FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux johnkrlx.dev.qpass.corp 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
jar does not preserve permissions.  It just uses the umask to create the file permissions.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
mkdir -p /var/tmp/foobar && cd /var/tmp/foobar && touch foo && chmod 675 foo && jar cf foo.jar foo && rm -f foo && jar xf foo.jar&& ls -l

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
-rw-rwxr-x  1 johnkr Develope    0 Jul  1 15:34 foo
-rw-r--r--  1 johnkr Develope  423 Jul  1 15:33 foo.jar
drwxr-xr-x  2 johnkr Develope 4096 Jul  1 15:33 META-INF
ACTUAL -
-rw-r--r--  1 johnkr Develope    0 Jul  1 15:33 foo
-rw-r--r--  1 johnkr Develope  423 Jul  1 15:33 foo.jar
drwxr-xr-x  2 johnkr Develope 4096 Jul  1 15:33 META-INF


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Here's some bash source code:

mkdir -p /var/tmp/foobar && cd /var/tmp/foobar && touch foo && chmod 675 foo && jar cf foo.jar foo && rm -f foo && jar xf foo.jar&& ls -l
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Don't use jar.  Use unzip.