private void writeHeader(MethodInvocation mi, DataOutputStream dos) throws IOException
private void writeHeader(MethodInvocation mi, ObjectOutputStream dos) throws IOException
   private void writeHeader(MethodInvocation mi, DataOutputStream dos) throws IOException   {      int objectId = ((Integer)mi.getMetaData().getMetaData(Dispatcher.DISPATCHER, Dispatcher.OID)).intValue();            dos.writeInt(objectId);            dos.writeLong(mi.getMethodHash());   }