我有一个简单的Java WebSocket客户端。有时，与WebSocket服务器的连接可能会丢失。如果连接丢失，如何自动重新连接？

import javax.websocket.*;
import java.net.URI;

@ClientEndpoint
public class WebsocketClientEndpoint {

Session userSession = null;

public WebsocketClientEndpoint(URI endpointURI) {
    try {
        WebSocketContainer container = ContainerProvider.getWebSocketContainer();
        container.connectToServer(this, endpointURI);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

@OnOpen
public void onOpen(Session userSession) {
    System.out.println("Opening websocket");
    this.userSession = userSession;
}

@OnClose
public void onClose(Session userSession, CloseReason reason) {
    System.out.println("Closing websocket");
    this.userSession = null;
}

@OnMessage
public void onMessage(String message) {
    System.out.println("Received message: "+ message);
}

public void sendMessage(String message) {
    this.userSession.getAsyncRemote().sendText(message);
}
}

测试应用程序

import java.net.URI;
import java.net.URISyntaxException;
public class TestApp {

public static void main(String[] args) {
    try {
        final WebsocketClientEndpoint clientEndPoint = new WebsocketClientEndpoint(new URI("ws://localhost:8080/websocket/api"));

        while (true) {
            Thread.sleep(30000);
        }

    } catch (Exception ex) {
        System.err.println("Exception: " + ex.getMessage());
    }
}
}

Java中有简单的WebSocket客户端和测试类。有时，与WebSocket服务器的连接可能会丢失。如果连接丢失，如何自动重新连接？