Broken pipe - Sun T2000, Solaris 10

Question

Hi,
I have some problems..
So, there's one system I'm working with. It's made of 2 parts (both written in Java):
- "normal" application, that works as a business logic server,
- web application (build on Turbine framework, running on a Resin Application Server) - it works as a presentation layer,
These 2 parts are connected via TCP/IP socket connection - we use an ObjectOutputStream.
It normally works just fine (it's running on several different systems), but recenlty it has been installed on a new server machine and it's started to throw strange exceptions. Below there are informations about server machine, exceptions and code making connections.
We think, that It may be a problem with configuration of Solaris kernel or TCP/IP stack, but have no idea how to fix it.
SERVER CONFIGURATION:
Machine: Sun T2000
System: Solaris 10
JVM: 1.4 or 1.5 (both were tested)
EXCEPTION:
ERROR 2006-11-28 11:28:59,377 [pl.com.ttsoft.vixen.currentday.server.ClientServiceThread] - IOException while sending data to the client. Closing output stream.
java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1682)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1591)
at java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1401)
at java.io.ObjectOutputStream.writeUnshared(ObjectOutputStream.java:371)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.sendMessageToClient(ClientServiceThread.java:679)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.sendModificationData(ClientServiceThread.java:432)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.serveDataModification(ClientServiceThread.java:308)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.run(ClientServiceThread.java:185)
ERROR 2006-11-28 11:28:59,400 [pl.com.ttsoft.vixen.currentday.server.ClientServiceThread] - IOException while closing client connection.
java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1682)
at java.io.ObjectOutputStream$BlockDataOutputStream.flush(ObjectOutputStream.java:1627)
at java.io.ObjectOutputStream.flush(ObjectOutputStream.java:666)
at java.io.ObjectOutputStream.close(ObjectOutputStream.java:687)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.closeClientConnection(ClientServiceThread.java:706)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.sendMessageToClient(ClientServiceThread.java:691)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.sendModificationData(ClientServiceThread.java:432)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.serveDataModification(ClientServiceThread.java:308)
at pl.com.ttsoft.vixen.currentday.server.ClientServiceThread.run(ClientServiceThread.java:185)
STANDALONE APPLICATION CODE:
/* i've simplified it */
/* OPENING CONNECITON */
          Socket socket = = new Socket(hostName, hostPort);
          ObjectOutputStream outStream = new ObjectOutputStream( socket.getOutputStream() );
          ClientDescriptor clientDescriptor =
            new ClientDescriptor(socket, outStream, info.getLogin(), info.getSystem(),
                info.getDay(), info.getCurrentDaySessionId());
/* SENDING DATA */
     private boolean sendMessageToClient( MessageDTO messageDTO, ClientDescriptor clientDescriptor )
          throws CurrentDayException {
          logger.info( "sendMessageToClient " + messageDTO.getClientId() );
          ObjectOutputStream outputStream = clientDescriptor.getOutputStream();
          try {
              outputStream.writeUnshared( messageDTO ); // THIS WRITE THROWS EXCEPTIONS
              outputStream.flush();
          } catch ( IOException exc ) {
            logger.error( " IOException while sending data to the client. Closing output stream. ", exc );
            // close client connection
            closeClientConnection( clientDescriptor );
            return false;
        return true;       
    private void closeClientConnection( ClientDescriptor clientDescriptor ) {
        try {
            synchronized ( clientDescriptorMap ) {
                clientDescriptor.setState( ClientDescriptor.TO_REMOVE );           
                clientDescriptor.getOutputStream().close();
                clientDescriptor.getSocket().close();
        } catch ( IOException exc ) {
            logger.error( " IOException while closing client connection. ", exc );
/* WEB APPLICATION */
/* RECIEVING DATA */
/* it routes this data to 3-rd party applet */
        SocketChannel vixenSocket = (SocketChannel)key.channel();
        Socket clientSocket = (Socket)objClientServers.get(key);
        // read the information from the socket....
        ByteBuffer buffer = ByteBuffer.allocate(16 * 1024);
        while (vixenSocket.read(buffer) > 0) {
            buffer.flip();
            byte[] bytespassed = new byte[buffer.remaining()];
            logger.debug("buffer.remaining() (1)=" + buffer.remaining());
            buffer.get(bytespassed, 0, bytespassed.length);
            clientSocket.getOutputStream().write(bytespassed);
            buffer.compact();
        buffer.flip();
        while (buffer.hasRemaining()) { // make sure the buffer is fully readed.
            byte[] bytespassed = new byte[buffer.remaining()];
            logger.debug("buffer.remaining() (2)=" + buffer.remaining());
            buffer.get(bytespassed, 0, bytespassed.length);
            clientSocket.getOutputStream().write(bytespassed);
        buffer.clear();We think, that It may be a problem with configuration of Solaris kernel or TCP/IP stack, but have no idea how to fix it.
Thanks for help,
Ziemek Obel.

Answer 1

Hi,
well I'm not sure if it isn't a hardware problem - you see, this system works just fine on a Solaris 10 working on the other servers, but tends to throw exceptions on Sun T2000 machine - so I guess It may be hardware issue and someone here could help me.
Ziemek.