jdbc 連接遠(yuǎn)程mysql數(shù)據(jù)庫(kù)的問(wèn)題

我使用客戶(hù)端軟件如mysql-front連接遠(yuǎn)程mysql數(shù)據(jù)庫(kù)正常，

但是在項(xiàng)目代碼里使用這個(gè)遠(yuǎn)程數(shù)據(jù)庫(kù)后，tomcat啟動(dòng)時(shí)，update表正常，啟動(dòng)后進(jìn)行操作時(shí)卻報(bào)錯(cuò)了：

13:13:33,517 INFO [org.springframework.jdbc.datasource.JdbcTransactionObjectSupport] JDBC 3.0 Savepoint class is available

13:13:33,861 ERROR [org.hibernate.transaction.JDBCTransaction] JDBC begin failed

com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 17,375 milliseconds ago. The last packet sent successfully to the server was 47 milliseconds ago.

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

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:407)

at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3082)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2968)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3516)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1986)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2140)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2620)

at com.mysql.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:5022)

at com.mchange.v2.c3p0.impl.NewProxyConnection.setAutoCommit(NewProxyConnection.java:881)

at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:87)

at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1473)

at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:555)

at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:371)

at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:335)

at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:105)

at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)

at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)

at $Proxy7.getTeamUserList(Unknown Source)

at com.xx.action.XxAction.findXxList(XxAction.java:51)

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 com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)

at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)

at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)

at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)

at org.apache.tomcat.util.net.JIoEndpoint$socketProcessor.run(JIoEndpoint.java:302)

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:2529)

at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2979)

... 86 more

org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.TransactionException: JDBC begin failed:

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