使用druid连接池 出现 The last packet successfully receive

使用druid连接池 出现 Caused by: com.mysql.cj.exceptions.CJCommunicationsException: The last packet successfully received from the server was 40,613,430 milliseconds ago，
我已经设置testOnBorrow为true

private String validationQuery = "select 1";
private int validationQueryTimeout = -1;
private boolean testOnBorrow = true;
private boolean testOnReturn = false;
private boolean testWhileIdle = true;
任然出现这样的问题，而且mysql数据库的wait_timeout也是默认的8小时

在链接字符串上加上failOverReadOnly=false试了试

加上failOverReadOnly=false之后大约十天没有出现问题，但大概十天后又报了这个错误，请大佬指点