permissions based on roles

hello.

I will start a project and I want to use the gwt toolkit because I
need my application to look like a desktop app.

My concern is regarding the users and roles... and all the permissions
stuffs.

Where can I find an example of this? Or is it not posible to achieve
with gwt and need to integrate gwt into another framework, i.e Spring
or Struts?

Example:

User1 belongs to Role1 and can see x, y, z menus
User2 belongs to Role2 and can see only x menu.

Etc.

Thanks in advance

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