selection orderingList not getting

[abcd1]

hii everybody

i have an orderingList. but when i select the list. i am not getting the selected items in the backend

my .xhtml code is

<rich:orderingList id="ol" value="#{componentBean.componentList}" var="row" selection="#{componentBean.selection}" >
.......
</rich:orderingList>

<a4j:commandButton value="reRender" ></a4j:commandButton>

and my backend code is

public void setSelection(Collection selection) {
 System.out.println("set selection " + selection);
 this.selection = selection;
}
public Collection getSelection() {
 System.out.println("inside getselection "+ selection);
 return selection;
}

i dont know whether this is correct or not. now i am doing like this. when i click on the command button i should get the selected list.

please help me
thanks in advance
cheers

[ilya_shaikovsky]

check please from server log if there conversion/validation problems.