Primefaces reload page on observer method won't work - jsf

Question

I am running
JakartaEE 9.1
Primefaces 12
Glassfish 6.2.5
I have two browser windows open. I fire an event in one window and receive it in the second one.
This works fine, since my business logic is run through. At the end I do a
PrimeFaces.current().ajax().update("form:roomplanerTimeline");
But it is not working. The error is
PrimeFaces.current().ajax().update() called but component cant be resolved! Expression will just be added to the renderIds: {0}
My roomplaner.xhtml frontend look like this
<ui:composition template="/WEB-INF/template/master_timeline.xhtml"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:p="http://primefaces.org/ui"
xmlns:f="http://xmlns.jcp.org/jsf/core">
<ui:define name="content">
<h:form id="form">
<p:growl showSummary="true" showDetail="true"
keepAlive="true" life="5000">
<p:autoUpdate />
</p:growl>
<p:panel>
<p:card class="rommplaner_nav" >
<p:panelGrid id="courseSelection"
columns="2"
...
<p:dataList id="examsList"
value="#{roomController.exams}"
var="exam"
class="exam-card"
emptyMessage="Es sind keine zu verplanenden Prüfungen vorhanden.">
<p:outputPanel id="pnl" class="exam-panel pendingExamItem #{exam.courseNameTrimmed}">
#{exam.moduleShort} (#{exam.registrationCount})
<h:outputText styleClass="pi pi-info-circle" rendered="#{not empty exam.note}"/>
</p:outputPanel>
<p:tooltip for="pnl" position="bottom" hideEvent="mousedown click mouseleave">
<i class="pi pi-credit-card"/><h:outputText value=" #{exam.moduleName}" />
<br />
<i class="pi pi-building"/><h:outputText value=" #{exam.courseName}" />
<br />
<h:outputText styleClass="pi pi-info-circle" rendered="#{not empty exam.note}"/>
<h:outputText value=" #{exam.note}" rendered="#{not empty exam.note}" />
</p:tooltip>
<p:draggable for="pnl" revert="true" appendTo="#(body)" zindex="5" />
</p:dataList>
</p:card>
</p:panel>
<p:panel >
<p:card class="rommplaner_nav" >
<p:timeline id="roomplanerTimeline"
value="#{roomController.model}"
extender="timelineExtender"
var="exam"
varGroup="room"
widgetVar="roomplan"
start="#{roomController.startDay}"
end="#{roomController.endDay}"
min="#{roomController.startTimeline}"
max="#{roomController.endTimeline}"
zoomKey="altKey"
zoomMin="#{roomController.zoomMin}"
zoomMax="#{roomController.zoomMax}"
zoomable="true"
moveable="true"
showMajorLabels="true"
showMinorLabels="true"
stackEvents="true"
orientationAxis="both"
snap="#{'snapTimeline'}"
responsive="true"
showCurrentTime="false"
>
...
The Observer method in the corresponding bean
import jakarta.enterprise.event.Observes;
...
#Named(value = "roomController")
#SessionScoped
public class RoomController implements Serializable {
public void observeEvent(#Observes Pruefplaneintrag movedEvent){
TimelineUpdater timelineUpdater = TimelineUpdater.getCurrentInstance(this.frontendIdTimeline);
LocalDate timestamp = movedEvent.getPPEDatZeit().toLocalDate();
if(timestamp.equals(this.currentPeriodDate)) {
System.out.println("Move Event is on same date -> Action");
// Update timeline
List<TimelineEvent<TimelineItem>> allEvents = model.getEvents();
int i =0;
while(i < allEvents.size()) {
TimelineEvent<TimelineItem> event = allEvents.get(i);
TimelineItem item = event.getData();
if(item.getExamID() == movedEvent.getPpid()) {
System.out.println("Found Event");
event.setStartDate(movedEvent.getPPEDatZeit());
event.setEndDate(event.getStartDate().plusMinutes(item.getDuration()));
model.delete(event);
model.add(event);
model.update(event, timelineUpdater);
this.reloadPage();
break;
}
i++;
}
}
}
And the reload method
private void reloadPage() {
PrimeFaces.current().executeScript("window.location.reload(window.location.href)");
PrimeFaces.current().ajax().update(this.frontendIdCourseSelection);
PrimeFaces.current().ajax().update(this.frontendIdExamslist);
PrimeFaces.current().ajax().update(this.frontendIdTimeline);
//PrimeFaces.current().ajax().update("#all");
System.out.println(FacesContext.getCurrentInstance().getPartialViewContext().getRenderIds());
//FacesContext.getCurrentInstance().getPartialViewContext().getRenderIds().
Ajax.update("form:roomplanerTimeline");
/*FacesContext context = FacesContext.getCurrentInstance();
String viewId = context.getViewRoot().getViewId();
ViewHandler handler = context.getApplication().getViewHandler();
UIViewRoot root = handler.createView(context, viewId);
root.setViewId(viewId);
context.setViewRoot(root);*/
}
As you can see I printed out the renderids which are
[messages_left, growl, :form:courseSelection, :form:examsList, form:roomplanerTimeline]
which are present in the xhtml file.
I tried every combination as you can see in the reloadPage method. But nothing works. I have to do a manual refresh via F5 to reload the page and show the changes.
If I do a
ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
ec.redirect(ec.getRequestContextPath()+"/faces/app/roomplaner.xhtml");
The redirect takes place in the fire event window not in the observer window.
This is the console log
Move Event is on same date -> Action|#]
Found Event|#]
PrimeFaces.current().ajax().update() called but component cant be resolved! Expression will just be added to the renderIds: {0}|#]
PrimeFaces.current().ajax().update() called but component cant be resolved! Expression will just be added to the renderIds: {0}|#]
PrimeFaces.current().ajax().update() called but component cant be resolved! Expression will just be added to the renderIds: {0}|#]
[messages_left, growl, :form:courseSelection, :form:examsList, form:roomplanerTimeline]|#]```