本文详细记录了一次因MySQL连接超时导致的应用异常，并提供了详细的解决方案，包括调整数据库配置参数、增加连接验证机制等。
异常报错：
2017-02-13 09:30:17.597 [startQuertz_Worker-6] ERROR com.autoyol.task.TransStatManageTask#execute [line:257] - 定时任务6. 出错org.springframework.dao.RecoverableDataAccessException: ### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 44,997,436 milliseconds ago. The last packet sent successfully to the server was 44,997,437 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. ### The error may exist in com/autoyol/mapper/trans/TransMapper.xml ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: ~ ### Cause: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 44,997,436 milliseconds ago. The last packet sent successfully to the server was 44,997,437 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. ; SQL []; The last packet successfully received from the server was 44,997,436 milliseconds ago. The last packet sent successfully to the server was 44,997,437 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 44,997,436 milliseconds ago. The last packet sent successfully to the server was 44,997,437 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:98) ~[spring-jdbc-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73) ~[spring-jdbc-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) ~[spring-jdbc-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:74) ~[mybatis-spring-1.2.3.jar:1.2.3] at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:399) ~[mybatis-spring-1.2.3.jar:1.2.3] at com.sun.proxy.$Proxy34.selectList(Unknown Source) ~[na:na] at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:205) ~[mybatis-spring-1.2.3.jar:1.2.3] at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53) ~[mybatis-3.3.0.jar:3.3.0] at com.sun.proxy.$Proxy43.queryAfterXhStartTransRenterInfoList(Unknown Source) ~[na:na] at com.autoyol.service.trans.TransService.queryAfterXhStartTransRenterInfoList(TransService.java:3859) ~[auto-service-1.0-SNAPSHOT.jar:1.0-SNAPSHOT] at com.autoyol.service.trans.TransService$$FastClassBySpringCGLIB$$82326640.invoke(<generated>) ~[spring-core-4.0.9.RELEASE.jar:1.0-SNAPSHOT] at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:708) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) ~[spring-tx-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) ~[spring-tx-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) ~[spring-tx-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at com.autoyol.service.trans.TransService$$EnhancerBySpringCGLIB$$d1bda840.queryAfterXhStartTransRenterInfoList(<generated>) ~[spring-core-4.0.9.RELEASE.jar:1.0-SNAPSHOT] at com.autoyol.service.trans.TransTaskService.transNotify(TransTaskService.java:983) ~[auto-service-1.0-SNAPSHOT.jar:1.0-SNAPSHOT] at com.autoyol.service.trans.TransTaskService$$FastClassBySpringCGLIB$$13fabb7b.invoke(<generated>) ~[spring-core-4.0.9.RELEASE.jar:1.0-SNAPSHOT] at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:708) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98) ~[spring-tx-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262) ~[spring-tx-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) ~[spring-tx-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644) ~[spring-aop-4.0.9.RELEASE.jar:4.0.9.RELEASE] at com.autoyol.service.trans.TransTaskService$$EnhancerBySpringCGLIB$$d89a1841.transNotify(<generated>) ~[spring-core-4.0.9.RELEASE.jar:1.0-SNAPSHOT] at com.autoyol.task.TransStatManageTask.execute(TransStatManageTask.java:255) ~[auto-service-1.0-SNAPSHOT.jar:1.0-SNAPSHOT] at sun.reflect.GeneratedMethodAccessor3972.invoke(Unknown Source) ~[na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:269) [spring-core-4.0.9.RELEASE.jar:4.0.9.RELEASE] at com.autoyol.quartz.BeanInvokingJobDetailFactoryBean$BeanInvokingJob.execute(BeanInvokingJobDetailFactoryBean.java:486) [BeanInvokingJobDetailFactoryBean$BeanInvokingJob.class:na] at org.quartz.core.JobRunShell.run(JobRunShell.java:223) [quartz-1.8.6.jar:na] at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549) [quartz-1.8.6.jar:na] Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 44,997,436 milliseconds ago. The last packet sent successfully to the server was 44,997,437 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. at sun.reflect.GeneratedConstructorAccessor471.newInstance(Unknown Source) ~[na:na] at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_101] at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_101] at com.mysql.jdbc.Util.handleNewInstance(Util.java:389) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1038) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3609) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2417) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2535) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.MultiHostMySQLConnection.execSQL(MultiHostMySQLConnection.java:140) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1911) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1203) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at sun.reflect.GeneratedMethodAccessor129.invoke(Unknown Source) ~[na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] at com.mysql.jdbc.MultiHostConnectionProxy$JdbcInterfaceProxy.invoke(MultiHostConnectionProxy.java:91) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] at com.sun.proxy.