There are not many open source projects using spring, hibernate technologies. And when we start to learn hibernate, spring we want to improve our knowledge about spring and hibernate. But its hard to find open source project about them. That’s why I sorted some projects which using spring and hibernate you may want to check.

BroadleafCommerce

This is an open source eCommerce solution based spring. And using hibernate, jpa, thymleaf ..

Here is the link for it
https://github.com/BroadleafCommerce/BroadleafCommerce

And demo site using BroadleafCommerce

Link for demo project source code:

https://github.com/BroadleafCommerce/DemoSite

And you can see the online demo from here.

ZkSample2

This project using zk framework. And of course spring based.

Here is the link for it:

http://sourceforge.net/projects/zksample2/

AgileExpress

This is an open source agile project management tool based spring.

Here is the link for it:

http://sourceforge.net/projects/agileexpress/

Liferay

https://github.com/liferay/liferay-portal

I suggest you to especially check BroadleafCommerce. It has a really good architecture to learn something from it.