Error configuring AutoCommit. Your driver may not support getAutoCommit() or setAutoCommit(). Reque

报错信息

==> Parameters: 1346267346220478465(Long), ExceptionFactory.java(String), 10.42.23.1(String), GET(String), org.apache.ibatis.exceptions.ExceptionFactory(String), wrapException(String), Mozilla/5.0 (iPhone; CPU iPhone OS 14_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148(String), /crm-activiti/ordertaking/claim-list(String), 
### Error querying database.  Cause: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.
### The error may exist in org/activiti/db/mapping/entity/Task.xml
### The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.selectTaskByQueryCriteria
### The error occurred while executing a query
### Cause: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.(String), current=1&size=10&account=&status=1&custName=&roles=prov_310000(String), prod(String), a01-order-crm-vipkf-deploy-7fcb74969f-2nbrw(String), (String), 2021-01-05 09:28:42.433(Timestamp), 10.42.7.177:8050(String), org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.
### The error may exist in org/activiti/db/mapping/entity/Task.xml
### The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.selectTaskByQueryCriteria
### The error occurred while executing a query
### Cause: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
	at org.activiti.engine.impl.db.DbSqlSession.selectListWithRawParameter(DbSqlSession.java:409)
	at org.activiti.engine.impl.db.DbSqlSession.selectList(DbSqlSession.java:379)
	at org.activiti.engine.impl.db.DbSqlSession.selectList(DbSqlSession.java:370)
	at org.activiti.engine.impl.persistence.entity.data.impl.MybatisTaskDataManager.findTasksByQueryCriteria(MybatisTaskDataManager.java:66)
	at org.activiti.engine.impl.persistence.entity.TaskEntityManagerImpl.findTasksByQueryCriteria(TaskEntityManagerImpl.java:259)
	at org.activiti.engine.impl.TaskQueryImpl.executeList(TaskQueryImpl.java:1358)
	at org.activiti.engine.impl.AbstractQuery.executeSingleResult(AbstractQuery.java:184)
	at org.activiti.engine.impl.AbstractQuery.execute(AbstractQuery.java:165)
	at org.activiti.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:37)
	at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:78)
	at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57)
	at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42)
	at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)
	at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:63)
	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:35)
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
	at org.activiti.engine.impl.AbstractQuery.singleResult(AbstractQuery.java:128)
	at org.springblade.activiti.order.service.impl.OrderTakingServiceImpl.buildFlowTask(OrderTakingServiceImpl.java:442)
	at org.springblade.activiti.order.service.impl.OrderTakingServiceImpl.coverBladeActiviti(OrderTakingServiceImpl.java:418)
	at org.springblade.activiti.order.service.impl.OrderTakingServiceImpl$$FastClassBySpringCGLIB$$c33cfcb6.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:685)
	at org.springblade.activiti.order.service.impl.OrderTakingServiceImpl$$EnhancerBySpringCGLIB$$3c87bcf1.coverBladeActiviti(<generated>)
	at org.springblade.activiti.order.controller.OrderTakingController.claimList$original$7dgFS71a(OrderTakingController.java:106)
	at org.springblade.activiti.order.controller.OrderTakingController.claimList$original$7dgFS71a$accessor$yCPm2jo1(OrderTakingController.java)
	at org.springblade.activiti.order.controller.OrderTakingController$auxiliary$7m77j9ZD.call(Unknown Source)
	at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93)
	at org.springblade.activiti.order.controller.OrderTakingController.claimList(OrderTakingController.java)
	at org.springblade.activiti.order.controller.OrderTakingController$$FastClassBySpringCGLIB$$41cebf5e.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:750)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
	at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)
	at org.springblade.core.log.aspect.RequestLogAspect.aroundApi(RequestLogAspect.java:110)
	at sun.reflect.GeneratedMethodAccessor263.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689)
	at org.springblade.activiti.order.controller.OrderTakingController$$EnhancerBySpringCGLIB$$8759f4c6.claimList(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:893)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:798)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:645)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
	at org.springblade.core.log.filter.LogTraceFilter.doFilter(LogTraceFilter.java:39)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.jasig.cas.client.util.AssertionThreadLocalFilter.doFilter(AssertionThreadLocalFilter.java:50)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.jasig.cas.client.util.HttpServletRequestWrapperFilter.doFilter(HttpServletRequestWrapperFilter.java:71)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at com.yd.cas.client.slo.YDSSOCasAuthenticationFilter.doFilter(YDSSOCasAuthenticationFilter.java:133)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.jasig.cas.client.validation.AbstractTicketValidationFilter.doFilter(AbstractTicketValidationFilter.java:299)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.jasig.cas.client.session.SingleSignOutFilter.doFilter(SingleSignOutFilter.java:122)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:94)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:151)
	at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:86)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
	at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
	at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
	at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
	at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)
	at io.undertow.server.Connectors.executeRootHandler$original$0oT7fC2g(Connectors.java:376)
	at io.undertow.server.Connectors.executeRootHandler$original$0oT7fC2g$accessor$Uj3DFVQL(Connectors.java)
	at io.undertow.server.Connectors$auxiliary$NVQcgiNV.call(Unknown Source)
	at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.StaticMethodsInter.intercept(StaticMethodsInter.java:86)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.transaction.TransactionException: Error configuring AutoCommit.  Your driver may not support getAutoCommit() or setAutoCommit(). Requested setting: false.  Cause: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:107)
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:142)
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:60)
	at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:336)
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:85)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
	... 137 more
Caused by: java.sql.SQLNonTransientConnectionException: No operations allowed after connection closed.
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:110)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:89)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:63)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:73)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:73)
	at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2054)
	at org.apache.commons.dbcp.DelegatingConnection.setAutoCommit(DelegatingConnection.java:371)
	at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.setAutoCommit(PoolingDataSource.java:328)
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:102)
	... 147 more
Caused by: com.mysql.cj.exceptions.ConnectionIsClosedException: No operations allowed after connection closed.
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
	at com.mysql.cj.NativeSession.checkClosed(NativeSession.java:1209)
	at com.mysql.cj.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:567)
	at com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2004)
	... 150 more
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: The last packet successfully received from the server was 52,890,359 milliseconds ago.  The last packet sent successfully to the server was 52,890,359 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.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
	at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
	at com.mysql.cj.protocol.a.NativeProtocol.send(NativeProtocol.java:572)
	at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:633)
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:949)
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:895)
	at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1111)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery$original$yqcGj1Wt(StatementImpl.java:1168)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery$original$yqcGj1Wt$accessor$4Hl1dnEX(StatementImpl.java)
	at com.mysql.cj.jdbc.StatementImpl$auxiliary$hoAXY6s9.call(Unknown Source)
	at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java)
	at com.mysql.cj.jdbc.DatabaseMetaData.getUserName(DatabaseMetaData.java:4079)
	at org.apache.commons.dbcp.DelegatingConnection.toString(DelegatingConnection.java:123)
	at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.toString(PoolingDataSource.java:355)
	at java.lang.String.valueOf(String.java:2994)
	at java.lang.StringBuilder.append(StringBuilder.java:131)
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.setDesiredAutoCommit(JdbcTransaction.java:100)
	... 147 more
Caused by: java.net.SocketException: Broken pipe (Write failed)
	at java.net.SocketOutputStream.socketWrite0(Native Method)
	at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)
	at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
	at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
	at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
	at com.mysql.cj.protocol.a.SimplePacketSender.send(SimplePacketSender.java:55)
	at com.mysql.cj.protocol.a.TimeTrackingPacketSender.send(TimeTrackingPacketSender.java:50)
	at com.mysql.cj.protocol.a.NativeProtocol.send(NativeProtocol.java:563)
	... 162 more
(String), 30(Integer), blade-api(String), org.apache.ibatis.exceptions.PersistenceException(String)

