jdbc启动错误（The driver has not received any packets from the server）

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.     at sun.reflect.GeneratedConstructorAccessor15.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:407)     at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)     at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:690)     at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1093)     at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2338)     at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2371)     at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2163)     at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)     at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)     at sun.reflect.GeneratedConstructorAccessor16.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:407)     at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:378)     at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)     at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135)     at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)     at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)     at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)     at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)     at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)     at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)     at com.mchange.v2.async.ThreadPerTaskAsynchronousRunner$TaskThread.run(ThreadPerTaskAsynchronousRunner.java:255) Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.     at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2539)     at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:614)     ... 20 more 2012-04-20 10:17:57,976-[HL] WARN Task-Thread-for-com.mchange.v2.async.ThreadPerTaskAsynchronousRunner@3729f7 com.mchange.v2.resourcepool.BasicResourcePool - com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@1e88181 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception:   com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

　　原因大概就是启动的时候发送了一些测试语句到mysql，但是没有得到响应，估计是连接超时的问题

java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.     at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)     at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)     at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)     at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)     at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)     at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:111)     at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2101)     at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1325)     at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:859)     at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:855)     at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:774)     at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1460)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1398)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:512)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:540)     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:842)     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:416)     at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:261)     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:192)     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)     at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)     at org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)     at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)     at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)     at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)     at org.apache.catalina.core.StandardService.start(StandardService.java:516)     at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)     at org.apache.catalina.startup.Catalina.start(Catalina.java:583)     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.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@192c07a -- timeout at awaitAvailable()     at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)     at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)     at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)     at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)     ... 38 more

　　这个东西以前没有注意到，上网找来了很多的解决方法

最好的如下：

jdbc.url=jdbc:mysql://localhost:3306/totosea?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false

　　在mysql的安装目录下找到my.ini

添加

wait_timeout=31536000 interactive_timeout=31536000