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2018-05-08 21:33:11.582 WARN --- [pool-4-thread-1] c.alibaba.druid.pool.DruidDataSource : not full timeout retry : 1 2018-05-08 21:33:12.187 ERROR --- [pool-4-thread-1] o.s.s.s.TaskUtils$LoggingErrorHandler : Unexpected error occurred in scheduled task. org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 600, active 0, maxActive 250 ### The error may exist in mybatisMapper/TagBack.xml ### The error may involve demo.mapper.TagBackMapper.getValidTags ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 600, active 0, maxActive 250 at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:76) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:399) at com.sun.proxy.$Proxy51.selectList(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:205) at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) at com.sun.proxy.$Proxy73.getValidTags(Unknown Source) at demo.service.ImportDataService.begin(ImportDataService.java:51) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65) at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 600, active 0, maxActive 250 ### The error may exist in mybatisMapper/TagBack.xml ### The error may involve demo.mapper.TagBackMapper.getValidTags ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 600, active 0, maxActive 250 at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:386) ... 20 common frames omitted Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 600, active 0, maxActive 250 at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:82) at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:68) at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:315) at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:75) at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:61) at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303) at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49) at com.github.pagehelper.SqlUtil._processPage(SqlUtil.java:351) at com.github.pagehelper.SqlUtil.processPage(SqlUtil.java:329) at com.github.pagehelper.PageHelper.intercept(PageHelper.java:150) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61) at com.sun.proxy.$Proxy83.query(Unknown Source) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120) ... 26 common frames omitted Caused by: com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 600, active 0, maxActive 250 at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1190) at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1012) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4544) at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:662) at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4540) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:990) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:982) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:102) at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111) at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77) ... 46 common frames omitted 问题描述的是：在执行TagBack.xml中getValidTags语句时，获取连接超时。
为了排查连接为什么会超时，以及哪里没有释放连接
修改properties配置文件
spring.datasource.removeAbandoned=true #是否开启超时自动回收连接 spring.datasource.removeAbandonedTimeout=180 #设置自动回收连接的超时时间 spring.datasource.logAbandoned=true #打印回收连接时的错误日志 还在后续观察中。未完待续，希望有更多的小伙伴一同讨论，相互学习！
文章来源: Druid连接池连接泄露问题