JXTA_HOME and autoconfig

Hi,
can I set the JXTA_HOME within my application? Reason: I use extLib and 
the Configurator in order to automatically generate a Jxta 
PlatformConfig file before the Jxta system comes up. My software tries 
to find a place for the jxta home (users home dir, tmp dir, etc) and 
stores the file there (App. is run from CD so I can not store it there). 
When the Jxta part initializes, it uses JXTA_HOME env. or .jxta in the 
application dir, so it does not use my generated config, of course. I 
also found a Config class, where this information is fixed (static 
final) and moreover it is depreciated.
What is the way I have to do, without modifying the original classes?

thanks for the help


Matthias