[Bug 262278] file(1) fails to identify a JAR file

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 01 Mar 2022 18:39:29 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262278

Ed Maste <emaste@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |emaste@freebsd.org

--- Comment #1 from Ed Maste <emaste@freebsd.org> ---
JAR files are in fact ZIP files, just with special metadata. libmagic's JAR
detection was added here:
https://github.com/file/file/commit/e45cd303713418af058361f5711a768550e1c867

JAR files often have 0xcafe at a specific location in the ZIP file and libmagic
keys on this, but it is not required, and the file you've linked does not have
this field.

Useful links:
https://bugs.java.com/bugdatabase/view_bug.do?bug_id=6211008
https://bugs.openjdk.java.net/browse/JDK-6808540

This should probably be reported/discussed at http://www.darwinsys.com/file/

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