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The DefaultNamespaceManager has not been a singleton. Because of this, instances could be removed before the event has been handled completely and therefore the handler could no longer be removed from the queue, resulting in an IllegalStateException. By making the manager a singleton, it is no longer garbage collected and therefore we do not get the exception any longer. Committed-by: Eduard Heimbuch <eduard.heimbuch@cloudogu.com> Co-authored-by: René Pfeuffer <rene.pfeuffer@cloudogu.com>