MySQL之—使用c3p0与DBCP连接池，造成的MySql 8小时问题的详细代码解决方案

本文详细描述MySQL之—使用c3p0与DBCP连接池，造成的MySql 8小时问题的详细代码解决方案，具有一定参考价值，下面是详述。

一、问题描述

最近在做一个Java Web项目，框架为Spring MVC+JPA，使用c3p0连接池，发布环境为Tomcat 7，项目运行一段时间（大概几个小时），之后访问时会出现第一次访问报错，再次访问正常的现象，且多次出现此问题。以下是报错日志：

org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nest<div>本文来源gaodai^.ma#com搞#代!码网</div>ed exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin transaction failed:           at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:428)          at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372)          at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:417)          at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:255)          at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)          at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)          at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631)          at com.appcarcare.cube.service.UserService    EnhancerByCGLIB    a4429cba.getUserDao(<generated>)                at com.appcarcare.cube.servlet.DataCenterServlet$SqlTimer.connectSql(DataCenterServlet.java:76)          at com.appcarcare.cube.servlet.DataCenterServlet$SqlTimer.run(DataCenterServlet.java:70)          at java.util.TimerThread.mainLoop(Timer.java:555)          at java.util.TimerThread.run(Timer.java:505)      Caused by: javax.persistence.PersistenceException: org.hibernate.TransactionException: JDBC begin transaction failed:           at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387)          at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310)                at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:1397)          at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:62)          at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:71)          at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:60)          at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:378)          ... 11 more      Caused by: org.hibernate.TransactionException: JDBC begin transaction failed:           at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:76)          at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)                at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1426)          at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:59)          ... 14 more      Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure            The last packet successfully received from the server was 1,836,166 milliseconds ago.      The last packet sent successfully to the server was 29,134 milliseconds ago.          at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)          at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)          at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)          at java.lang.reflect.Constructor.newInstance(Constructor.java:526)          at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)          at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)          at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3567)          at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3456)                at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3997)          at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)          at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)          at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2713)          at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:5060)          at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:881)          at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:72)                ... 17 more      Caused by: java.net.SocketException: Software caused connection abort: recv failed          at java.net.SocketInputStream.socketRead0(Native Method)          at java.net.SocketInputStream.read(SocketInputStream.java:150)          at java.net.SocketInputStream.read(SocketInputStream.java:121)          at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:114)          at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:161)          at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:189)          at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3014)          at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3467)          ... 25 more

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