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Posted to dev@ant.apache.org by bu...@apache.org on 2004/12/11 14:20:28 UTC
DO NOT REPLY [Bug 32649] New: -
ant-produced jar files don't match those produced by java.util.jar.JarOutputStream
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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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