JSF page jumps to a new page after using the ajax filter method and fails to bind the current object - jsf

Question

When I don't use filter from the search area.
After I clicked zoom icon. It runs as normal.
But when I use filter from the search area.
Search area of customer details always returns first data of datatable
This is part of my codes related to search area of customer list
licenseholder.xhtml
<p:commandButton process="#this"
title="Details"
icon="fa button-icon-color icon-search"
action="#{licenseHolderAdmin.doShowDetails()}">
<f:setPropertyActionListener value="#{serviceCustomer}" target="#{licenseHolderAdmin.holderCurrent}" />
<f:setPropertyActionListener value="0" target="#{licenseHolderAdmin.activeTab}" />
</p:commandButton>
LicenseholderAdmin.java
public String doShowDetails() {
if (updateCurrentHolder) {
this.getHolderCurrent();
}
setSelectedLicenses(new ArrayList<License>());
return "licenseholderdetails";
}
public LicenseHolder getHolderCurrent() {
if (updateCurrentHolder) {
if (holderCurrent != null
&& holderCurrent.getCustomerId() != null) {
holderCurrent = customerDao.update(holderCurrent);
}
updateCurrentHolder = false;
}
return holderCurrent;
}
CustomerDao.java
#Override
public LicenseHolder findById(long id) {
try {
Query query = em.createQuery("select distinct lh from LicenseHolder lh where customerId = :id");
Integer intId = (int) id;
query.setParameter("id", intId);
return (LicenseHolder) query.getSingleResult();
} catch (Exception e) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Datensatz konnte nicht gefunden werden.", "ID=" + id));
LOGGER.error("Error while retrieving single customer.");
return null;
}
}
public LicenseHolder update(LicenseHolder customer) {
return findById(customer.getCustomerId());
}
This is part of my codes related to Search area of customer details
licenseholder-details.xhtml
<p:selectOneMenu class="dropdown" value="#{licenseHolderAdmin.holderCurrent}" converter="licenseHolderConverter" >
<f:selectItems value="#{licenseHolderAdmin.getServiceCustomers()}" var="customer"
itemLabel="#{customer.company} (#{customer.customberNumber})" itemValue="#{customer}" />
<p:ajax event="change" oncomplete="switchToCustomer()" process="#form" />
</p:selectOneMenu>
LicenseHolderAdmin.java
public List<LicenseHolder> getServiceCustomers() {
return getHolders();
}
public List<LicenseHolder> getHolders() {
if (holders == null || updateHolderList) {
holders = customerDao.getAllCustomers();
updateHolderList = false;
}
return holders;
}
CustomerDao.java
public List<LicenseHolder> getAllCustomers() {
List<LicenseHolder> holders = null;
try {
Query query = em.createQuery("select distinct lh from LicenseHolder lh order by COMPANY");
holders = query.getResultList();
} catch (Exception e) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_ERROR, "Datensätze konnte nicht geladen werden.", ""));
LOGGER.error("Error while retrieving all customers.");
}
return holders;
}
I have tried f:selectItems to set itemValue="#{customer.customberNumber}". Result doesn't change.
I have also tried f:selectItems to set value="#{licenseHolderAdmin.getHolder(Long id). But I will lost function of query of dropdown. For example.
I am unfamiliar with JSF. Any advice will be grateful!