Java Database Connectivity (JDBC)

I have a project that is purely hiebrnate classes and controllers. I exporting it as .jar file.

However, I need it to be connected to a given database url given by the user.

I was thinking on parsing and creating an xml with the given db url. However, I realized that when you compile the project into a .jar the persistance.xml is also placed in this .jar

Given this is there anyway I can set the db url at run time?

thanks !!

I am using
javax.persitance