> Druid版本：v1.2.18
最近项目中经常出现：com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 120000, active 0, maxActive 128, creating 0, createErrorCount 2，但是其他平台连接这个数据源正常的
于是做了一个实验复现了这个问题：
1. 先搞一个案例一直拿连接执行
2. 中途关闭数据库模拟网络问题或者数据库服务繁忙的情况 net stop mysql
3. 然后复现了GetConnectionTimeoutException的情况
4. 再开启数据库发现数据库连接没有恢复 net start mysql
解决办法：
//开启这两个配置就能实现断开重连了,如果没生效尝试升级一下版本1.2.16+
druidDataSource.setBreakAfterAcquireFailure(false);
druidDataSource.setKeepAlive(true);
public static void main(String[] args) throws Exception {Properties pro = new Properties();pro.setProperty(DruidDataSourceFactory.PROP_DRIVERCLASSNAME, "com.mysql.cj.jdbc.Driver");pro.setProperty(DruidDataSourceFactory.PROP_URL, "jdbc:mysql://localhost:3306/xxx?useCursorFetch=true");pro.setProperty(DruidDataSourceFactory.PROP_USERNAME, "root");pro.setProperty(DruidDataSourceFactory.PROP_PASSWORD, "123456");pro.setProperty(DruidDataSourceFactory.PROP_MAXWAIT, "120000");pro.setProperty(DruidDataSourceFactory.PROP_MAXACTIVE, "16");pro.setProperty(DruidDataSourceFactory.PROP_VALIDATIONQUERY, "select 1");DruidDataSource druidDataSource = (DruidDataSource) DruidDataSourceFactory.createDataSource(pro);druidDataSource.setConnectionErrorRetryAttempts(0);druidDataSource.setConnectTimeout(10*1000);druidDataSource.setSocketTimeout(90*1000);druidDataSource.setRemoveAbandoned(true);//开启这两个配置就能实现断开重连了,如果没生效尝试升级一下版本1.2.16+druidDataSource.setBreakAfterAcquireFailure(false);druidDataSource.setKeepAlive(true);druidDataSource.init();new Thread(() -> {for (int i = 0; i < 10000; i++) {try {DruidPooledConnection connection = druidDataSource.getConnection();Statement statement = connection.createStatement();ResultSet resultSet = statement.executeQuery("select * from xxx");while (resultSet.next()) {System.out.println(resultSet.getString("id"));}resultSet.close();statement.close();connection.close();Thread.sleep(1000);}catch (Exception e){log.error("error", e);}}}).start();Thread.sleep(30000000);}
