I get the following error when I am trying to create a transactionManager bean.

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [spring-config.xml]: Invocation of init method failed; nested exception is org.hibernate.service.UnknownUnwrapTypeException: Cannot unwrap to requested type [javax.sql.DataSource]

I've already posted all my code to stackoverflow.com but I get no answer so far.
You can find all the relevant code here :

http://stackoverflow.com/questions/16179467/error-when-trying-to-create-transactionmanager-bean-in-a-spring-hibernate-appl

Thank you.