GetConnectionTimeoutException解决方案之一

[CHINAJAVABoy]

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);
    }

[ssq667]

我最近也遇到类似的问题 wating 50000 ，active500 maxActive 5000 ,creating 0 ,

[CHINAJAVABoy]

我最近也遇到类似的问题 wating 50000 ，active500 maxActive 5000 ,creating 0 ,
不是同一个问题，你这个是连接数不够了，500个都不够很可能是出现了连接泄漏