I think I have spent at least 5 hours to get a selectManyCheckbox working properly in JSF. I was getting validation errors and other trouble.
However I have found a great source of information. Also, on some other websites you can read that you should use an array instead of a List for the getter/setter of the backing bean.
Maybe this helps…
RichFaces: rich:modalPanel with rich:componentControl doesn’t show data
Selecting for write in a Java Selector
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