how to submit a collection via ww:select ?

<ww:select label="available" name="allroles" list="#SysInfo.sysroledefs" listKey="roleid" listValue="rolename" size="3"
	ondblclick="addto(roles,this,this.selectedIndex)"/>
	<ww:select label="assigned" name="roles" list="roles" size="3"/>
sysroledefs is a collection,my purpose is to assign values from sysroledefs to roles(muitiple roles can be assigned),so I hope roles should be a list as well.In my action,it's defined like this:
private HashMap<Character,String>  roles;
But in fact,after I submit this page,property roles is null.
so,How to do?
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