( parent.heartBeating) heartBeat.interrupt();
      catch ( IOException ioex )
         System.out.println( "Exception closing socket." );
}

Your first problem is that you keep closing and recreating the ServerSocket. Do this once only in the lifetime of the server.
This is such a basic error that I haven't read the rest of the code. Before you go any further I suggest you read the Custom Networking trail of the Java Tutorial.

Socket communication failure between Java applet and C++ application

I have a java applet that connects to a C++ application via Java's ServerSocket and Socket objects. THe C++ application is using the Winsock 2 API. The applet and application are running on an NT workstation (SP 6) and using IE (5.5) For a very simple C++ test applications the communictions work fine. Once more code gets added to the C++ application the portion of the socket that C++ listens to seems to close. Upon performing a recv call the return value is a zero. Microsoft insists this is a sign the Java side has shut down the socket. The Java applet can still receive messages from the C++ app but C++ cannot receive responses from the Java side. Java throws no exceptions and an explicit check of the socket shows no errors. Again, what puzzles me is that it works for simple C++ applications. Are there any known conflicts between Java and C++ in this regard?
I have inlcuded the basic java code segments below.
/ run Method.
* This method is called by the Thread.start() method. This
* method is required for the implementation of the Runnable interface
* This method sets up the server side socket communication and
* contiuously loops looking for requests from a external
* socket.
* @author Chris Duke
public void run(){
     // create socket connections
     boolean success = false;
     try {
         cServerSocket = new ServerSocket(cPortID);
         System.out.println("Waiting for client to connect...");
         cClientSocket = cServerSocket.accept();
         System.out.println("Client connected");
         // Create a stream to read from the client
         cInStream = new BufferedReader(new InputStreamReader(
           cClientSocket.getInputStream()));
         // Create a stream to write to the client
         cOutStream = new PrintWriter(
           cClientSocket.getOutputStream(), true);
         success = true;
     }catch (IOException e) {
         System.out.println("CommSocket:Run - Socket Exception(1) " + e);
         success = false;
     // if the socket was successfully created, keep the thread running
     while (success){
         try{
            // check socket to see if it is still available for reading
            if (cInStream != null && cInStream.ready()){
                // check for an incoming message
                String message = ReceiveMessage();
                // Send message to listeners
                Event(message);
            if (cInStream == null){
                success = false;
                System.out.println("CommSocket:Run - shutdown");
         }catch (IOException e){
            System.out.println("CommSocket:Run - Socket not ready exception");
            break;
// SendMessage method -
* Sends a text message to a connected listener through port specified by portID
* @author Chris Duke
* @param String message - This will be the message sent out through the server
* socket's port specified by portID.
   public void SendMessage(String message){
      cOutStream.println(message);
      if (cOutStream.checkError() == true)
        System.out.println("SendMessage : Flush = Error");
      else{
        System.out.println("SendMessage : Flush - No Error");
   }

a very simple C++ test applications the communictions work fine. Once more code gets added to the C++ application the portion of the socket that C++ listens to seems to close.
This quite strongly implicates the extra code in the C++ App. The firstly thing I would try would be telnet. Try connecting to both versions of the C++ Application and manually reproducing a proper exchange.
a recv call the return value is a zero. Microsoft insists this is a sign the Java side has shut down the socket.
A correct implementation of recv should return the number of bytes received, or -1 for an error. A zero return indicates no bytes received not a socket closed/error. This sounds like FUD to me.
Are there any known conflicts between Java and C++ in this regard?
I can see no obvious faults, though the code is incomplete, I don't think it's an sockets implementation issue, at either end, it sounds more likely to be a protocol/handshaking bug in the C++ App.

Socket communication very slow on Mac OS X 10.6

Hi everybody,
I'm using a socket based communication in an application and in Mac OS 10.5 everything works quick and flawless using XCode 3.1.4.
In Mac OS 10. 6, using XCode 3.2.4, I set the Mac OS X 10.6 SDK, I recompiled the app. but the responsiveness of the app is terrible slow. The GUI itself runs OK but any socket related action is painfully slow (sometimes connection timeout).
The socket communication is implemented using standard CFSocket classes.
Is this a XCode migration issue from 3.1 to 3.2 or a Mac OS 10.6 related one (I've seen lots of complains on networking issues)?
Thank you very much,
Dan

