FULL PRODUCT VERSION :
java version "1.6.0_30"
Java(TM) SE Runtime Environment (build 1.6.0_30-b12)
Java HotSpot(TM) Client VM (build 20.5-b03, mixed mode, sharing)

or

java version "1.7.0_01"
Java(TM) SE Runtime Environment (build 1.7.0_01-b08)
Java HotSpot(TM) Client VM (build 21.1-b02, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.0.6002]

EXTRA RELEVANT SYSTEM CONFIGURATION :
The relevant classes are in the network

A DESCRIPTION OF THE PROBLEM :
Until version 1.6._05 it was possible use the UNC paths for C parameter, if jar.exe was with the options-cfmv called.
Currently it is not possible (with 1.7.0_01 or 1.6.0_30 tested )
It appears the error message "File or directory does not exist." This is a "/" less is shown in path

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Store the class files in the network
2. UNC paths notice
3. Manifest file get
The jar tool called with UNC path

An call example:
jar -cfmv \\fs06\releases\T00PA-test\test-2010-04-20.jar C:\1\se-manifest6092122578565208959.mf -C \\fs06\releases\V5\AD00\sem\classes com\cisag\pgm -C \\fs06\releases\V5\AD00\sem\classes com\cisag\sys

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
All class files amd manifest are in jar file
ACTUAL -
Error message, No class files in jar file

ERROR MESSAGES/STACK TRACES THAT OCCUR :
 "File or directory does not exist."

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
No source code. Tool call (jar.exe)
---------- END SOURCE ----------