The struts2 document says:

[The tag will pre-select multiple values if the values are passed as
an Array or a Collection(of appropriate types) via the value
attribute]
see:
http://struts.apache.org/2.2.1/docs/updownselect.html

So maybe you need define the property in your action as an Array.
Before your save it to DB, you need convert the array into a comma
separated String,
and also, when you load data from DB, you need convert the comma
separated String into an array

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