Hanging pipeline on error #139
Description
A simple pipeline consisting only of a Docker component and a writer hangs indefinitely ("tested" for more than 2 days) on an error showing only "Waiting for threads to finish document processing..."
The input is XMI, this was generated using Python (dkpro-cassis) and then successfully preprocessed using spaCy in DUUI. Using these XMI as input, the next tool (Python-based DUUI tool, multiple, tested) produced this error complaining about invalid XML char in a Lemma annotation (this should not have happened, but this is another issue).
The pipeline should not hang in this case but either stop completely or skip this document. I suspect the error occurs before our pipeline logic (on XMI loading?) and DUUI thus waits forever for the document to finish.