After adding LazyDataModel Editing and Delete not working

Question

I didn't found a good answer so this problem. Maybe I just need to understand how to handle it. I implemented via contextMenu a menuItem to delete selected rows. That doesn't work anymore. Furthermore the editing does not working anymore. I have implemented a row editor. When I click on it, it gets activated and i can start editing but when I press okay or abort nothing happens.

No method is getting called. Not for deleting, not for editing, not even for selecting. It has obviously something to do with the lazyDataModel but how can I change it.

My Controller:

@Scope(value = "session")
@Component(value = "telefonbuchList")
@ELBeanName(value = "telefonbuchList")
@Join(path = "/", to = "/eintraege-liste.jsf")
public class TelefonbuchListController extends LazyDataModel<Telefonbuch> {

    private static final long serialVersionUID = 1L;
    @Autowired
    private TelefonbuchRepository telefonbuchRepository;
    private List<Telefonbuch> selectedEntries;

    private LazyDataModel<Telefonbuch> lazyModel;

    private int pageSize = 5;

    public void deleteEntry() {
        telefonbuchRepository.deleteAll(selectedEntries);
        lazyModel.getWrappedData().removeAll(selectedEntries);
        selectedEntries.clear();
    }

    public LazyDataModel<Telefonbuch> getLazyModel() {
        return lazyModel;
    }

    @Override
    public int getPageSize() {
        return pageSize;
    }

    @Override
    public Telefonbuch getRowData(String rowKey) {
        List<Telefonbuch> list = getWrappedData();

        for (Telefonbuch telefonbuch : list) {
            if (telefonbuch.getId().toString().equals(rowKey)) {
                return telefonbuch;
            }
        }

        return null;
    }

    @Override
    public Object getRowKey(Telefonbuch telefonbuch) {
        return telefonbuch != null ? telefonbuch.getId() : null;
    }

    public List<Telefonbuch> getSelectedEntries() {
        return selectedEntries;
    }

    @Deferred
    @RequestAction
    @IgnorePostback
    public void loadData() {
        lazyModel = new LazyDataModel<Telefonbuch>() {

            private static final long serialVersionUID = 1L;

            @Override
            public List<Telefonbuch> load(int first, int pageSize, String sortField, SortOrder sortOrder,
                    Map<String, Object> filters) {

                List<Telefonbuch> result = new ArrayList<Telefonbuch>();

                if (first == 0) {
                    if (sortField != null && !sortField.isEmpty()) {
                        if (sortOrder.name().equalsIgnoreCase("ascending")) {
                            result = telefonbuchRepository
                                    .findAll(PageRequest.of(first, pageSize, Sort.by(sortField).ascending()))
                                    .getContent();
                        } else if (sortOrder.name().equalsIgnoreCase("descending")) {
                            result = telefonbuchRepository
                                    .findAll(PageRequest.of(first, pageSize, Sort.by(sortField).descending()))
                                    .getContent();
                        }

                    } else {
                        result = telefonbuchRepository.findAll(PageRequest.of(first, pageSize)).getContent();
                    }
                } else {
                    first = first / pageSize;
                    if (sortField != null && !sortField.isEmpty()) {
                        if (sortOrder.name().equalsIgnoreCase("ascending")) {
                            result = telefonbuchRepository
                                    .findAll(PageRequest.of(first, pageSize, Sort.by(sortField).ascending()))
                                    .getContent();
                        } else if (sortOrder.name().equalsIgnoreCase("descending")) {
                            result = telefonbuchRepository
                                    .findAll(PageRequest.of(first, pageSize, Sort.by(sortField).descending()))
                                    .getContent();
                        }
                    } else {
                        result = telefonbuchRepository.findAll(PageRequest.of(first, pageSize)).getContent();
                    }
                }

                return result;
            }
        };

        lazyModel.setRowCount((int) telefonbuchRepository.count()); 
        lazyModel.setPageSize(pageSize);
    }

    public void onCellEdit(CellEditEvent event) {
        Object oldValue = event.getOldValue();
        Object newValue = event.getNewValue();
        telefonbuchRepository.save((Telefonbuch) newValue);
    }

    public void onRowCancel(RowEditEvent event) {

    }

    public void onRowEdit(RowEditEvent event) {
        Object oldValue = event.getObject();
        telefonbuchRepository.save((Telefonbuch) oldValue);
        FacesMessage msg = new FacesMessage("Eintrag geändert",
                ((Telefonbuch) event.getObject()).getVorname() + " " + ((Telefonbuch) event.getObject()).getNachname());
        FacesContext.getCurrentInstance().addMessage("eintraege-list", msg);
    }

    @Override
    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public void setSelectedEntries(List<Telefonbuch> selectedEntries) {
        this.selectedEntries = selectedEntries;
    }

The .xhtml:

<h:form id="eintraegeList">
        <p:panel header="Liste aller Einträge">

            <p:dataTable id="table" var="telefonbuch" lazy="true" widgetVar="tableWv" value="#{telefonbuchList.lazyModel}" stickyHeader="true" editable="true" resizableColumns="true" liveResize="true" style="margin-bottom:20px" paginator="true" rows="#{telefonbuchList.pageSize}" dynamic="true" emptyMessage="Keine Telefonbucheinträge vorhanden" selection="#{telefonbuchList.selectedEntries}" selectionMode="multiple" rowKey="#{telefonbuch.id}"
            currentPageReportTemplate="{startRecord}-{endRecord} von {totalRecords}"
            paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink} {Exporters}"
            rowsPerPageTemplate="5,8,10">
            <f:facet name="header">
                <p:commandButton id="toggler" type="button" value="Anzeige" style="float:right" icon="pi pi-align-justify" />
                <p:columnToggler datasource="table" trigger="toggler" />    
            </f:facet>

