https://bz.apache.org/bugzilla/show_bug.cgi?id=64387
Bug ID: 64387
Summary: Big POIFS stream result in OOM
Product: POI
Version: 4.1.x-dev
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: POIFS
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
In [1] it was noticed, that encrypting huge streams result in OOMs.
This was due to cached ByteBuffers of NIO channels, which were necessary
because of mmap problems in Windows.
I've introduced now a release method, to unmap buffers, which aren't used
anymore. So unmapping makes only sense in stream like handling, where buffers
aren't revisited anymore.
[1]
https://stackoverflow.com/questions/61463301/apache-poi-throwing-oom-error-when-trying-to-password-protect-modest-sized-xlsx
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