daySlotForResourceKind is null inside the call getDateNotPas

[tony.herstell1]

daySlotForResourceKind is null inside the call getDateNotPassedAlready which afaik is not possible.

Whats going in inside rich:columGroup?

I have had to add a null check in the code to handle this.

<rich:dataTable var="daySlotForResourceKind" value="#{dayForResourceKind.daySlots}">
 <f:facet name="header">
 <rich:columnGroup>
 <rich:column>
 <h:outputText id="allocation_slot" value="#{messages.allocation_slot}" />
 </rich:column>
 <rich:column>
 <h:outputText id="allocation_status" value="#{messages.allocation_status}" />
 </rich:column>
 </rich:columnGroup>
 </f:facet>

 <rich:columnGroup rendered="#{resourceAllocationController.getDateNotPassedAlready(dayForResourceKind, daySlotForResourceKind)}">
 <rich:column breakBefore="true">
 <h:outputText value="#{daySlotForResourceKind.slot.label}"/>
 </rich:column>
 <rich:column>
 <h:outputText value="#{daySlotForResourceKind.title}"/>
 </rich:column>
 </rich:columnGroup>
</rich:dataTable>

[tony.herstell1]

I have been looking into this with the debugger and it seems that
getDateNotPassedAlready()

is called before
getDaySlots()


This makes me think that the rich:columnGroup is being elaborated at least ONCE (three times in my case) BEFORE rich:dataTable.

I know you get this strange kind of stuff happening in JSF (it really makes JSF unresponsive as often routines are called multiple times).

I should actually learn more about JSF so I can no process some things when its not the right phase!

Anyhow, I hope this helps you analyse what is going on with rich:columnGroup (and possibly update the docs if its a problem that you cant get round).

[tony.herstell1]

I have looked at this again and still cant see why it is happening.
I can confirm it is happening however.

[maksimkaszynski]

That's because dataTable processes (decodes, validates, renders, etc.) column headers prior to rows that contain data.

[tony.herstell1]

Thanks for the reply.
Perhaps this is worth a comment in the doco for others like me who are left wondering about all the NPE's
:)