$Proxy39.execute(Unknown Source) ~[na:na] at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:62) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:78) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120) ~[mybatis-3.3.0.jar:3.3.0] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113) ~[mybatis-3.3.0.jar:3.3.0] at sun.reflect.GeneratedMethodAccessor149.invoke(Unknown Source) ~[na:na] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:386) ~[mybatis-spring-1.2.3.jar:1.2.3] ... 40 common frames omitted Caused by: java.net.SocketException: Connection timed out at java.net.SocketOutputStream.socketWrite0(Native Method) ~[na:1.8.0_101] at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109) ~[na:1.8.0_101] at java.net.SocketOutputStream.write(SocketOutputStream.java:153) ~[na:1.8.0_101] at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82) ~[na:1.8.0_101] at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140) ~[na:1.8.0_101] at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3591) ~[mysql-connector-java-5.1.35-bin.jar:5.1.35] ... 64 common frames omitted
2.mysql数据库的配置
# 28800 8小时 # 21600 6小时
SET GLOBAL wait_timeout=21600; SHOW GLOBAL VARIABLES LIKE 'wait_timeout';
3.缺少如下配置项：
<property name="validationQuery"><value>SELECT 1</value></property>
<property name="testOnBorrow"><value>true</value></property> <property name="testOnReturn"><value>true</value></property>
I had used the same settings in pure JDBC projects few times before and never encoutered similar exception so now I wanted to ask uncle Google for some answers At the beginning I dove into the MySQL manual to check why autoReconnect isn’t enough in my application but found nothing relevant to my problem. After some thinking I got the idea that maybe some settings in Commons-DBCP are missing so I read dbcp configuration to find that connection could be validated before real usage by specifing two parameters: testOnBorrow=“true” validationQuery=“select 1” . As written in docs:
testOnBorrow – The indication of whether objects will be validated before being borrowed from the pool. If the object fails to validate, it will be dropped from the pool, and we will attempt to borrow another. NOTE – for a true value to have any effect, the validationQuery parameter must be set to a non-null string.
validationQuery – The SQL query that will be used to validate connections from this pool before returning them to the caller. If specified, this query MUST be an SQL SELECT statement that returns at least one row.
Link:http://tomaszdziurko.com/2010/06/solving-com-mysql-jdbc-exceptions-jdbc4-communicationsexception-in-spring-jdbc-based-application
4.完整的数据源配置参考：
<bean id="settleDataSource" class="org.apache.tomcat.jdbc.pool.DataSource"> <property name="driverClassName"><value>${settleDataSource.driverClassName}</value></property> <property name="url"><value>${settleDataSource.url}</value></property> <property name="username" ><value>${settleDataSource.username}</value></property> <property name="password"><value>${settleDataSource.password}</value></property> <property name="maxIdle" value="20" /><!--最大空闲连接 --> <property name="minIdle" value="10" /> <!--最小空闲连接 --> <property name="maxActive"><value>200</value></property> <!-- 连接池的最大数据库连接数。设为0表示无限制。 --> <property name="initialSize"><value>10</value></property> <!-- 初始化连接数量 --> <property name="maxWait" value="10000"/> <!-- 最大建立连接等待时间。如果超过此时间将接到异常。设为-1表示无限制。 --> <property name="removeAbandoned" value="true"/> <!-- 是否自动回收超时连接--> <property name="removeAbandonedTimeout" value="600" /><!-- 泄露的连接可以被删除的超时值， 单位秒应设置为应用中查询执行最长的时间,单位为秒 --> <property name="validationInterval" value="60000"/> <!--检查连接死活的时间间隔（单位：毫妙） 0以下的话不检查。默认是0。 --> <property name="validationQuery"><value>SELECT 1</value></property> <property name="testOnBorrow"><value>true</value></property> <property name="testOnReturn"><value>true</value></property> <property name="testWhileIdle"><value>true</value></property> <!-- 验证失败时，是否将连接从池中丢弃 --> </bean>
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