c:forEach displays one item double and hides another item - primefaces

Question

I have a c:forEach for a list of categories. And a "sub" c:forEach for items of each category. If an item is deleted from the first category, then the first item of the second category will be displayed double, in other words, it will be displayed with the title of the following item. After Debugging, all the categories and their items are correctly populated, but while updating the page, somehow GET method is fired for this item double and for the next item it is not fired at all. If an item is added to the first category, then last item of the second category is displayed double. Does anyone have an idea?
listItemsMainPage.xhtml
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
template="#{viewContextHandler.selectedTemplate}">
<ui:define name="content">
<p:panel>
<h:panelGroup id="sb-itemBrowser-area" layout="block">
<h:form id="sb-itemBrowser-form">
<p:toolbar id="sb-itemBrowser-header">
<p:toolbarGroup align="left">
<h:panelGroup layout="block" style="margin-left: 5px; margin-top: 5px;" >
<h:outputText value="#{msg.itemBrowser}" />
</h:panelGroup>
</p:toolbarGroup>
<p:toolbarGroup align="right">
<p:commandButton id="sb-itemBrowser-refresh-button"
icon="fa fa-refresh"
process="#this"
update="sb-itemBrowser-form"
title="#{msg.refresh}"
action="#{catController.refreshAll()}"/> </p:toolbarGroup>
</p:toolbar>
<ui:include src="/components/categoryViewer.xhtml"/>
<p:blockUI block="sb-itemBrowser-header sb-item-category-viewer" trigger="sb-itemBrowser-refresh-button" />
</h:form>
</h:panelGroup>
<h:panelGroup id="sb-item-config-area" layout="block" styleClass="sb-content-box" style="overflow: hidden;">
<p:panel id="itemDetails" >
<f:facet name="header">
<h:outputText value="#{msgs.item}" />
</f:facet>
<ui:include src="/components/itemDetailsContent.xhtml"/>
</p:panel>
</h:panelGroup>
</p:panel>
</h:panelGroup>
</ui:define>
<ui:define name="dialogs">
<ui:include src="/dialogs/delete.xhtml" />
<ui:include src="/dialogs/upload.xhtml" />
<h:form id="SystemItemViewerForm">
<p:remoteCommand name="checkItemMessages" action="#{notificationController.showItemMessages()}"/>
<ui:include src="/components/systemitem/showSystemItem.xhtml"/>
</h:form>
<ui:include src="/components/systemItemViewer/dialogs/singlesystemitemviewerdialog.xhtml" />
</ui:define>
</ui:composition>
categoryViewer.xhtml
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:p="http://primefaces.org/ui">
<h:panelGroup styleClass="no-padding" layout="block" id="itemCatViewer">
<c:forEach items="#{catController.itemCategoryList}" var="category">
<p:panel id="dynamicid#{category.index}"
toggleable="true"
widgetVar="catpanel#{category.index}"
styleClass="no-padding"
collapsed="#{category.untoggled}"
style="border:none; padding: 0px;">
<p:ajax event="toggle" listener="#{catController.doToggleCategory}" />
<h:panelGroup rendered="#{not empty category.catItems}" style="padding: 0px;">
<c:forEach items="#{category.catItems}" var="catItem">
<h:panelGrid columns="3"
cellspacing="0"
cellpadding="2"
border="0"
style="padding: 0px; #{catItem.disabled ? 'opacity: 0.5;' : ''}"
styleClass="sb-hover-highlight">
<p:commandLink update=":catItemDetails,:deleteCatItemDialogForm:deleteCatItemPopup"
action="#{catItemController.showCatItem}"
process="#this">
<h:outputText rendered="#{! empty catItem.catItemInfo.title}"
value="#{catItem.catItemInfo.title}" />
<h:outputText rendered="#{empty catItem.catItemInfo.title and not empty catItem.catItemInfo.name}"
value="#{catItem.catItemInfo.name}" />
<f:setPropertyActionListener value="#{catItem.name}" target="#{catItemController.catItemName}" />
<f:setPropertyActionListener value="#{catItem.folder}" target="#{catItemController.catItemFolder}" />
</p:commandLink>
</h:panelGrid>
</c:forEach>
