springboot本地启动报错discard long time none received connection

 进到源码搜索这句「discard long time none received connection.」报错，在「com.alibaba.druid.pool.DruidAbstractDataSource#testConnectionInternal(com.alibaba.druid.pool.DruidConnectionHolder, java.sql.Connection)」找到如下代码：if (valid && isMySql) { // unexcepted branchlong lastPacketReceivedTimeMs = MySqlUtils.getLastPacketReceivedTimeMs(conn);if (lastPacketReceivedTimeMs > 0) {long mysqlIdleMillis = currentTimeMillis - lastPacketReceivedTimeMs;if (lastPacketReceivedTimeMs > 0 //&& mysqlIdleMillis >= timeBetweenEvictionRunsMillis) {discardConnection(holder);String errorMsg = "discard long time none received connection. "+ ", jdbcUrl : " + jdbcUrl+ ", version : " + VERSION.getVersionNumber()+ ", lastPacketReceivedIdleMillis : " + mysqlIdleMillis;LOG.warn(errorMsg);return false;}}
}
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我来解释一下，MySqlUtils.getLastPacketReceivedTimeMs(conn) 是获取上一次使用的时间，mysqlIdleMillis 就是计算出来空闲的时间，timeBetweenEvictionRunsMillis 是个写死的值 60秒，if (lastPacketReceivedTimeMs > 0 && mysqlIdleMillis >= timeBetweenEvictionRunsMillis) 就是如果连接空闲了 60秒以上，那就 discardConnection(holder) 丢弃这个旧连接并顺带打印了一个日志 LOG.warn(errorMsg)。
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【转】Alibaba 的 druid 报错 discard long time none received connection. 问题
https://blog.51cto.com/u_15101595/2625323
错误的原因是druid池子初始化的
在项目的Application添加下面注解即可：

static {System.setProperty("druid.mysql.usePingMethod", "false");
}

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