static   void  fillBlob (Connection conn, BLOB blob,  long  offset,  long  length)
     throws  Exception
    {
    OutputStream outstream = blob.getBinaryOutputStream(offset);
     int  i =  0 ;
     int  chunk =  10 ;
     byte  [] data = {  1 ,  1 ,  3 ,  1 ,  1 ,  1 ,  1 ,  1 ,  1 ,  1 ,  8 ,  8 ,  7  };
     while  (i < length)
    {
    outstream.write(data,  0 , chunk);
    i += chunk;
     if  (length - i < chunk)
    chunk = ( int ) length - i;
    }
    outstream.close();
    }

fillBlob (conn, blob,  11 ,  50 ); 

outstream.write(data, i, chunk);

outstream.write(data,  0 , chunk);

 
OutputStream outstream = blob.getBinaryOutputStream();
ObjectOutputStream oos =  new  ObjectOutputStream(outstream);
...

 while  (iter.next()) {
   oos.writeInt(iter.ID());
   oos.writeObject(iter.A1());
   oos.writeObject(iter.A2());
   oos.writeObject(iter.A3());   
   }