> > java.lang.NullPointerException
> >    at
> > hudson.model.AbstractDescribableImpl.getDescriptor(AbstractDescribable
> > Impl.java:35)
> 
> Jenkins.getInstance() is null. Perhaps Jenkins is shutting down?

Hmmm....  I did update a couple of plugins and hit "restart when no jobs are 
running"  but this job was running then so it shouldn't have shutdown until 
after the job finished.

However looking that the rest of the build logs the build seems to have 
abruptly terminated part way though so you may well be correct - and the 
restart when no jobs are running may be "restart when I feel like it"  and I 
will probably go back to plugin updated by hand (copy hpi, restart service)

> > is there any known issue in core around this area?
> 
> Generally there are occasional race conditions involving app==null,
> frequently seen during shutdown. It is probably impossible to improve null
> safety here since this API uses the singleton pattern rather than dependency
> injection.


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