public class DataBaseViewServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        CouchbaseClient client = ConnectionManager.getClient();
        View view = client.getView("1", "1");
        Query query = new Query();
        query.setIncludeDocs(true).setLimit(5); // include all docs and limit to 5
        ViewResponse result = client.query(view, query);

// Iterate over the result and print the key of each document:
        for(ViewRow row : result) {
            System.out.println(row.getId());
            // The full document (as String) is available through row.getDocument();
        }
    }
}

java.lang.NullPointerException
	DataBaseViewServlet.doGet(DataBaseViewServlet.java:20)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:618)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

public class ConnectionManager {
    Logger logger = Logger.getLogger(getClass().getName());
    private static CouchbaseClient client;

    public ConnectionManager() {
        init();
    }

    public void init() {
        try {
            logger.info("Opening base connection.");
            List<URI> hosts = Arrays.asList(new URI("http://127.0.0.1:8091/pools"));

            String bucket = "1";

            String password = "";

            client = new CouchbaseClient(hosts, bucket, password);
        } catch (Exception e) {
            client = null;
            throw new IllegalStateException(e);
        }
    }

    @PreDestroy
    public void destroy() {
        logger.info("Closing base connection.");
        if (client != null) {
            client.shutdown();
            client = null;
        }
    }

    public static CouchbaseClient getClient() {
        return client;
    }
}