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I've just installed Vaadin to try it so I created a new Vaadin 7 project using Eclipse but I got some importation errors from the very beginning ! Is it a common problem ? Any solution?
If you haven't done it already, make sure you refresh Ivy (right-click the project -> ivy -> refresh). Ivy is your mechanism that installs your libraries for you. It may take a while to download all your libraries, but you should see its progress as it is downloading. Also, make sure you build your widgetset and theme before you run the project.
Thanks for you help but I want to ask you : is it normal that Ivy takes a long time to download all libraries and dependencies ?
It should only be a couple of minutes. It downloads all the libraries used in the Ivy.xml file of the project.
I could clear the cache then resolve and it would only take about 5 minutes or less to download all the libraries. That includes several addons and several other .jars for my server side.