Thank you very much for the info but why it worked (and really fast) on 10.5. I also wonder why I didn't run into TCP_NODELAY problem there ? My TCP buffer size is 1K and I'm using the same testing environment.
Of course there is much more to it than some init parameters but still, what could be so different on 10.6 ? And I tried already the sysctl.conf TCP_NODELAY setting but no effect.
This is the code (briefly):
1. CONNECT
// Create signature from ip and port
struct sockaddr_in sin; /* TCP/UDP socket address structure. */
self->m_RemoteSocketSignature = (CFSocketSignature*)malloc(sizeof(CFSocketSignature));
self->m_RemoteSocketSignature->protocolFamily = PF_INET; /* IPv4 */
self->m_RemoteSocketSignature->socketType = SOCK_STREAM; /* Stream oriented. */
self->m_RemoteSocketSignature->protocol = IPPROTO_TCP; /* TCP */
memset( &sin, 0, sizeof( sin ) );
sin.sin_len= sizeof( sin );
sin.sin_family = AF_INET; /* Address is IPv4. Use PF_xxx for protocol
description, AF_xxx for address description. */
/* sin.port and sin.addr are in network( big endian ) byte order. */
sin.sin_port = CFSwapInt16HostToBig( port );
inet_aton( [address UTF8String], &sin.sin_addr ); /* inet_aton() gives back
network order addresses from strings. */
self->m_RemoteSocketSignature->address = CFDataCreate( NULL, (UInt8 *)&sin, sizeof( sin ) );
// Connect the Write & the Read streams to the socket
CFStreamCreatePairWithPeerSocketSignature (
kCFAllocatorDefault,
m_RemoteSocketSignature,
& m_ReadStream,
& m_WriteStream
if((m_ReadStream != NULL) && (m_WriteStream != NULL))
bOpenWrite = CFWriteStreamOpen (m_WriteStream);
bOpenRead = CFReadStreamOpen (m_ReadStream);
2. RECEIVE
CFIndex iTotalBytesRead = 0;
while (true == CFReadStreamHasBytesAvailable(m_ReadStream))
char buffer[1024];
CFIndex bufferLength = 1024;
CFIndex iBytesRead = CFReadStreamRead (
m_ReadStream,
buffer,
bufferLength
// Error ?
if(iBytesRead < 0)
return iBytesRead;
// EOS ?
if(iBytesRead == 0)
return iTotalBytesRead;
iTotalBytesRead += iBytesRead;
if(string != nil)
[string appendString:[NSString stringWithCString:buffer length:(unsigned)iBytesRead]];
3. SEND
CFIndex iBytesSent = CFWriteStreamWrite (
m_WriteStream,
buffer,
bufferLength
Thanks a lot for your help,
Dan

Socket communication via TCP-IP

Hi,
I am new to CF and would like to establish TCP-IP socket
communication with a remote server. How can I exchange XML messages
with a remote server / port via TCP-IP. Do I need to use the event
gateways of does CF offer another way of setting up socket
communication ?
Many thanks in advance !
John

Do I need to use the event gateways of does CF offer another way
of setting up socket communication ?
I would say, yes, use the socket gateway that ships with
Coldfusion. However, it has a functionality I cannot really
understand. If you are a client setting up a socket to connect to
the gateway, the gateway expects your code to have, beforehand, a
value for the variable
originatorID. Yet,
originatorID is a large, unique integer that the gateway
code generates when you connect. That seems to me to be a
chicken-and-egg dilemma.

Java WD and Socket Communication

Hi,
Is it possible to use Java Socket Communication with Java Web Dynpro. Or if not what is the best approach to have a Java Socket program integrated with a Web Dynpro Communication.
Basically, I have an application which provides API for communication via Java Sockets.And this needs to be integrated in our SAP application.
Thanks,
CD

Hi,
You are currently using JCO to "Connect to a Remote System" - JCO will connect to a back-end with the main purpose of "executing BAPI's" in it.
When you move to WebDynpro, you have what SAP calls Adaptive RFC Model - this will create a "Model Entity" in you WD Project that will do the same thing your JCO does.
Assume your JCO now calls "BAPI_GET_FLIGHTS", to return the Flights that are currently available - In your newly create WDP Project, you will manually specify what back-end you wanna use when "Importing" and you will tell also the BAPI name. WDP will generate the class structure that you need in order to execute that function.
JCO is what SAP created to execute BAPI's. JCO can be used by any "Java" like application that needs to connect to the back-end. But when you move to WDP, you don't need to use this anymore - You will use WDP Models.
Youi will still need your JCO Destinations created in the Application Server, so behind the scenes WDP creates a "layer" so you don't need to code the JCO calls manually.
Regards,
Daniel

Socket communication problem

hello all,
i have written a small program to send a message to echo server and get back the response from the server.
it gives a error as
COULD NOT GET I/O FOR CONNECTION TO <ip address>
i am working on win nt version 4 service pack 4 installed on a home computer.
the code is as below:
import java.io.*;
import java.net.*;
public class net4a {
public static void main(String[] args) throws IOException{
Socket echoSocket = null;
DataOutputStream os = null;
DataInputStream is = null;
 DataInputStream stdIn = new DataInputStream(System.in);
 InetAddress host = InetAddress.getLocalHost();
try {
echoSocket = new Socket(host, 7);
os = new DataOutputStream(echoSocket.getOutputStream());
is = new DataInputStream(echoSocket.getInputStream());
} catch (UnknownHostException e) {
System.err.println("Don't know about host: " + host);
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: " + host);
if (echoSocket != null && os != null && is != null) {
try {
String userInput;
while ((userInput = stdIn.readLine()) != null) {
os.writeBytes(userInput);
os.writeByte('\n');
System.out.println("echo: " + is.readLine());
os.close();
is.close();
echoSocket.close();
} catch (IOException e) {
System.err.println("I/O failed on the connection to: " + host);
look forward to ur valuable tips on the same.

