org.java_websocket.exceptions.WebsocketNotConnectedException: null

WebSocketClient连接webSocket服务端发送消息报错，错误信息如下：

 org.java_websocket.exceptions.WebsocketNotConnectedException: null
    at org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:630)
    at org.java_websocket.WebSocketImpl.send(WebSocketImpl.java:607)
    at org.java_websocket.client.WebSocketClient.send(WebSocketClient.java:344)

 通过查看源码可以发现当前的webSocket连接是not isOpen

如何解决？

while (!client.getReadyState().equals(ReadyState.OPEN)) {
        logger.debug("连接中···请稍后");
     }
client.send("hello,webSocket connected");