原因是我使用的驱动

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://ip:3306/activiti?useSSL=false&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&transformedBitIsBoolean=true&serverTimezone=GMT%2B8&nullCatalogMeansCurrent=true&allowPublicKeyRetrieval=true" />
        <property name="username" value="xxxx" />
        <property name="password" value="xxxx" />
    </bean>

我是用的是

<property name="driverClassName" value="com.mysql.jdbc.Driver" />

这个驱动会让
Spring Boot连接MySQL长时间不连接后报错

`com.mysql.cj.core.exceptions.ConnectionIsClosedException: No operations allowed after connection closed.

添加&autoReconnect=true也无济于事，此选项好像仅对 MySQL 5之前的版本有效。

原因：

查看了Mysql的文档，以及Connector/J的文档以及在线说明发现，出现这种异常的原因是：
Mysql服务器默认的“wait_timeout”是8小时，也就是说一个connection空闲超过8个小时，Mysql将自动断开该connection。这就是问题的所在，在C3P0 pools中的connections如果空闲超过8小时，Mysql将其断开，而C3P0并不知道该connection已经失效，如果这时有Client请求connection，C3P0将该失效的Connection提供给Client，将会造成上面的异常。

解决方案

解决的方法有3种：

1. 增加 wait_timeout 的时间。
2. 减少 Connection pools 中 connection 的 lifetime。
3. 测试 Connection pools 中 connection 的有效性。

当然最好的办法是同时综合使用上述3种方法，下面就 DBCP、C3P0 和 simple jdbc dataSource 分别做一说明，假设 wait_timeout 为默认的8小时

DBCP 增加以下配置信息:

validationQuery = "select 1"

testWhileIdle = "true"

//some positive integer
timeBetweenEvictionRunsMillis = 3600000

//set to something smaller than 'wait_timeout'
minEvictableIdleTimeMillis = 18000000

//if you don't mind a hit for every getConnection(), set to "true"
testOnBorrow = "true"

C3P0 增加以下配置信息:

//获取connnection时测试是否有效
testConnectionOnCheckin = true

//自动测试的table名称
automaticTestTable=C3P0TestTable

//set to something much less than wait_timeout, prevents connections from going stale
idleConnectionTestPeriod = 18000

//set to something slightly less than wait_timeout, preventing 'stale' connections from being handed out
maxIdleTime = 25000

//if you can take the performance 'hit', set to "true"
testConnectionOnCheckout = true

simple jdbc dataSource 增加以下配置信息:

Pool.PingQuery = select 1

Pool.PingEnabled = true

Pool.PingConnectionsOlderThan = 0

//对于空闲的连接一个小时检查一次
Pool.PingConnectionsNotUsedFor = 3600000

临时解决办法(本人用的便是这个方案)

因为上面的办法需要修改数据库，但是我不想改数据库。所以：
修改一下连接MySQL的驱动（修改application.properties）：
从

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

改为

spring.datasource.driverClassName=com.mysql.jdbc.Driver

总结

使用jdbc原始的驱动应该是每一次查询都新建了一个连接；
而spring boot推荐的cj的这个驱动应该是先建立了一个连接（池），一直不断开，然后之后的查询都是从这个连接里面进行的，而MySQL在和这个连接连接了几个小时后就会断开这个连接。
虽然效率上来说cj这个连接池的方式更快。

我是观看了这篇文章：
链接: https://www.cnblogs.com/zifeiy/p/9282230.html