Hello,
Long time java programmer, first time forum user.
Looks like you looking to looking to get a java applet/program communicating with a web server. This is not an extremely difficult task and I have successfully got apache communicating CGI transactions to and from an applet with no drama�s.
This is very useful as it is restrictive to have to open up extra sockets across a network as many networks today restrict socket communication often for security or business/organization policies.
An alternative is to use HTTP request using the POST command to talk to a web server with the web server replying to the request. For example, you may need to ask a database to pull out all customer names from a server-side database. The applet need only send a URLEncoded request to the server, the webserver invokes the CGI process (I use Java to handle the CGI requests but other methods/languages can be used) which returns the result of the transaction.
I have listed some code that included the a �ping-pong� request to a server. It included the applet function that calls the webserver, the CGI batch script (for win NT/XP) to invoke the java program, the cgi-lib to simply parse the URL request (many thanks to the author) and the server-side java program that responds to the request.
I hope you find this useful. The download for apache, the webserver, is available at
http://www.apache.org/
and is a pretty simple install. Make sure you fix up the httpd.conf file to suit your system.
Good luck.
Dale Miller
CLIENT-SIDE (Java Applet Snippit)
public class Comm {
 private String server;
 private URL toServer;
 private URLConnection uRLConnection;
 private DataOutputStream dataOutputStream;
 private StringBuffer output;
 private BufferedReader dataInputStream;
 private String result;
 private int resultsLast;
 private String results[] = new String[100];
 private int firstTU;
 //this function starts in its own thread and takes care
 //of logins and there re-tries, the messaging.
 //Please see the actual function for better details
 //private LoginWatcher loginWatcher;
 public Comm(String serverAddress) throws UnsupportedEncodingException{
 System.out.println("loaded Comm class!");
 //First thing we need to do is set up the login watcher
 //loginWatcher = new LoginWatcher();
 this.output = new StringBuffer();
 this.server = serverAddress;
 try {
 this.toServer = new URL(server + "ping.cgi");
 } catch (MalformedURLException e) {
 System.out.println("ERROR : in contacting the server");
 System.out.println("Server : " + server);
 System.out.println("NOT FOUND!!");
 try {
 this.uRLConnection = toServer.openConnection();
 } catch (IOException e) {
 System.out.println("ERROR : Connection to server refused");
 this.uRLConnection.setUseCaches(false);
 this.uRLConnection.setDoInput(true);
 this.uRLConnection.setDoOutput(true);
 this.uRLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
 try {
 this.dataOutputStream = new DataOutputStream(uRLConnection.getOutputStream());
 } catch (IOException e) {
 System.out.println("ERROR : opening dataoutputstream");
 this.output.setLength(0);
 output.append("first=" + URLEncoder.encode("I am", "UTF-8"));
 output.append("&last=" + URLEncoder.encode("number 1", "UTF-8"));
 try {
 dataOutputStream.writeBytes(new String(output));
 } catch (IOException e) {
 System.out.println("ERROR : Sending string to cgi ping.cgi");
 try {
 this.dataInputStream = new BufferedReader(new InputStreamReader(uRLConnection.getInputStream()));
 } catch (IOException e) {
 System.out.println("ERROR : Setting up input stream");
 String grab = new String();
 System.out.print("Searching for server..");
 try {
 grab = dataInputStream.readLine();
 grab = dataInputStream.readLine();
 } catch (IOException e) {
 System.out.println("ERROR : Reciving ping data from server");
 if (grab.equals("pass")) {
 System.out.println("OK");
 } else {
 System.out.println("ERROR\n\nSERVER NOT FOUND!!!");
 System.exit(-1);
 //loginWatcher.loginWatcherTh.start();
CGI BATCH TO INVOKE CGI PROGRAM
#!java -cp c:\ss\ middle
CGI-LIB TO PARSE HTTP REQUESTS
import java.util.*;
import java.io.*;
* cgi_lib.java
* 
* Usage: This library of java functions, which I have encapsulated inside
* a class called cgi_lib as class (static) member functions,
* attempts to duplicate the standard PERL CGI library (cgi-lib.pl).
* You must invoke any Java program that uses this library from
* within a UNIX script, Windows batch file or equivalent. As you
* will see in the following example, all of the CGI environment
* variables must be passed from the script into the Java application
* using the -D option of the Java interpreter. This example
* UNIX script uses the "main" routine of this class as a
* CGI script:
* <pre>
* (testcgi.sh)
* #!/bin/sh
* java \
* -Dcgi.content_type=$CONTENT_TYPE \
* -Dcgi.content_length=$CONTENT_LENGTH \
* -Dcgi.request_method=$REQUEST_METHOD \
* -Dcgi.query_string=$QUERY_STRING \
* -Dcgi.server_name=$SERVER_NAME \
* -Dcgi.server_port=$SERVER_PORT \
* -Dcgi.script_name=$SCRIPT_NAME \
* -Dcgi.path_info=$PATH_INFO \
* cgi_lib
* </pre>
* Question and comments can be sent to [email protected].
* @version 1.0
* @author Pat L. Durante
class cgi_lib
* Parse the form data passed from the browser into
* a Hashtable. The names of the input fields on the HTML form will
* be used as the keys to the Hashtable returned. If you have a form
* that contains an input field such as this,
* <pre>
* &ltINPUT SIZE=40 TYPE="text" NAME="email" VALUE="[email protected]"&gt
* </pre>
* then after calling this method like this,
* <pre>
* Hashtable form_data = cgi_lib.ReadParse(System.in);
* </pre>
* you can access that email field as follows:
* <pre>
* String email_addr = (String)form_data.get("email");
* </pre>
* @param inStream The input stream from which the form data can be read.
* (Only used if the form data was posted using the POST method. Usually,
* you will want to simply pass in System.in for this parameter.)
* @return The form data is parsed and returned in a Hashtable
* in which the keys represent the names of the input fields.
public static Hashtable ReadParse(InputStream inStream)
Hashtable form_data = new Hashtable();
String inBuffer = "";
if (MethGet())
inBuffer = System.getProperty("cgi.query_string");
else
// TODO: I should probably use the cgi.content_length property when
// reading the input stream and read only that number of
// bytes. The code below does not use the content length
// passed in through the CGI API.
DataInput d = new DataInputStream(inStream);
String line;
try
while((line = d.readLine()) != null)
inBuffer = inBuffer + line;
catch (IOException ignored) { }
// Split the name value pairs at the ampersand (&)
StringTokenizer pair_tokenizer = new StringTokenizer(inBuffer,"&");
while (pair_tokenizer.hasMoreTokens())
String pair = urlDecode(pair_tokenizer.nextToken());
// Split into key and value
StringTokenizer keyval_tokenizer = new StringTokenizer(pair,"=");
String key = new String();
String value = new String();
if (keyval_tokenizer.hasMoreTokens())
key = keyval_tokenizer.nextToken();
else ; // ERROR - shouldn't ever occur
if (keyval_tokenizer.hasMoreTokens())
value = keyval_tokenizer.nextToken();
else ; // ERROR - shouldn't ever occur
// Add key and associated value into the form_data Hashtable
form_data.put(key,value);
return form_data;
* URL decode a string.
* Data passed through the CGI API is URL encoded by the browser.
* All spaces are turned into plus characters (+) and all "special"
* characters are hex escaped into a %dd format (where dd is the hex
* ASCII value that represents the original character). You probably
* won't ever need to call this routine directly; it is used by the
* ReadParse method to decode the form data.
* @param in The string you wish to decode.
* @return The decoded string.
