The code I have works perfectly fine as a servlet, but fails as a portlet. Looking into the styles.css, vaadinBootsrap.js etc. with firebug. They look really weird:
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I suppose it is related to
https://www.liferay.com/de/community/forums/-/message_boards/message/56507472
and
https://dev.vaadin.com/ticket/18494
I just saved the vaadinBootstrap.js, but I was not able to uncompress it with gzip -d. So maybe it is not a compression probelm after all.
Does anybody experience similar problems?
Update: Just realized, that I have another portlet, that is already running vaadin 7.5.1. Downgrading did not solve the problem. Both of them are self-contained.
Update 2: Downgrading to vaadin 7.4.8 did solve the problem. But it would be nice to have the newest grid features at some point.