Created attachment 31352 [details] Patch replacing System.err wit POI standard logs This bug and patch continues what was started with #52628 The file: src/ooxml/java/org/apache/poi/xssf/eventusermodel/XSSFSheetXMLHandler.java logs directly to System.err which is inconvenient for our use case - at work we actually parse docs with shared formulas. I have prepared a patch which is rather trivial. If it needs to be polished - please say so, I will improve it. POI build with the patch I have run the unit tests - there are no regressions introduced.
Thanks for the patch, committed as r1578147.