public static String urlDecode(String in)
StringBuffer out = new StringBuffer(in.length());
int i = 0;
int j = 0;
while (i < in.length())
char ch = in.charAt(i);
i++;
if (ch == '+') ch = ' ';
else if (ch == '%')
ch = (char)Integer.parseInt(in.substring(i,i+2), 16);
i+=2;
out.append(ch);
j++;
return new String(out);
* Generate a standard HTTP HTML header.
* @return A String containing the standard HTTP HTML header.
public static String Header()
return "Content-type: text/html\n\n";
* Generate some vanilla HTML that you usually
* want to include at the top of any HTML page you generate.
* @param Title The title you want to put on the page.
* @return A String containing the top portion of an HTML file.
public static String HtmlTop(String Title)
String Top = new String();
Top = "<html>\n";
Top+= "<head>\n";
Top+= "<title>\n";
Top+= Title;
Top+= "\n";
Top+= "</title>\n";
Top+= "</head>\n";
Top+= "<body>\n";
return Top;
* Generate some vanilla HTML that you usually
* want to include at the bottom of any HTML page you generate.
* @return A String containing the bottom portion of an HTML file.
public static String HtmlBot()
return "</body>\n</html>\n";
* Determine if the REQUEST_METHOD used to
* send the data from the browser was the GET method.
* @return true, if the REQUEST_METHOD was GET. false, otherwise.
public static boolean MethGet()
String RequestMethod = System.getProperty("cgi.request_method");
boolean returnVal = false;
if (RequestMethod != null)
if (RequestMethod.equals("GET") ||
RequestMethod.equals("get"))
returnVal=true;
return returnVal;
* Determine if the REQUEST_METHOD used to
* send the data from the browser was the POST method.
* @return true, if the REQUEST_METHOD was POST. false, otherwise.
public static boolean MethPost()
String RequestMethod = System.getProperty("cgi.request_method");
boolean returnVal = false;
if (RequestMethod != null)
if (RequestMethod.equals("POST") ||
RequestMethod.equals("post"))
returnVal=true;
return returnVal;
* Determine the Base URL of this script.
* (Does not include the QUERY_STRING (if any) or PATH_INFO (if any).
* @return The Base URL of this script as a String.
public static String MyBaseURL()
String returnString = new String();
returnString = "http://" +
System.getProperty("cgi.server_name");
if (!(System.getProperty("cgi.server_port").equals("80")))
returnString += ":" + System.getProperty("cgi.server_port");
returnString += System.getProperty("cgi.script_name");
return returnString;
* Determine the Full URL of this script.
* (Includes the QUERY_STRING (if any) or PATH_INFO (if any).
* @return The Full URL of this script as a String.
public static String MyFullURL()
String returnString;
returnString = MyBaseURL();
returnString += System.getProperty("cgi.path_info");
String queryString = System.getProperty("cgi.query_string");
if (queryString.length() > 0)
returnString += "?" + queryString;
return returnString;
* Neatly format all of the CGI environment variables
* and the associated values using HTML.
* @return A String containing an HTML representation of the CGI environment
* variables and the associated values.
public static String Environment()
String returnString;
returnString = "<dl compact>\n";
returnString += "<dt>CONTENT_TYPE <dd>:" +
System.getProperty("cgi.content_type") +
": \n";
returnString += "<dt>CONTENT_LENGTH <dd>:" +
System.getProperty("cgi.content_length") +
": \n";
returnString += "<dt>REQUEST_METHOD <dd>:" +
System.getProperty("cgi.request_method") +
": \n";
returnString += "<dt>QUERY_STRING <dd>:" +
System.getProperty("cgi.query_string") +
": \n";
returnString += "<dt>SERVER_NAME <dd>:" +
System.getProperty("cgi.server_name") +
": \n";
returnString += "<dt>SERVER_PORT <dd>:" +
System.getProperty("cgi.server_port") +
": \n";
returnString += "<dt>SCRIPT_NAME <dd>:" +
System.getProperty("cgi.script_name") +
": \n";
returnString += "<dt>PATH_INFO <dd>:" +
System.getProperty("cgi.path_info") +
": \n";
returnString += "</dl>\n";
return returnString;
* Neatly format all of the form data using HTML.
* @param form_data The Hashtable containing the form data which was
* parsed using the ReadParse method.
* @return A String containing an HTML representation of all of the
* form variables and the associated values.
public static String Variables(Hashtable form_data)
String returnString;
returnString = "<dl compact>\n";
for (Enumeration e = form_data.keys() ; e.hasMoreElements() ;)
String key = (String)e.nextElement();
String value = (String)form_data.get(key);
returnString += "<dt>" + key + " <dd>:" +
value +
": \n";
returnString += "</dl>\n";
return returnString;
* The main routine is included here as a test CGI script to
* demonstrate the use of all of the methods provided above.
* You can use it to test your ability to execute a CGI script written
* in Java. See the sample UNIX script file included above to see
* how you would invoke this routine.
* Please note that this routine references the member functions directly
* (since they are in the same class), but you would have to
* reference the member functions using the class name prefix to
* use them in your own CGI application:
* <pre>
* System.out.println(cgi_lib.HtmlTop());
* </pre>
* @param args An array of Strings containing any command line
* parameters supplied when this program in invoked. Any
* command line parameters supplied are ignored by this routine.
public static void main( String args[] )
// This main program is simply used to test the functions in the
// cgi_lib class.
// That said, you can use this main program as a test cgi script. All
// it does is echo back the form inputs and enviroment information to
// the browser. Use the testcgi UNIX script file to invoke it. You'll
// notice that the script you use to invoke any Java application that
// uses the cgi_lib functions MUST pass all the CGI enviroment variables
// into it using the -D parameter. See testcgi for more details.
// Print the required CGI header.
System.out.println(Header());
// Create the Top of the returned HTML
// page (the parameter becomes the title).
System.out.println(HtmlTop("Hello World"));
System.out.println("<hr>");
// Determine the request method used by the browser.
if (MethGet())
System.out.println("REQUEST_METHOD=GET");
if (MethPost())
System.out.println("REQUEST_METHOD=POST");
System.out.println("<hr>");
// Determine the Base URL of this script.
System.out.println("Base URL: " + MyBaseURL());
System.out.println("<hr>");
// Determine the Full URL used to invoke this script.
System.out.println("Full URL: " + MyFullURL());
System.out.println("<hr>");
// Print all the CGI environment variables
// (usually only used while testing CGI scripts).
System.out.println(Environment());
System.out.println("<hr>");
// Parse the form data into a Hashtable.
Hashtable form_data = ReadParse(System.in);
// Print out each of the name/value pairs
// from sent from the browser.
System.out.println(Variables(form_data));
System.out.println("<hr>");
// Access a particular form value.
// (This assumes the form contains a "name" input field.)
String name = (String)form_data.get("name");
System.out.println("Name=" + name);
System.out.println("<hr>");
// Create the Bottom of the returned HTML page - which closes it cleanly.
System.out.println(HtmlBot());
SERVER-SIDE PROGRAM TO RETURN PING
import java.util.*;
import java.io.*;
class ping
 public static void main(String args[]) {
 System.out.println(cgi_lib.Header());
 Hashtable form_data = cgi_lib.ReadParse(System.in);
 String one = (String)form_data.get("first");
 String two = (String)form_data.get("last");
 boolean test;
 test = false;
 if (one.equals("I am")) {
 if (two.equals("number 1")) {
 test = true;
 if (test == true) {
 System.out.println("pass");
 } else {
 System.out.println("fail");
 //Datavasee
ENJOY :)

