ProxyPassReverse doesn't work, please help figure out!!

["Chanita Siridechkun" <aireanalistic@xxxxxxxxx>]

Apache 2.2.4 on Fedora core 6
I try to run JVM server on port 7979
it is on local machine at http://localhost:7979
There are http://localhost:7979/profile/login  and others.

Try to use ProxyPassReverse but it doesn't work!!
Here , my configuration.

************
httpd.conf  
************
<IfModule mod_proxy.c>
ProxyRequests On
<Proxy *>
    Order deny,allow
    Allow from all
</Proxy>
</IfModule>


************
mingle.conf
************
ProxyPreserveHost On
ProxyPass /mingle/ http://localhost:7979/
ProxyPassReverse /mingle/ http://localhost:7979/

###At 7979 is running JVM server.
### It should work with configuration above, but it doesnt'.
###So I add Location to make sure. But no difference. T T

<Location "mingle" >
    ProxyPass http://localhost:7979/
    ProxyPassReverse http://localhost:7979/
</Location>

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||Any suggestion. Thanks for your time.||
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Ps. The ProxyPass works well.