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  1. Commons Compress
  2. COMPRESS-502

Allow to disable closing files in the finalizer of ZipFile



    • Type: Improvement
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 1.19
    • Fix Version/s: None
    • Component/s: Compressors
    • Labels:


      Apache POI uses commons-compress for handling ZipFiles. We found that it sometimes does some auto-close magic in the finalizer of the ZipFile class with printing out to stderr, see https://gitbox.apache.org/repos/asf?p=commons-compress.git;a=blob;f=src/main/java/org/apache/commons/compress/archivers/zip/ZipFile.java;h=23194560dace91d8052626f3bdc8f765f9c46d7e;hb=HEAD#l652.


      This has some shortcomings:

      • It prints to stderr which many large-scale applications try to avoid by using some logging framework, thus this output might "vanish" unseen in some installations or might cause unexpected side-effects
      • It prevents us from using tools for checking file leaks, e.g. we use https://github.com/kohsuke/file-leak-detector/ heavily for analyzing test-runs for leaked file-handles, but commons-compress prevents this because it "hides" the unclosed file from this functionality
      • The behavior of automatic closing and reporting the problem is non-reproducible because it depends on finalizer/garbage-collection and thus any re-runs or unit-tests usually do not show the same behavior


      There are some fairly simple options to improve this:

      • Allow to disable this functionality via configuration/system-property/...
      • Make this "pluggable" so a logging-framework can be plugged-in or closing can be prevented for certain runs


      I can provide a simple patch if you state which approach you think would make most sense here.



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              • Assignee:
                dominik.stadler@gmx.at Dominik Stadler
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