1)  Do the external appenders come and go, or do we know ahead of time if they 
are available?
No, come and go!

2)  Would a RoutingAppender() that knows if external or internal logging is to 
be done and then routes messages to the appropriate appender a solution?

More or less yes.


On 2020/03/25 14:53:08, Doug Wegscheid <dwegsch...@sbcglobal.net> wrote: 
>  ah. a couple of solutions present themself (and hopefully someone more 
> conversant with log4j4 can chime in).
> Would a RoutingAppender() that knows if external or internal logging is to be 
> done and then routes messages to the appropriate appender a solution?
> Do the external appenders come and go, or do we know ahead of time if they 
> are available?
> 
> 
> 
>     On Wednesday, March 25, 2020, 10:41:33 AM EDT, EDMONDO SENA 
> <edse...@gmail.com> wrote:  
>  
>  In order to disable local logging when the external logging is enabled.
> So, remove all local appenders and disable local logging for re-enabling the 
> delivery towards another system to run-time.
> 
> 
> On 2020/03/25 14:29:26, Doug Wegscheid <dwegsch...@sbcglobal.net> wrote: 
> >  upon examination, I see that clearAppenders() is not public, so that won't 
> >work.
> > There is probably a way to do what you want, if you can tell us why you 
> > need to clear the appenders.
> > 
> >    On Wednesday, March 25, 2020, 10:23:38 AM EDT, EDMONDO SENA 
> ><edse...@gmail.com> wrote:  
> >  
> >  
> > Can you explain me how can i do it?
> > 
> > Regards.
> > 
> > 
> > 
> > 
> > On 2020/03/25 14:18:03, Doug Wegscheid <dwegsch...@sbcglobal.net> wrote: 
> > >  you are trying to clear the list of appenderRefs. Are you trying to call 
> > >clearAppenders() instead of clear()?
> > > 
> > >    On Wednesday, March 25, 2020, 10:03:27 AM EDT, EDMONDO SENA 
> > ><edse...@gmail.com> wrote:  
> > >  
> > >  
> > > Why this instruction goes in UnsupportedOperationException?
> > > 
> > > List<AppenderRef> value = loggerConfig.getAppenderRefs();
> > > value.clear();
> > > 
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