Um eine Checkbox pro Zeile (und ggf. eine um alle zu markieren) muss man folgendes definieren:

<display:table name="USER_LIST" id="currentUser" class="display" requestURI="/admin/listUser.do" pagesize="8">
	<display:column style="width: 20px;" title="<input type='checkbox' name='selectall' />" >
		<input type="checkbox" name="selectUser" value="<%=((THE-ENTITY)currentUser).getUserId()%>" />
	</display:column>
	<display:column property="userlogin" title="User login" sortable="true" href="editUser.do" paramId="userid" paramProperty="userId" />
	<display:column property="fullname" title="Full name" sortable="true" href="editUser.do" paramId="userid" paramProperty="userId" />
	<display:column property="email" title="eMail" sortable="true" autolink="true" />
	<display:column property="active" title="Active" sortable="true"  href="switchActiveFlag.do" paramId="userid" paramProperty="userId"/>
</display:table>