获得异常org.springframework.transaction.CannotCreateTransactionException

Question

将spring 4与hibernate 4集成在一起，但是以下是异常。 任何一个想法？

Exception in thread "main" org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Could not open connection