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UnknownUnwrapTypeException: Cannot unwrap to requested type [javax.sql.DataSource]

 
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I know that this question has been answered before, but none of the responses seem to help me, since i am not using a datasource in my project.
I a have a Maven project, integrated with Spring and Hibernate, connecting to a SQL Server 2014 database.
This is my pom.xml, where you can see the versions:



This is hibernate.cfg.xml:



And the class where i create the session factory:



I use Tomcat 8. Whenever i run it, i get UnknownUnwrapTypeException: Cannot unwrap to requested type [javax.sql.DataSource]
I have tried adding the details for the c3p0 connection pool as i have seen in an earlier post and i don't get the error anymore, but the server doesn't start up either, just hangs there after creating the pool.
Can someone, please, help with that?
 
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UPDATE

Well, i have figured it out. Seems like, instead of my current sessionFactory creation, I should have had something like:




Which means i externalized the properties from hibernate.cfg.xml like that:



Which is pretty ok for me, I am not really into xml configurations. But i still don't understand why i cannot import the properties from hibernate.cfg.xml. It should be a way of loading them, even though this kind of configuration isn't the newest or the most up to date.
 
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