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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 32649] New: - ant-produced jar files don't match those produced by java.util.jar.JarOutputStream
Date Sat, 11 Dec 2004 13:20:28 GMT
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http://issues.apache.org/bugzilla/show_bug.cgi?id=32649

           Summary: ant-produced jar files don't match those produced by
                    java.util.jar.JarOutputStream
           Product: Ant
           Version: 1.6.2
          Platform: PC
        OS/Version: SunOS
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Core tasks
        AssignedTo: dev@ant.apache.org
        ReportedBy: dp@eng.sun.com


ant seems to produce jar files which are exactly zip files.  However, Sun's jar
utility seems to produce jar files with a special 0xcafe tag.  The Solaris
kernel uses this tag to help determine if a jar file should be executable.  For
example, a jar created using jar(1) can be run:

$ chmod a+x hello.jar
$ ./hello.jar
Hello, World!

Whereas the same jar, produced by ant, cannot be.  The difference seems
to come just after the initial MANIFEST declaration:

/usr/bin/jar:
0000000: 504b 0304 1400 0800 0800 7c23 8b31 0000  PK........|#.1..
0000010: 0000 0000 0000 0000 0000 0900 0400 4d45  ..............ME
0000020: 5441 2d49 4e46 2ffe ca00 0003 0050 4b07  TA-INF/......PK.
                          ^^^^^ 0xcafe

ant:
0000000: 504b 0304 0a00 0000 0000 0c25 8b31 0000  PK.........%.1..
0000010: 0000 0000 0000 0000 0000 0900 0000 4d45  ..............ME
0000020: 5441 2d49 4e46 2f50 4b03 0414 0008 0008  TA-INF/PK.......
                          ^^^^^ 'PK'

A frustrating part of this is that Sun's JAR file page doesn't mention
this behavior.  Since I work for Sun, I'll file a bug on that, and see
if I can get the java team to better document this behavior.

I also found this page, which might help (see putNextEntry()):

http://www.javaresearch.org:88/source/jdk142/java/util/jar/JarOutputStream.java.html

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