(ObjectInputStream) first time it works, second time I get an error!

hi,
Using the following code I am sending a query to a server socket using a PrintWriter.println function and retrieve a vector object (results).
Client Code
     public Vector getDBResultSet(String query) throws ClientException, IOException{
          Object obj = new Object();
          if (socket != null)
               try{
                    System.out.println("Sending "+query+" to Server");
                    writer.println(query);
                    try{
                         ois = new ObjectInputStream(input);
                         while ((obj = ois.readObject()) != null)
                              obj = ois.readObject();
                    }catch (EOFException eofx){
                         System.out.println("EOF @ object input stream!");
                    finally{
                         ois.close();
                    return (Vector)obj;
               }catch(Exception e){
                    e.printStackTrace();
                    throw new ClientException("<html>Error: <br>"+e.toString()+"#"+e.getMessage()+"</html>");
               }finally{
                    //writer.close();
          }else throw new ClientException("no connection!");
     }Server side code
     public void communicate()
          try{
               while (true){
                    String q = reader.readLine();
                    Vector vec = db.getResults(q);
                    oos = new ObjectOutputStream(output);
                    oos.writeObject(vec);
                    oos.flush();
                    oos.close();
          }catch(Exception e){
               e.printStackTrace();
     }First time everything goes OK.
Second time on the Client-Side I get strange errors like "ClassCastException Java.lang.Object" and if I comment out the "while" line I get a "socket closed" error...
any ideas what is wrong with it?

Thank you. input and output variables are Inputstream and outputStream objects.
However if you notice, I open the ObjectInputStream inside getDBResultSet() method. So whenever this method is called a new ObjectIputStream shall be initialized. That is why I close the ObjectInput/outputStreams right after the try/catch portion.
I tried starting the ObjectInputStream inside the connect method (which initialized the connection with the ServerSocket object) but wheneven connect() was called the GUI hanged!
I don't know what am I doing wrong...
     public void connect() throws Exception
          if (socket == null){
               try{
                    System.out.println("opening connection...to "+host+" at port "+port);
                    socket = new Socket(host, port);
                    input = socket.getInputStream();
                    output = socket.getOutputStream();
                    in = new DataInputStream(input);
                    out = new DataOutputStream(output);
                    reader = new BufferedReader(new InputStreamReader(in));
                    writer = new PrintWriter(out, true);
                    //ois = new ObjectInputStream(input);
                    System.out.println("Connection established!");
               }catch(IOException e){
                    try{
                         if (socket != null)
                              socket.close();
                         System.out.println("ERROR WHILE CONNECTING... SOCKET IS NOW CLOSED!");
                    }catch(IOException x){
                         x.printStackTrace();
          else
               throw new ClientException("connection active!");
     }

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