Request giving Socket communication error at call=recv: error.

Hi All,
My requirement goes like this for OBIEE 11G :
I have two requests(analysis) and I want to show either of them at a given time based on a Dashboard prompt. I have set a Presentation variable {PV} for this Prompt whcih always hays two values A and B.
My first request is like this :
Dim 1 Measure 1 ( this should be shown when I select Dashboard Prompt A.
My second request is:
Dim 2 Measure 2 ( this should be shown when I select Dashboard Prompt B.
I have to use the Guided Navigation ( Sectional Condition in 11g)
When Dashboard Prompt A is selected Section 1 i.e. Request 1 should be shown when Dashboard Prompt B is selected then it should show request 2.
To achieve this in request 1 I have added a extra filter '@{PV}' is equal to/is in 'A' and in request 2 I have added a extra filter '@{PV}' is equal to/is in 'B' so as when we select B in Prompt the first request should 'No Results' so as I can achieve my Guided Navigation.
But to my surprise when I select B in the Dashboard Prompt the first request throws an error.
Error Details
Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 12002] Socket communication error at call=recv: (Number=10038) An operation was attempted on something that is not a socket. (HY000)
Please help me out with this regards as I was able to achieve this functionality easily in 10G OBIEE.
Regards,
Bhavik

Hi,
Mistakenly my machine got restarted and after that when I tried to start OPMN services,its showing all the processes alive but after that ,while restarting BI services from windows
its throwing an error of unexpectedly shutting down of services.
My NQS log says:
[nQSError: 12010] Communication error connecting to remote end point: address = 192.168.10.209; port = 80.
[nQSError: 46119] Failed to open HTTP connection to server 192.168.10.209 at port 80.
I have checked that IP is still same. What is the issue behind it?
This is very urgent.I have already posted this issues many times but didn't get any response So please help.

