Each row of your datatable (and so group of checkboxes) refers to the same backing list so will overwrite it.
As for grouping, no, currently there is no easy way to use groups with s:selectItems (actually there is no easy way to use grouping with JSF at all that I can see). I filed a feature request, and I'll try to implement it soon.
In the meantime, your best bet is to return selectitemsgroups using f:selectItems (old-style JSF).
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Everything that I have seen so far says that it should work. The only thing I can suggest is try it on another machine, and if that works try to figure out what is different between the two machines.
I am getting all of the same responses (though in English not German) and seeing the same JBoss AS output. And it works for me. There has to be something about your PC that is different than mine, but I have run out of ideas.
One last idea, start the server using the -b 0.0.0.0 option and see if you connect then.
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