Fri Oct 23 2020 02:46:30 UTC
When using your debugger, consider who the bugger was that buggered things up.
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ID Product Comp Assignee Status Resolution Summary Changed
49415 POI HSSF dev RESO DUPL workbook.cloneSheet() throws exception (BeginRecord does not implement clone()) 2010-06-09
One bug found.

as

File a new bug in the "HSSF" component of the "POI" product