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Date:      Tue, 17 May 2022 12:34:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 262278] file(1) fails to identify a JAR file
Message-ID:  <bug-262278-227-KhuZUNSZ7k@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-262278-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-262278-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D262278

--- Comment #4 from Michael Osipov <michael.osipov@siemens.com> ---
In contrast:
$ hexdump -C classes/org/apache/maven/SessionScoped.class
00000000  ca fe ba be 00 00 00 34  00 12 07 00 0f 07 00 10  |.......4......=
..|
00000010  07 00 11 01 00 0a 53 6f  75 72 63 65 46 69 6c 65  |......SourceFi=
le|
00000020  01 00 12 53 65 73 73 69  6f 6e 53 63 6f 70 65 64  |...SessionScop=
ed|

Valid JAR:
$ hexdump -C maven-core-4.0.0-alpha-1-SNAPSHOT.jar | head
00000000  50 4b 03 04 0a 00 00 08  00 00 89 41 85 52 00 00  |PK.........A.R=
..|
00000010  00 00 00 00 00 00 00 00  00 00 09 00 00 00 4d 45  |..............=
ME|
00000020  54 41 2d 49 4e 46 2f 50  4b 03 04 14 00 00 08 08  |TA-INF/PK.....=
..|
00000030  00 89 41 85 52 9c ea 73  82 b1 00 00 00 4e 01 00  |..A.R..s.....N=
..|
00000040  00 14 00 00 00 4d 45 54  41 2d 49 4e 46 2f 4d 41  |.....META-INF/=
MA|
00000050  4e 49 46 45 53 54 2e 4d  46 8d 8f d1 0a 82 30 18  |NIFEST.MF.....=
0.|
00000060  85 ef 05 df 61 2f b0 a1  d6 45 78 a7 41 94 60 49  |....a/...Ex.A.=
`I|

I don't know whether I understand the C code from the old Java 7 launcher
correctly, but it is searching for 0xcafe to make it a valid JAR file.

Note: I am Maven PMC member and done a lot on the reproducibility topic.

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