Sample vaadin application that uses shiro as security provide. 

Maven
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- install maven 3
- execute command: mvn clean install
 
Tomcat
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- install Tomcat 7
- deploy war
- open in web browser the url http://localhost:8080/vaadin-shiro-simple/
- Login with one of the following users: 
  * admin with password admin, 
  * demo with password demo, 
  * view with password view

Eclipse
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I used Helios Eclipse IDE for Java EE Developers
Recommended plugins:
- m2e
- m2e-extras (WTP plugin required only)
- Vaadin eclipse plugin

You can import the project via Maven->Existing Maven Projects.
Execute following operations:
- Maven->Update Dependencies
- Maven->Update Project Configuration
- RunAs->Maven Install
- Project->Clean
- Run As->Run on Server