code: public static void clearDefaultBusForAnyClassLoader(final Bus bus) {
        synchronized (classLoaderBusses) {
           for (final Iterator<Bus> iterator = classLoaderBusses.values().iterator();
               iterator.hasNext();) {
               Bus itBus = iterator.next();
               if (bus == null || itBus == null|| bus.equals(itBus)) {
                   iterator.remove();
               }
           }
       }
     }
docs: Removes a bus from being the default bus for any classloader
  
  @param bus