title: Override Java properties from packages
body: <p>I am using several packages which are configured by using configuration properties for example org.apache.ws.security.crypto. Normally a single configuration file suffices but I now have a need to override one or more of the properties whenever they are used by code which is called from a particular object instance. 
  I am far from a java expert (but have way too many years of programming experience to mention) so any specific guidence for a solution will be greatly appreciated.</p>