error sending contents in 2D ByteArray over LAN using Java IDL

[s ravi chandran]

hi
I am trying to send a 2D byte array with some string content over a LAN network, but I am getting certain errors. This code is working perfectly in the local system. I was able to successfully pass content using ByteArray, but with 2D ByteArray, some strange sequence is happening.. This is the IDL file:

module HelloApp{

// creating Byte Array.
typedef sequence<octet> byteArray;

// creating 2D Byte Array.
typedef sequence<byteArray> fileArray;


interface Hello
{
  void  sayHello(in fileArray bytes);
};

};

the moment the client calls the server method, I get this error at client side:

ERROR : java.lang.NullPointerException
java.lang.NullPointerException
        at HelloApp.byteArrayHelper.write(byteArrayHelper.java:58)
        at HelloApp.fileArrayHelper.write(fileArrayHelper.java:61)
        at HelloApp._HelloStub.sayHello(_HelloStub.java:21)
        at HelloClient.main(HelloClient.java:59)

and at the server side :

 com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl convertThrowableToSystemException
WARNING: "IOP01710201: (TRANSIENT) Request cancelled by exception"
org.omg.CORBA.TRANSIENT:   vmcid: SUN  minor code: 201  completed: No
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.requestCanceled(ORBUtilSystemException.java:8809)
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.requestCanceled(ORBUtilSystemException.java:8827)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.convertThrowableToSystemException(CorbaMessageMediatorImpl.java:1904)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleThrowableDuringServerDispatch(CorbaMessageMediatorImpl.java:1870)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleThrowableDuringServerDispatch(CorbaMessageMediatorImpl.java:1823)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1548)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:922)
        at com.sun.corba.se.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:181)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:694)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:451)
        at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1213)
        at com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.performWork(ThreadPoolImpl.java:471)
        at com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:500)
Caused by: com.sun.corba.se.impl.protocol.RequestCanceledException
        at com.sun.corba.se.impl.encoding.BufferManagerReadStream.underflow(BuferManagerReadStream.java:88)
        at com.sun.corba.se.impl.encoding.CDRInputStream_1_1.grow(CDRInputStrea_1_1.java:75)
        at com.sun.corba.se.impl.encoding.CDRInputStream_1_0.read_octet_array(CRInputStream_1_0.java:684)
        at com.sun.corba.se.impl.encoding.CDRInputStream.read_octet_array(CDRInutStream.java:177)
        at HelloApp.byteArrayHelper.read(byteArrayHelper.java:52)
        at HelloApp.fileArrayHelper.read(fileArrayHelper.java:53)
        at HelloApp._HelloImplBase._invoke(_HelloImplBase.java:41)
        at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.disptchToServant(CorbaServerRequestDispatcherImpl.java:637)
        at com.sun.corba.se.impl.protocol.CorbaServerRequestDispatcherImpl.disptch(CorbaServerRequestDispatcherImpl.java:189)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleRequesRequest(CorbaMessageMediatorImpl.java:1682)
        at com.sun.corba.se.impl.protocol.CorbaMessageMediatorImpl.handleReques(CorbaMessageMediatorImpl.java:1540)
        ... 7 more

This is the code where NullPointer seems to be coming from:

public static void write (org.omg.CORBA.portable.OutputStream ostream, byte[] value)
  {
    ostream.write_long (value.length);                                                      //(line number 58)
    ostream.write_octet_array (value, 0, value.length);
  }

Please help me debug the stacktrace.

Thanks