Networking Using Socket

Question

Hi,
My team have developed a real-time remote network monitoring system. It consists of server and agent. What the agent does is send the network traffic data to server every one second by using socket. Each second we send the data to the same socket and yes we already make sure that the socket and streams used are closed after data being sent. However I still see a lot of SocketException once in a while whenever the agent tries to send the data.
1. How can I solve this error ?
2. Is it possible that I connect to my server just once without closing the connection and still able to send the data every second ?
Thank you for your time.
Regards,
Mustafa
Below is the code, called every one second :
      * This method sends itself into the server using compressed input/output
      * stream and then will receive back the instance of "replied" CRequest and
      * then further returns it.
      * @return CRequest
     public CRequest sendRequest() {
          SSLSocket server = null;
          GZIPOutputStream gos = null;
          ObjectOutputStream out = null;
          BufferedOutputStream bos = null;
          GZIPInputStream gis = null;
          ObjectInputStream in = null;
          try {
               SSLSocketFactory sslFact = (SSLSocketFactory) SSLSocketFactory
                         .getDefault();
               server = (SSLSocket) sslFact.createSocket(hostname, port);
               String set[] = new String[] { "SSL_RSA_WITH_NULL_MD5" };
               server.setEnabledCipherSuites(set);
               server.setReceiveBufferSize(48000);
               server.setSendBufferSize(48000);
               if (milisecTimeout != 0) {
                    server.setSoTimeout(milisecTimeout);
               gos = new GZIPOutputStream(server.getOutputStream());
               bos = new BufferedOutputStream(gos, 48000);
               out = new ObjectOutputStream(bos);
               // /* Can we actually send ourselves and then receive ourselves?*/
               out.writeObject(this);
               out.flush();
               bos.flush();
               gos.finish();
               gis = new GZIPInputStream(server.getInputStream());
               in = new ObjectInputStream(new BufferedInputStream(gis, 48000));
               /* Returning the newly modified request with results */
               return (CRequest) in.readObject();
          } catch (Exception e) {
               System.out.println("trouble sending request" + e);
          } finally {
               if (gos != null) {
                    try {
                         gos.close();
                         // System.out.println("GOS closed..");
                    } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                    gos = null;
               if (out != null) {
                    try {
                         out.close();
                         // System.out.println("OUT closed..");
                    } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                    out = null;
               if (gis != null) {
                    try {
                         gis.close();
                         // System.out.println("GIS closed..");
                    } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                    gis = null;
               if (in != null) {
                    try {
                         in.close();
                         // System.out.println("IN closed..");
                    } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                    in = null;
               if (server != null) {
                    try {
                         server.close();
                    } catch (IOException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                    server = null;
               System.gc();
          return null;
     }

Answer 1

I've been trying to modify my sendRequest function, so that It will only open and close the connection ONCE. As long as the connection is open I need to be able to send some data to the server. However I've been getting errors and stuffs like that.
Exception:
java.io.NotSerializableException: java.io.BufferedOutputStream
+     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)+
+     at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)+
+     at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)+
+     at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)+
+     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)+
+     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)+
+     at com.inetmon.jn.commobj.CRequest.sendRealTimeRequest(CRequest.java:385)+
+     at com.inetmon.jn.core.internal.CaptureEngine.sendDataBackToServer(CaptureEngine.java:1420)+
+     at com.inetmon.jn.core.internal.CaptureEngine$4.actionPerformed(CaptureEngine.java:2384)+
+     at javax.swing.Timer.fireActionPerformed(Timer.java:271)+
+     at javax.swing.Timer$DoPostEvent.run(Timer.java:201)+
+     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)+
+     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)+
+     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)+
+     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)+
+     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)+
received is null
+     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)+
+     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)+
The constructor which only be called once.
public CRequest(Cookie cookie, int id, Object information, String hostname,
               int port) {
          this.cookie = cookie;
          this.type = RequestConstants.AGENT_SEND_REALTIME_DATA;
          this.id = id;
          this.information = information;
          this.hostname = hostname;
          this.port = port;
          try {
               SSLSocketFactory sslFact = (SSLSocketFactory) SSLSocketFactory
                         .getDefault();
               server = (SSLSocket) sslFact.createSocket(hostname, port);
               String set[] = new String[] { "SSL_RSA_WITH_NULL_MD5" };
               server.setEnabledCipherSuites(set);
               server.setReceiveBufferSize(48000);
               server.setSendBufferSize(48000);
               if (milisecTimeout != 0) {
                    server.setSoTimeout(milisecTimeout);
               gos = new GZIPOutputStream(server.getOutputStream());
               bos = new BufferedOutputStream(gos, 48000);
               out = new ObjectOutputStream(bos);
          } catch (Exception e) {
               System.out.println("trouble creating socket" + e);
     }The send request, which sends data whenever I want.
     public CRequest sendRealTimeRequest() {
          try {
               // gos = new GZIPOutputStream(server.getOutputStream());
               // bos = new BufferedOutputStream(gos, 48000);
               // out = new ObjectOutputStream(bos);
               // /* Can we actually send ourselves and then receive ourselves?*/
               out.writeObject(this);
               // out.flush();
               // bos.flush();
               // gos.finish();
               gis = new GZIPInputStream(server.getInputStream());
               in = new ObjectInputStream(new BufferedInputStream(gis, 48000));
               /* Returning the newly modified request with results */
               System.out.println("managed to send once");
               return (CRequest) in.readObject();
          } catch (Exception e) {
               e.printStackTrace();
          return null;
     }