MyEclipse程序出现500的错误，可能是缺少包，但是不懂，求解，下面是错误提示
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection
org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:379)
org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:350)
org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:261)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:101)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
$Proxy21.login(Unknown Source)
com.sanqing.action.LoginAction.execute(LoginAction.java:26)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
Cannot Open Connection，你需要看看你的Hibernate连接数据库的配置文件是否配置正确，现在的提示信息说明，你连接数据库的Hibernate.cfg.xml配置文件可能有问题。你需要仔细检查下。
Hibernate在创建JDBC事务时候失败，原因是无法创建连接，检查Hibernate.cfg.xml文件的数据库配置情况
