Primefaces selectManyMenu-> loading default values - jsf-2

Question

im using jsf 2.2 majorra and primefaces 5.1 to build a webapp
i know this has probably been answered before, but i dont find my error... i took examples from the primefaces showcase and tried some stuff suggested by the internet, but it doesnt want to work
<?xml version="1.0" encoding="UTF-8"?>
<ui:composition template="/WEB-INF/template/master.xhtml"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui"
xmlns:pe="http://primefaces.org/ui/extensions"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets">
<ui:define name="content">
<p:selectManyMenu id="userList"
value="#{userAdministrationController.selectedUsers}" var="t"
filter="true" filterMatchMode="contains" showCheckbox="true">
<f:selectItems value="#{userAdministrationController.selectItemList}"
var="user" itemLabel="#{user.fullName}" itemValue="#{user}" />
<p:column>
<h:outputText value="#{t}" />
</p:column>
</p:selectManyMenu>
<p:separator />
<p:commandButton value="Submit" oncomplete="PF('dlg').show()"
icon="ui-icon-check" />
</ui:define>
</ui:composition>
im trying to load this list so that some users are already selected when visiting the page, like a default value
all users show as desired, but no default values are loaded to the checkboxes
thanks in advance

Answer 1

okay now i found the answer:
working code->
<p:selectManyMenu id="userList"
value="#{userAdministrationController.selectedUsers}" var="t"
filter="true" filterMatchMode="contains" showCheckbox="true" >
<f:selectItems value="#{userAdministrationController.selectItemList}"
var="user" itemValue="#{user}" />
<p:column>
<h:outputText value="#{t}" />
</p:column>
</p:selectManyMenu>
without the converter! and in my bean i had to make a List for the preselected values, the stuff in the list has to be the same type as the VALUES of the selectitems
List<User> inactiveUsers = userService.findByActive(false);
List<User> userList = userService.findAll();
selectItemList = new ArrayList<SelectItem>();
for (User user : userList) {
SelectItem selectItem = new SelectItem(user.getFullName(), WordUtils.capitalize(user.getFullName()));
selectItemList.add(selectItem);
}
selectedUsers = new ArrayList<String>();
for (User user : inactiveUsers) {
String userName = user.getFullName();
selectedUsers.add(userName);
}