Github user kaspersorensen commented on the pull request:
https://github.com/apache/metamodel/pull/56#issuecomment-145488372
OK we finally figured out that the issue was with
HSSFWorkbook.write(OutputStream). Please check the bug that we registered in
POI: https://bz.apache.org/bugzilla/show_bug.cgi?id=58480
For now we have a crude workaround which involves invoking System.gc() and
sleeping for 800 ms. Not ideal at all. But seems to do the trick.
Justification for keeping this workaround would be that it _only_ applies
to "old" Excel .xls documents and it only applies when appending/updating
workbooks, not when creating new ones.
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