during the eclipse shutdown it sometimes happens that the AutoBuildJob
executes code from bundles that already has been shutted down by OSGI
(BundleActivator#stop(...) was called).
In our concrete case we have an IncrementalProjectBuilder that validates
our projects and therefore calls code from other other Plugins. Now it
seems to me that OSGI will shut down regardless if there is an auto
build running an we'll get some exceptions...