new ObjectInputStream() blocks

public class SerProg {


    static ServerSocket ser=null;
    static Socket cli=null;
    static ObjectInputStream ins=null;
    static ObjectOutputStream outs=null;


    public static void main(String[] args) {

        try {

            ser=new ServerSocket(9000,10);
            cli=ser.accept();

            System.out.println("Connected to :"+cli.getInetAddress().getHostAddress()+" At Port :"+cli.getLocalPort());

            ins=new ObjectInputStream(cli.getInputStream());
            outs=new ObjectOutputStream(cli.getOutputStream());

            String str=(String)ins.readObject();


        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

}

And the Client

public class SerProg {

    /**
     * @param args
     */
    static ServerSocket ser=null;
    static Socket cli=null;
    static ObjectInputStream ins=null;
    static ObjectOutputStream outs=null;


    public static void main(String[] args) {
        // TODO Auto-generated method stub

        try {

            ser=new ServerSocket(9000,10);
            cli=ser.accept();

            System.out.println("Connected to :"+cli.getInetAddress().getHostAddress()+" At Port :"+cli.getLocalPort());

            ins=new ObjectInputStream(cli.getInputStream());
            outs=new ObjectOutputStream(cli.getOutputStream());

            String str=(String)ins.readObject();


        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

}

The Connection is established successfully but in the Server Code Line

ins=new ObjectInputStream(cli.getInputStream());

the code halts and does not proceed,what might be the problem ??