Is there a limit on length of EL expression?

[parki]

Hello:

I'm using c:forEach to build up a number of tabs:

<c:forEach items="#{thermostatAdaptor.calendarEvents}" var="ce">
 <rich:tab label="#{ce.name}">
 <h:outputText value="YYY"/>
 </rich:tab>
 </c:forEach>

This works fine - the question I have is really around the EL expression used in the 'items' attribute.

Originally, the 'items' attribute was being set up by:

items="#{thermostatAdaptor.thermostat.program.calendarEvents}"

but this didn't work. So I added a 'getCalendarEvents' method on the thermostatAdaptor, which just dereferences.

public List<CalendarEvent> getCalendarEvents()
{
 return thermostat_.getProgram().getCalendarEvents();
}

public Thermostat getThermostat()
{
 return thermostat_;
}

My question:

Why doesn't "#{thermostatAdaptor.thermostat.program.calendarEvents}" work?

Iis there a limit to the length, or number of getter calls within an EL expression?

I have a workaround so I'm fine, just wondering.

Many thanks.

[fmarwede]

Try to find such a limitation in the docs but there is nothing like that.

Then I built a little test app and with a depth of 10 it works for example.

Are you really sure, all your getters/setters are built the right way?

[parki]

Thanks fmarwede -

I am an idiot - yah - it was a subtle problem whereby null was able to creep into the dereferencing.

Working now.

Is there a way to declare a temporary variable to reduce the size of the chains? Something like:

<x:def value="#{thermostatAdaptor.thermostat.program.calendarEvents}" var="x" />
...
<rich:tab label="#{x.name}">

Thanks again.

parki...

[mgrouch]

"parki" wrote:


Is there a way to declare a temporary variable to reduce the size of the chains? Something like:

<x:def value="#{thermostatAdaptor.thermostat.program.calendarEvents}" var="x" />
...
<rich:tab label="#{x.name}">

There is a JIRA open for it. Give it your vote

http://jira.jboss.com/jira/browse/GRAVEL-27