Chinese keep to themselves everywhere they go, i know many who been here 40 years and don't speak any English, but like igor said it's not a matter of integration, but culture.
sure but not everyone is like the chinese some people are going to need more of a push. especially when the benefits program is generous enough that they dont need to work, learn the language etc to survive.
if their current culture is not compatible with a new society then they need to change it until it is.
when they in turn expect europe to change to suite them and, shockingly, europe has politicians despicable enough to indulge that you are going to see a lot of angry folks