java - commit() 期间通信链接失败。交易决议未知

Question

大家好，我们开发了一个 J2EE 应用程序，它可以执行存储过程以从数据库中获取数据。 以前在我们将 MySql 版本升级到 5.5 到 5.6 之前它工作正常 现在我收到 Communications link failure during commit() 我也不确定这个错误是否是由于 mysql 升级引起的。我已经花了一周的时间来解决这个问题。

注意: 此外，当我重新启动我的应用程序和 mysql 时，它会正常工作一段时间，然后开始出现以下异常。

我们使用的框架

Spring 3.0.1
Hibernate 3.3

刚刚升级的东西

C3P0 (Previous Version 9.1.2)
c3p0-0.9.5-pre8.jar 
c3p0-oracle-thin-extras-0.9.5-pre8.jar
mchange-commons-java-0.2.7.jar
Connector/J (Previous Version 5.1.7)
mysql-connector-java-5.1.30-bin.jar

C3P0 配置

initialPoolSize=10
maxPoolSize=30
minPoolSize=5
acquireIncrement=3
acquireRetryAttempts=0
preferredTestQuery=SELECT 1
idleConnectionTestPeriod=600
numHelperThreads=10
testConnectionOnCheckout=true
maxIdleTime=300

JDBC 属性

DriverClassName=com.mysql.jdbc.Driver
Url=jdbc:mysql://localhost:3306/mydatabase?useOldAliasMetadataBehavior=true&autoReconnect=true
Username=root
Password=

错误信息

ERROR org.hibernate.transaction.JDBCTransaction#toggleAutoCommit  - Could not toggle autocommit
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Last packet sent to the server was 0 ms ago.
        at sun.reflect.GeneratedConstructorAccessor56.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3009)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2895)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3438)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1951)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2548)
        at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:4916)
        at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:912)
        at org.hibernate.transaction.JDBCTransaction.toggleAutoCommit(JDBCTransaction.java:194)
        at org.hibernate.transaction.JDBCTransaction.commitAndResetAutoCommit(JDBCTransaction.java:142)
        at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:115)
        at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:412)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
        at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:625)
        at com.report.service.servk$$EnhancerByCGLIB$$dd20ff76.l(<generated>)
        at com.report.controller.contbg.c(UserDashboardController.java:296)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doInvokeMethod(HandlerMethodInvoker.java:710)
        at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:167)
        at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:414)
        at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:402)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:771)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:716)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:647)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:552)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.report.filter.SessionFilter.doFilter(SessionFilter.java:69)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.report.filter.GUIDFilter.doFilter(GUIDFilter.java:38)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
        at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2455)
        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2906)

当我执行以下查询以检查与我的数据库的打开连接时

SELECT * FROM INFORMATION_SCHEMA.PROCESSLIST WHERE DB = "mydatabase";

它显示了我的应用程序执行的所有查询，如下所示

| ID  | USER     | HOST            | DB         | COMMAND | TIME | STATE               |INFO                      | TIME_MS | ROWS_SENT | ROWS_EXAMINED |
| 881 | root     | %:59283         | mydatabase | Query   | 1483 | Creating sort index | MY Query in Stored Procedure | 1482838 |         0 |             0 |
...
20 rows in set (0.42 sec)

我去了以下链接，但仍然无法获得解决方案

Automatic reconnect from Hibernate to MySQL

Stack link

任何人都可以帮助解决这个问题或任何有用的链接或调试步骤将不胜感激

提前致谢...

Answer 1

网络不稳定

重现代码: 征服查询() sleep(10)//当 sleep 关闭你的网络 conn.roolback()