Getting java.net.SocketException: Connection reset [duplicate]

I am trying to execute a simple Client/Server program.But whenever i am trying to execute , i am getting "java.net.SocketException: Connection reset" . why this exception occurs ? Any suggestion for me ?

Here is the code

SocServer.java

public static void main(String[] args) throws Exception
{
    System.out.println("Server is started");

    ServerSocket ss = new ServerSocket(8886);

    System.out.println("Server is waiting for client request");

    Socket s = ss.accept();

    System.out.println("Client Connected");

    BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));

    String str = br.readLine();

    System.out.println("Client Data" + str);

}

SocketClient.java

public static void main(String[] args) throws Exception 
{
    String ip = "localhost";
    int port = 8886;
    Socket s = new Socket(ip,port);

    String str = "Noman";

    OutputStreamWriter os = new OutputStreamWriter(s.getOutputStream());
    PrintWriter out = new PrintWriter(os);

    os.write(str);
    os.flush();
}