[nQSError: 12002] Socket communication error at call=recv: (Number=10004)

Can any1 plz help...!
I am unable to start presentation services...! I am currently using windows server 2003 service pack 2. I tried configuring scheduler after which I got the message:
"Windows could'nt start Oracle BI Presentation server on local computer. For more information review the system event log. If this is a non-microsft service, contact the service vendor, and refer to service-specific error code -1."
I am getting these 2 errors:
In nqserver.log shows below error
[nQSError: 12002] Socket communication error at call=recv: (Number=10004) A blocking operation was interrupted by a call to WSACancelBlockingCall.
In nqscheduler.log shows below error
[nQSError: 12002] Socket communication error at call=: (Number=10048) Only one usage of each socket address (protocol/network address/port) is normally permitted.
I have changed scheduler port (in Job manager-->file-->configure options..>schedule-->general tab) to an available open port since 9705 is not available. I also updated port number in instanceconfig.xml file.
Any suggestions would be really appreciated.

have you seen the blog of John about this? http://obiee101.blogspot.com/2008/08/obiee-configuring-configuring-scheduler.html
hope this heps

[nQSError: 12002] Socket communication error at call=(Number=10004, 10048)

Can any1 plz help...!
I am unable to start presentation services...! I am currently using windows server 2003 service pack 2. I tried configuring scheduler after which I got the message:
"Windows could'nt start Oracle BI Presentation server on local computer. For more information review the system event log. If this is a non-microsft service, contact the service vendor, and refer to service-specific error code -1."
I am getting these 2 errors:
In nqserver.log shows below error+
[nQSError: 12002] Socket communication error at call=recv: (Number=10004) A blocking operation was interrupted by a call to WSACancelBlockingCall.
In nqscheduler.log shows below error_
[nQSError: 12002] Socket communication error at call=: (Number=10048) Only one usage of each socket address (protocol/network address/port) is normally permitted.
I have changed scheduler port (in Job manager-->file-->configure options..>schedule-->general tab) to an available open port since 9705 is not available. I also updated port number in instanceconfig.xml file.
Any suggestions would be really appreciated.

user12970693 wrote:
Can any1 plz help...!Gawsh. That's awful.
I wonder whether people who deal primarily with BI Server might be able to help you better than people who deal primarily with the database?
http://forums.oracle.com/forums/category.jspa?categoryID=145
I am unable to start presentation services...! I am currently using windows server 2003 service pack 2. I tried configuring scheduler after which I got the message:
"Windows could'nt start Oracle BI Presentation server on local computer. For more information review the system event log. If this is a non-microsft service, contact the service vendor, and refer to service-specific error code -1."
I am getting these 2 errors:
In nqserver.log shows below error+
[nQSError: 12002] Socket communication error at call=recv: (Number=10004) A blocking operation was interrupted by a call to WSACancelBlockingCall.
In nqscheduler.log shows below error_
[nQSError: 12002] Socket communication error at call=: (Number=10048) Only one usage of each socket address (protocol/network address/port) is normally permitted.
I have changed scheduler port (in Job manager-->file-->configure options..>schedule-->general tab) to an available open port since 9705 is not available. I also updated port number in instanceconfig.xml file.
Any suggestions would be really appreciated.On first guess, I'd almost think some anti-virus or firewall is haunting that machine.

[nQSError: 12002] Socket communication error at call=recv: (Number=10038)

Hi, When I try to run any reports in Oracle Answers I am getting the following error:
Odbc driver returned an error (SQLExecDirectW).
State: HY000. Code: 10058. NQODBC SQL_STATE: HY000 nQSError: 10058 A general error has occurred.
nQSError: 12002 Socket communication error at call=recv: (Number=10038) An operation was attempted on something that is not a socket. (HY000)
When I try to issue a 'Direct Database Request' from Answers, it is working fine and I can see the results. The error is occuring only when I select any columns from the Presentation Catalog and try to run the Adhoc report.
Please could you help me fix this issue.
Thanks
Srikanth

Hi, When I try to run any reports in Oracle Answers I am getting the following error:
Odbc driver returned an error (SQLExecDirectW).
State: HY000. Code: 10058. NQODBC SQL_STATE: HY000 nQSError: 10058 A general error has occurred.
nQSError: 12002 Socket communication error at call=recv: (Number=10038) An operation was attempted on something that is not a socket. (HY000)
When I try to issue a 'Direct Database Request' from Answers, it is working fine and I can see the results. The error is occuring only when I select any columns from the Presentation Catalog and try to run the Adhoc report.
Please could you help me fix this issue.
Thanks
Srikanth

BI Server Socket communication error

All,
OBIEE 10G with Oracle 11 database on Sun solaris.
BI Server is randomly crashing with following error message:
Odbc driver returned an error (SQLDriverConnectW).
State: HY000. Code: 0. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 12008]
Unable to connect to port 9703 on machine LOCALHOST. [nQSError: 12010]
Communication error connecting to remote end point: address = LOCALHOST; port = 9703. [nQSError: 12002]
Socket communication error at call=: (Number=-1) Unknown error (HY000)
If you restart, it works fine for 1-2 days. Then again crash happens.
Any ideas ..?
~R

I've had similar issues due to insufficient memory on HP-UX. Probably best to raise a support log with oracle.

