Reported in KDE as https://bugs.kde.org/show_bug.cgi?id=207517, but this is
indeed a debian/ubuntu bug. There's no reason for
/usr/share/mime/packages/sun-java6-jre.xml to exist, it only redefines what
freedesktop.org.xml already defines, and with another mimetype name.
That file should be removed from the package.
The reason the accuracy is low is that there's a conflict on the *.jar
glob, when both application/java-archive (from packages/sun-
java5-jre.xml) and application/x-java-archive (from freedesktop.org.xml)
are associated with it. So kmimetypefinder doesn't really know which one
to choose. To help deciding that it does mimetype sniffing (looking at
the contents), and that says application/zip - because the magic for jar
files seems wrong/incomplete.
freedesktop.org.xml says
<magic priority="85">
<match value="PK\003\004" type="string" offset="0">
<match value="0xcafe" type="host16" offset="40"/>
</match>
</magic>
but although I see PK\003\004 in all jar files (the zip header), I don't see
0xcafe at offset 40. Does someone know of a proper way to recognize a jar file
from its contents?
Anyway all this seems to come from the missing application/java-archive
alias for application/x-java-archive in freedesktop.org.xml (it should
have been defined as an alias, not as a conflicting glob, in the xml
file...). That mimetype name has NOT been registered to IANA, so in
theory it should have a x- prefix, but well, it seems commonly used that
way so I think I can add it to shared-mime-info.
** Bug watch added: KDE Bug Tracking System #207517
http://bugs.kde.org/show_bug.cgi?id=207517
--
KDE always associates *.jar with the zip mime type
https://bugs.launchpad.net/bugs/309778
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