com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60006, active 20
貌似数据库链接数太小，系统没有反应，随后后台即报此错误。
调整value=20为value=2000
<!-- 连接池最大使用连接数量 -->
<property name="maxActive" value="2000" />
错误消失，具体视情况而定
com.alibaba.druid.pool.GetConnectionTimeoutException
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druid 异常 com.alibaba.druid.pool.GetConnectionTimeoutException
数据库连接池连接异常com.alibaba.druid.pool.GetConnectionTimeoutException
com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 5, maxActive 5, creating 0
com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 6000, active 20, maxActive 20
com.alibaba.druid.pool.DruidDataSource
com.alibaba.druid.pool.DruidDataSource
Canal Adapter com.alibaba.druid.pool.DruidDataSource cannot be cast to com.alibaba.druid.pool.DruidDataSource
com.alibaba.druid.pool.DruidDataSource : {dataSource-2} init error
Caused by: com.alibaba.druid.pool.DataSourceClosedException: dataSource already closed
Cannot find class [com.alibaba.druid.pool.DruidDataSuorce]