How to manage socket communications

i need to learn about how to manage socket communications. does any one has sample codes to share that illustrates how to manage sockets? Im going to create an application that listens over a socket. My socket listener should be able to read over the socket continuously without user intervention. If there's no data, it would wait until something comes in. If some data come in, the listener should be able to read it automatically, and save data in db.
Im thinking of an infinite loop here, but the problem
arises when the socket is waiting for data to come in. The application consumes 100% CPU resources. And im only running one instance of my socket listener. My solution here is to use threads and let the thread SLEEP for a while when no there's no data yet.
Any advise on this matter is very much appreciated. Thank you.

It sounds, that you are using non-blocking read from a socket inside a busy wait loop. You should do a blocking read, which means your process/thread will be suspended by OS untill something is available on your socket.
I'm new to Java and I can not say how actually to implement this, but look for "blocking/non-blocking read" in network interface documentation.
Zhenya.

Use of synchronized queue for java socket communications

Hi all,
We have a need for a server socket application (stand alone java application) to process just one command per time coming from a java socket client (JSP Web application). There are a lot of users accessing the java socket client, but the server socket can only handle one command per time, so there is a need of a queue type, so users will have to wait for their time.
We've been told that we can use "synchronized Queue", but we don't know what it is and how to use. A URL, book etc. with sample code would assist us, since we are new to both java socket communication and queue of commands.
Can anyone assist us
cheers
Trajano
P.S.
The server socket java application has two threads:
1st thread handles the java socket communication;
2nd thread is a RS-232 serial driver that communicates to several micro-controllers connected on a multi-drop.
JSP web app client socket users can issue various commands at the same time to the java server socket app, however the server can only service one command per time (just one RS-232 COM1 serial port available). The commands have to somehow be added to a queue for processing.

I do not have the experience to offer advice. But I just happened to be reading today about Collections.synchronizedList.
import java.util.List;
import java.util.LinkedList;
import java.util.Collections;
public class Queue {
   private List queue;
   public Queue() {
      queue = Collections.synchronizedList(new LinkedList());
   public Object removeItem() throws InterruptedException {
      synchronized (queue) {
         while (queue.isEmpty())
            queue.wait();
         return queue.remove(0);
   public void addItem(Object item) {
      synchronized (queue) {
         queue.add(item);
         queue.notifyAll();
class Test {
   public static void main(String[] args) {
      final Queue queue = new Queue();
      //start a thread to process items from the queue
      Runnable work = new Runnable() {
         public void run() {
            try {
               Object item = queue.removeItem();
               //do something with item
            } catch (InterruptedException e) {
               //handle this
      Thread worker = new Thread(work);
      worker.start();
}Reference: Java Thread Programming, Paule Hyde
Also, here is Doug Lea's library,
http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html

J2ME socket programming

i am doing a final year project in which i have a java program running on pc connected to internet which uses bsnl as an isp.i am provided with a public ip
i have a J2me client.I connect the mobile to internet with gprs.
I use gprs wap settings of vodafone which uses proxies.i have searched internet
and found out that i dont access actual internet using gprs wap. ie we only access wap sites.i want to try purely socket communications.i am using n72 mobile for midlets and socket communications.
sc = (SocketConnection)Connector.open("socket://my bsnl ip:5000");
is = sc.openInputStream();
os = sc.openOutputStream();
i have used simulator and tried communication it was successful.
i tried socket communications form internet client and my server
i also tried different ports too.
now with actual n72 mobile i am having a problem of socket communication.
summary of problems
1.Is direct socket communication possible through gprs with client on N72
with a java server
2.Do i have to use wap settings or internet settings of vodafone

