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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 22967] - <jar> permits duplicated manifest attributes in violation of the manifest specification
Date Mon, 08 Sep 2003 15:48:21 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=22967

<jar> permits duplicated manifest attributes in violation of the manifest specification





------- Additional Comments From jglick@netbeans.org  2003-09-08 15:48 -------
Thanks, failed to find bug #4683 when searching before.

Seems like Java #4842483 is the main justification for leaving the hack in:

http://developer.java.sun.com/developer/bugParade/bugs/4842483.html

However note that the default Manifest parsing code will anyway ignore all but
the last Class-Path attribute. Only an app server (e.g.) which specially
recognizes this problem, and parses an (illegal) manifest itself, could merge
multiple Class-Path headers.

Seems that the extension spec still contradicts the lower-level manifest spec
(and reality) in JDK 1.4.2.

A complicated compromise would be:

1. Forbid (w/ BuildException) any duplicated attributes *except* Class-Path in
the main attrs section, which would be automatically merged (concatenated with
space separators). In the case of the Class-Path exception, log a warning that
the multiple Class-Path scenario while recommended by some documents in fact
contradicts the manifest spec (and doesn't work in the Sun JRE either).

2. Print a warning whenever any attr value (incl. a merged or unmerged
Class-Path) exceeds 512 bytes: continue, and generate a valid manifest based on
it, but warn the user that the Sun JRE might not accept it.

Yucky.

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