h:selectManyListbox creating problem in Navigation.

Question

Hi ALL,
I m getting 2 problems while working with selectManyListbox in JSF.
First Problem:
My requirement is to transfer values from one List box(ie selectManyListbox) to another, while doing so I m calling the same page in the navigation, but while navigating I m not able to maintain old values of selectItem( ie every time it is initializing � refer java code)
My jsp code is as follows:
<f:view>
<h:form id="frm">
<h:panelGrid columns="3" border="1">
<h:panelGroup>
<h:selectManyListbox id="from" Value="#{up.fromValues} " rendered="#{up.fromFlag} " >
<f:selectItems value="#{up.fromList} " />
</h:selectManyListbox>
</h:panelGroup>
<h:panelGroup>
<h:panelGrid columns="4" border="1">
<h:commandButton value="Left" action="#{up.removeOne} " />
<h:commandButton value="LeftAll" action="#{up.removeAll} " />
<h:commandButton value="RightAll" action="#{up.moveAll} " />
<h:commandButton value="Right" action="#{up.addOne} " />
</h:panelGrid>
</h:panelGroup>
<h:panelGroup>
<h:selectManyListbox id="to" value="#{up.toValues} " rendered="#{up.toFlag} " >
<f:selectItems value="#{up.toList} " />
</h:selectManyListbox>
</h:panelGroup>
</h:panelGrid>
</h:form>
</f:view>
And Java code is :
//fromList � First List from which transferring to 2nd list
//toList � To list
//fromString �constant string from which adding options to select box
private List<SelectItem> fromList;
private List<SelectItem> toList;
String[] fromValues;
String[] toValues;
String[] fromString = { "1111", "2222", "3333", "4444" };
String[] toString = {"aaaa","bbbb" };
public List<SelectItem> getFromList( ) {
if (fromList == null) {
fromList = new ArrayList<SelectItem>();
for (int i = 0; i < fromString.length; i++) {
SelectItem item = new SelectItem() ;
item.setValue( fromString[ i]);
item.setLabel( fromString[ i]);
fromList.add( item);
return fromList;
In the above code initially I m checking for fromList == null, 1st time this condition will be true, but when I call 2ed time ie values are put into fromList, so this condition should become false, but every time this condition is becoming true and initializing fromList all the time.
Can anyone please tell me where am I going wrong??
And code to transfer one option from one select box to another is as follows:
public String addOne() { //This will be called when �Right� button is clicked
for (int i = 0; i < fromValues.length; i++) {
SelectItem item = new SelectItem() ;
item.setValue( fromValues[ i]);
item.setLabel( fromValues[ i]);
toList.add(item) ;
for (int j = 0; j < fromList.size( ); j++) {
SelectItem it = (SelectItem) fromList.get( j);
// it.setValue( fromList. get(j));
if (fromValues[ i].equals( it.getValue( ))) {
fromList.remove( j);
return "addOne";
Second Problem :
In jsp page as I m using 2 selectManyListbox, until I select one option from both the select boxes, I m not able to submit the form on clicking on commandButton.
For eg: if I want to transfer �aaa� from first select box ie box1 ={aaa,bbb,ccc} to box2 ={xxx,yyy} , if I select only �aaa� and click on �Right�(commandButton ), it is not submitting the request. IF I select �aaa� and any one of box2 option ( xxx or yyy) and press �Right� then I m able to pass request(ie able to submit the form).
But I want to submit by selecting only one option from select box (ie box1)
Can anyone guide me???
Thanks in advance�.

Answer 1

First Problem solution:
Here i did a silly mistake in faces config...ie mananged bean scope I had given was request..so in the next request i was loosing old values...
"I changed the scope to session"
Second Problem :
in commandButton i used another additional attribute ie immidiate = true..
tht's all................