            <p:ajax event="rowEdit" listener="#{telefonbuchList.onRowEdit}" update="table" />
            <p:ajax event="rowEditCancel" listener="#{telefonbuchList.onRowCancel}" update="table" />
            <p:ajax event="cellEdit" listener="#{telefonbuchList.onCellEdit}" update="table" />

            <p:separator />

                <p:column headerText="ID" sortBy="#{telefonbuch.id}">
                    <h:outputText value="#{telefonbuch.id}" />
                </p:column>
                <p:column headerText="Vorname" sortBy="#{telefonbuch.vorname}">
                    <p:cellEditor>
                        <f:facet name="output"><h:outputText value="#{telefonbuch.vorname}" /></f:facet>
                        <f:facet name="input"><p:inputText id="vornameInput" value="#{telefonbuch.vorname}" style="width:100%"/></f:facet>
                    </p:cellEditor>
                </p:column>
                <p:column headerText="Nachname" sortBy="#{telefonbuch.nachname}">
                    <p:cellEditor>
                        <f:facet name="output"><h:outputText value="#{telefonbuch.nachname}" /></f:facet>
                        <f:facet name="input"><p:inputText id="nachnameInput" value="#{telefonbuch.nachname}" style="width:100%"/></f:facet>
                    </p:cellEditor>
                </p:column>
                <p:column headerText="Telefonnummer" sortBy="#{telefonbuch.telefonnummer}">
                    <p:cellEditor>
                        <f:facet name="output"><h:outputText value="#{telefonbuch.telefonnummer}" /></f:facet>
                        <f:facet name="input"><p:inputText id="telefonnummerInput" value="#{telefonbuch.telefonnummer}" style="width:100%"/></f:facet>
                    </p:cellEditor>
                </p:column>
                 <p:column headerText="Handynummer" sortBy="#{telefonbuch.handynummer}">
                    <p:cellEditor>
                        <f:facet name="output"><h:outputText value="#{telefonbuch.handynummer}" /></f:facet>
                        <f:facet name="input"><p:inputText id="handynummerInput" value="#{telefonbuch.handynummer}" style="width:100%"/></f:facet>
                    </p:cellEditor>
                </p:column>
                 <p:column headerText="Geschäftsstelle" sortBy="#{telefonbuch.geschaeftsstelle}">
                    <p:cellEditor>
                        <f:facet name="output"><h:outputText value="#{telefonbuch.geschaeftsstelle}" /></f:facet>
                        <f:facet name="input">
                            <p:selectOneMenu value="#{telefonbuch.geschaeftsstelle}" style="width:100%">
                                <f:selectItems value="#{telefonbuchController.geschaeftsstellen}" var="c" itemLabel="#{geschaeftsstelle}" itemValue="#{geschaeftsstelle}"/>
                            </p:selectOneMenu>
                        </f:facet>
                    </p:cellEditor>
                </p:column>
                <p:column headerText="Geschlecht" sortBy="#{telefonbuch.gender.shortGender}">
                    <p:cellEditor>
                        <f:facet name="output"><h:outputText value="#{telefonbuch.gender.shortGender}" /></f:facet>
                        <f:facet name="input">
                            <p:selectOneMenu id="gender" value="#{telefonbuch.gender}" style="width:100%">
                                <f:selectItem itemLabel="Keine Angabe" itemValue="" />
                                <f:selectItems value="#{telefonbuch.genders}" var="gender" itemLabel="#{gender.shortGender}" itemValue="#{gender}"/>
                            </p:selectOneMenu>
                        </f:facet>
                    </p:cellEditor>
                </p:column>
                <p:column style="width:20px;text-align:center;">
                    <p:rowEditor />
                </p:column>
            </p:dataTable>

            <p:growl id="growl" showDetail="true" for="eintraege-list">
                <p:autoUpdate />
            </p:growl> 

            <p:separator />

            <p:contextMenu for="table">
            <h:outputStylesheet library="webjars" name="font-awesome/5.7.1/css/fontawesome.min-jsf.css" />
                <p:menuitem value="Löschen" update="table" icon="fas fa-eraser" action="#{telefonbuchList.deleteEntry}"/>
                <p:menuitem value="Edit Cell" icon="pi pi-search" onclick="PF('tableWv').showCellEditor();return false;"/>  
            </p:contextMenu>

            <h3>Exportieren der Daten</h3>
            <h:commandLink>
                <p:graphicImage value="/img/icon-pdf.png" />
                <p:dataExporter type="pdf" target="table" fileName="Telefonbuch" />
            </h:commandLink>
        </p:panel>
    </h:form>

Model (Telefonbuch):

public enum Gender {
        MALE("Männlich"), FEMALE("Weiblich");

        private String shortGender;

        private Gender(String shortGender) {
            this.shortGender = shortGender;
        }

        public String getShortGender() {
            return shortGender;
        }
    }

    @Column
    @Enumerated(EnumType.STRING)
    private Gender gender;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @Column
    private String vorname;

    @Column
    private String nachname;

    @Column
    private String telefonnummer;

    @Column
    private String handynummer;

    @Column
    private String geschaeftsstelle;

PrimeFaces Version 6.2

JSF MyFaces Version 2.2.12

Java 1.8

Spring Boot 2.1.2