I have been out of side projects for a while and been only working at Java (server side). Hence I have no idea what new technology is out. So to learn new technology + build a pet project I need your suggestion.<p>The project I want to build requires<p>- A neat UI (I like Vaadin but not sure how good it is)
- Cross platform UI compatibility
- Server Side to do transactions, printing on different machines, Roles management etc<p>Thanks.