https://bz.apache.org/bugzilla/show_bug.cgi?id=62768

--- Comment #2 from Dominik Stadler <dominik.stad...@gmx.at> ---
I am wondering why we even use synchronization here at all. 

Our thread-safety guarantee does not allow to use one workbook/doc/item in more
than one thread at a time anyway. So this synchronization is not really
necessary as we ask our users to perform synchronization at an upper level
anyway, if they want to access documents across different threads...

Having all of POI fully thread-safe would require many many points of
synchronization and would cause a performance penalty for many current
power-users.

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