Java Development

[yogeswaran]

Hi all,

               When i try to push different data using  multiple threads simultaneously  in  a single socket connection .

For Eg: 

           Thread 1 Sends: message$uniID&Data=hi

           Thread 2 Sends: message$uniID&Data=hello

I found the data gets mingled  in our server some cases

 memessageage$un$uniID&iID&Data=Data=hihello

My code is

public void senddata(String data) {

        try {
            lastpacket = 0;
            msg += data;
            boolean isremaining = true;
            String resp = "";
            int sendLength = 0;
            while (isremaining) {
                packets = msg.substring(lastpacket * 1024);
                if (packets.length() > 1024) {
                    resp = packets;
                    sendLength = 1024;
                } else if (packets.length() > 0 && packets.length() <= 1024) {
                    lastpacket = 0;
                    resp = packets;
                    sendLength = resp.length();
                    msg = "";
                }

                String d = "";
                try {
                    d = resp.substring(0, sendLength);
                    _outputStream.write(resp, 0, sendLength);
                    lastpacket++;
                    _outputStream.flush();
                 
                    print("Flused -\n" + d);
                    msgcount++;


                } catch (Exception ex) {
                    print("writing err-" + ex.toString());
    isremaining = false;
                  Closesocket();
                }
                if (msg.length() == 0) {
                    isremaining = false;
                }

            }

        } catch (Exception e) {
            isremaining = false;

//          
        }

    } 

[RexDoug]

That looks like "expected behavior" to me, not a "Strange issue".

Whenever you have multiple threads sharing a single object, access to this object must be synchronized.

See the java keyword "synchronized"