https://issues.apache.org/bugzilla/show_bug.cgi?id=52233
--- Comment #1 from Dominik Stadler <dominik.stad...@gmx.at> ---
Analysis:
Class ColumnHelper has a member worksheet of type CTWorksheetImpl. If I look at
it before and after the call to write(), there is a line " <main:cols/>"
missing after writing, so it seems writing is removing this line somehow.
When looking more closely the onSave() call in XSSFWorkbook.write() invokes
XSSFSheet.write(), which causes the removal via
worksheet.setColsArray(null);
I am not sure why the setColsArray() is done here and if not doing this would
have side-effects, but it would solve the problem here and probably some others
that are reported in some other Bugs when users try using a Workbook after
writing it out once.
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