here is my client on mobile..it is same as networkdemo in suns WTK2.5
we used it for testing the connection...
SocketMIdlet:
package socket;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class SocketMIDlet extends MIDlet implements CommandListener {
private static final String SERVER = "Server";
private static final String CLIENT = "Client";
private static final String[] names = { SERVER, CLIENT };
private static Display display;
private Form f;
private ChoiceGroup cg;
private boolean isPaused;
private Server server;
private Client client;
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
private Command startCommand = new Command("Start", Command.ITEM, 1);
public SocketMIDlet() {
display = Display.getDisplay(this);
f = new Form("Socket Demo");
cg = new ChoiceGroup("Please select peer", Choice.EXCLUSIVE, names, null);
f.append(cg);
f.addCommand(exitCommand);
f.addCommand(startCommand);
f.setCommandListener(this);
display.setCurrent(f);
public boolean isPaused() {
return isPaused;
public void startApp() {
isPaused = false;
public void pauseApp() {
isPaused = true;
public void destroyApp(boolean unconditional) {
if (server != null) {
server.stop();
if (client != null) {
client.stop();
public void commandAction(Command c, Displayable s) {
if (c == exitCommand) {
destroyApp(true);
notifyDestroyed();
} else if (c == startCommand) {
String name = cg.getString(cg.getSelectedIndex());
if (name.equals(SERVER)) {
server = new Server(this);
server.start();
} else {
client = new Client(this);
client.start();
Client:
package socket;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class Client implements Runnable, CommandListener {
private SocketMIDlet parent;
private Display display;
private Form f;
private StringItem si;
private TextField tf;
private boolean stop;
private Command sendCommand = new Command("Send", Command.ITEM, 1);
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
InputStream is;
OutputStream os;
SocketConnection sc;
Sender sender;
public Client(SocketMIDlet m) {
parent = m;
display = Display.getDisplay(parent);
f = new Form("Socket Client");
si = new StringItem("Status:", " ");
tf = new TextField("Send:", "", 30, TextField.ANY);
f.append(si);
f.append(tf);
f.addCommand(exitCommand);
f.addCommand(sendCommand);
f.setCommandListener(this);
display.setCurrent(f);
* Start the client thread
public void start() {
Thread t = new Thread(this);
t.start();
public void run() {
try {
sc = (SocketConnection)Connector.open("socket://59.95.23.211:4000");
si.setText("Connected to server");
is = sc.openInputStream();
os = sc.openOutputStream();
// Start the thread for sending messages - see Sender's main
// comment for explanation
sender = new Sender(os);
// Loop forever, receiving data
while (true) {
StringBuffer sb = new StringBuffer();
int c = 0;
while (((c = is.read()) != '\n') && (c != -1)) {
sb.append((char)c);
if (c == -1) {
break;
// Display message to user
si.setText("Message received - " + sb.toString());
stop();
si.setText("Connection closed");
f.removeCommand(sendCommand);
} catch (ConnectionNotFoundException cnfe) {
Alert a = new Alert("Client", "Please run Server MIDlet first", null, AlertType.ERROR);
a.setTimeout(Alert.FOREVER);
a.setCommandListener(this);
display.setCurrent(a);
} catch (IOException ioe) {
if (!stop) {
ioe.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
public void commandAction(Command c, Displayable s) {
if ((c == sendCommand) && !parent.isPaused()) {
sender.send(tf.getString());
if ((c == Alert.DISMISS_COMMAND) || (c == exitCommand)) {
parent.notifyDestroyed();
parent.destroyApp(true);
* Close all open streams
public void stop() {
try {
stop = true;
if (sender != null) {
sender.stop();
if (is != null) {
is.close();
if (os != null) {
os.close();
if (sc != null) {
sc.close();
} catch (IOException ioe) {
Sender:
package socket;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class Sender extends Thread {
private OutputStream os;
private String message;
public Sender(OutputStream os) {
this.os = os;
start();
public synchronized void send(String msg) {
message = msg;
notify();
public synchronized void run() {
while (true) {
// If no client to deal, wait until one connects
if (message == null) {
try {
wait();
} catch (InterruptedException e) {
if (message == null) {
break;
try {
os.write(message.getBytes());
os.write("\r\n".getBytes());
} catch (IOException ioe) {
ioe.printStackTrace();
// Completed client handling, return handler to pool and
// mark for wait
message = null;
public synchronized void stop() {
message = null;
notify();
Server:
package socket;
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class Server implements Runnable, CommandListener {
private SocketMIDlet parent;
private Display display;
private Form f;
private StringItem si;
private TextField tf;
private boolean stop;
private Command sendCommand = new Command("Send", Command.ITEM, 1);
private Command exitCommand = new Command("Exit", Command.EXIT, 1);
InputStream is;
OutputStream os;
SocketConnection sc;
ServerSocketConnection scn;
Sender sender;
public Server(SocketMIDlet m) {
parent = m;
display = Display.getDisplay(parent);
f = new Form("Socket Server");
si = new StringItem("Status:", " ");
tf = new TextField("Send:", "", 30, TextField.ANY);
f.append(si);
f.append(tf);
f.addCommand(exitCommand);
f.setCommandListener(this);
display.setCurrent(f);
public void start() {
Thread t = new Thread(this);
t.start();
public void run() {
try {
si.setText("Waiting for connection");
scn = (ServerSocketConnection)Connector.open("socket://:4000");
// Wait for a connection.
sc = (SocketConnection)scn.acceptAndOpen();
si.setText("Connection accepted");
is = sc.openInputStream();
os = sc.openOutputStream();
sender = new Sender(os);
// Allow sending of messages only after Sender is created
f.addCommand(sendCommand);
while (true) {
StringBuffer sb = new StringBuffer();
int c = 0;
while (((c = is.read()) != '\n') && (c != -1)) {
sb.append((char)c);
if (c == -1) {
break;
si.setText("Message received - " + sb.toString());
stop();
si.setText("Connection is closed");
f.removeCommand(sendCommand);
} catch (IOException ioe) {
if (ioe.getMessage().equals("ServerSocket Open")) {
Alert a = new Alert("Server", "Port 5000 is already taken.", null, AlertType.ERROR);
a.setTimeout(Alert.FOREVER);
a.setCommandListener(this);
display.setCurrent(a);
} else {
if (!stop) {
ioe.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
public void commandAction(Command c, Displayable s) {
if ((c == sendCommand) && !parent.isPaused()) {
sender.send(tf.getString());
if ((c == Alert.DISMISS_COMMAND) || (c == exitCommand)) {
parent.notifyDestroyed();
parent.destroyApp(true);
* Close all open streams
public void stop() {
try {
stop = true;
if (is != null) {
is.close();
if (os != null) {
os.close();
if (sc != null) {
sc.close();
if (scn != null) {
scn.close();
} catch (IOException ioe) {
Client connects to server...server can send messages to server..but clients
message does not reach server..that it cant be observed on server..how to debug jar file on mobile??

Is my code right?(J2ME socket communication)

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