Completely shutdown JXTA without exiting JVM

Hello Jxta Coders,

I am interesting to Completely, on-the-fly shutdown/restart the JXTA 
platform without exiting the running swing application.
My goal is to dynamically reconfigure the Platform using the 
Configurator class and erase everything unter default .jxta dir
I have tryed to stop the default NetPeerGroup using .stopApp(); but 
still some files are locked inside .jxta directory.
Under windows file manager i receive the error : Cannot delete 
discoverySrdi-JxtaPropagateId.idx. It is being used by another person or 
program.
Any suggestions would be appreciated.

Greetings
Bakchos