</h:panelGroup>
<h:panelGroup layout="block" style="padding: 3px;">
<p:commandButton value="#{msgs.rrm_upload_items}"
icon="sb-btn-icon fa fa-upload"
process="#this"
action="#{itemResourcesController.doPrepareItemUpload}"
update=":modalItemUploadDialog"
oncomplete="PF('dlgUploadItems').show()" >
<f:setPropertyActionListener value="#{category.path}" target="#{itemResourcesController.categorypath}" />
<f:setPropertyActionListener value="#{category.description}" target="#{itemResourcesController.categorydescription}" />
</p:commandButton>
</h:panelGroup>
</p:panel>
</c:forEach>
</h:panelGroup>
</ui:composition>
upload.xhtml
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:c="http://java.sun.com/jsp/jstl/core"
xmlns:p="http://primefaces.org/ui">
<p:dialog id="modalUploadItemDialog" header="#{msgs.rrm_upload_title}" widgetVar="dlgUploadItems" modal="true">
<p:ajax event="close" update=":sb-itembrowser-form:sb-item-category-viewer" listener="#{catItemController.doRefreshItemCategoryViewer}" />
<h:form enctype="multipart/form-data">
<p:fileUpload listener="#{itemResourcesController.handleFileUpload}"
widgetVar="fileuploadComponent"
styleClass="sb-fileupload-big"
mode="advanced"
update=":growl"
process="#form"
multiple="true"
cancelLabel="#{msgs.rrm_upload_break}"
uploadLabel="#{msgs.rrm_upload}"
label="#{msgs.chooseFile}"
sizeLimit="20480000"
invalidFileMessage="Invalid file type."
allowTypes="/(\.|\/)(txt|zip)$/"
sequential="true">
</p:fileUpload>
</h:form>
<script type="text/javascript">
$(document).ready(function()
{
PF('fileuploadComponent').buttonBar.find("button.cancel").bind("click", function(e) {
clearInvalidFileMsg();
});
});
function clearInvalidFileMsg() {
PF('fileuploadComponent').uploadContent.find("tr.ui-state-error").remove();
}
</script>
</p:dialog>
</ui:composition>
CatItemController.java
#ManagedBean(name = "catItemController")
#SessionScoped
public class CatItemController
{
public String doRefreshItemCategoryViewer()
{
list();
catController.refreshAll();
return "";
}
public String list()
{
// calling this method will implicitly update the persistence
// with items from the file system.
this.serviceLocator.getItemManagementBean().syncItemsByCategoryPath();
uploads = null;
this.item= null;
return "listItems";
}
}
CatController.java
#ManagedBean(name = "catController")
#SessionScoped
public class CatController implements Serializable
{
public List<ItemCategory> getItemCategoryList()
{
if (itemCategoryList == null)
{
LOGGER.debug("building global item category list");
itemCategoryList = refreshCategoryList(getItems(), false);
}
return itemCategoryList;
}
private List<ItemCategory> refreshCategoryList(List<Item> items, boolean searchModeActive)
{
List<ItemCategory> currentItemCategoryList = getCategoryList();
for (Item item : items)
{
String itemPath = item.getCategory().getPath();
for (ItemCategory myCat : currentItemCategoryList)
{
String catpath = myCat.getPath().endsWith("/") ? myCat.getPath() : myCat.getPath() + "/";
if (myCat.getItems() == null)
{
myCat.setItems(new ArrayList<Item>());
}
if (catpath.equals(itemPath))
{
ItemInfo itemInfo = otherController.getItemInfo(catpath + item.getName());
if (itemInfo.getTranslatedTitle().toLowerCase().contains(searchString.toLowerCase()))
{
List<ItemFile> itemList = (List<ItemFile>) myCat.getItems();
itemList.add(new ItemFile(item, itemInfo));
ItemFile.setSortMode(ItemFile.SORT_ASC);
Collections.sort(itemList);
int visibleitems = 0;
for (ItemFile vif : itemList)
{
if (vif.isVisible())
{
visibleitems++;
}
}
myCat.setItems(itemList);
myCat.setVisibleitems(visibleitems);
}
}
}
}
if(!CollectionUtils.isEmpty(toogledCategories))
{
for(ItemCategory cat:currentItemCategoryList)
{
if(toogledCategories.contains(cat.getPath()))
{
cat.setToggled(true);
}
}
}
return currentItemCategoryList;
}
}