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final public class CounterSocketServlet extends WebSocketServlet {
    @Override
    protected WebSocket doWebSocketConnect(final HttpServletRequest hsr,
                                           final String string) {
        return new CounterSocket();
    }
    final class CounterSocket implements WebSocket {
        private Outbound outbound;
        public void onConnect(final Outbound outbound) {
            System.out.println("onConnect");
            this.outbound = outbound;
        }
        public void onMessage(final byte frame, final String data) {
            System.out.println("onMessage");
            if (data.equals("Hello, Server!")) {
                new Thread() {
                    @Override
                    public void run() {
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